Forums.NitroExpress.com

Home | Ezine | Forums | Links | Contact NitroExpress.com: 20 ga DR build progress.

View recent messages : 24 hours | 48 hours | 7 days | 14 days | 30 days | 60 days | More Smilies

*** Enjoy NitroExpress.com? Participate and join in. ***

You are not logged in. [Login]

Main Index · Search · Active Topics
New user · Who's Online · FAQ · Calendar

Double Rifles, Single Shots & Combinations >> Paradox and Bore Guns

DarylS
.700 member

Reged: 10/08/05
Posts: 26504
Loc: Beautiful British Columbia, Ca...

Re: 20 ga DR build progress.
28/06/10 11:56 PM

A little history, hope you don't mind.

As .615" are the 'bore diameters, ie: tops of the land to land dimension, they are true 20 bore barrels as 20 bore is .615" which equates to a pure lead ball of 350gr. at that diameter. 7000gr. divided by 20 (bore) = 350gr. which happens to be .615" in diameter.

Most European and some English ctg. are named for the bore size ie: 256 Dutch Man. (6.5 groove), .276 Mauser (.284 groove), .303 British (bore size), .350 Rigby (bore size).375 Axite and H&H -(groove diameter). Naming by bore dsize was a hold-over from naming by bore size back in the muzzleloading era. A .45 cal. rifle could have .008" to .025",. yet was still called a .45, not a .466 cal.(.450 with .008" rifling) nor a .50 cal. (.450 + .025" rifling) because a .450" ball was the bore size.

The American method was naming ctgs. by either bore size or groove size - rather sloppily at that, ie: .308 Winchester (groove), .300 Savage(bore), .300 magnum (Bore), .375's(groove), .358's, .450 Watts (bore) and .450 Lott(bore) .458 magnum (groove)

Bore diameter was that size and weight of round ball that would just fit in the bore - a 12 bore rifle (nominally .729/.730" bore @ 583.3gr. ball ) could have up to a .750" groove diameter for .010" rifling.

Back in the patched round ball era with muzzleloaders, a 12 bore shot a 13 bore ball to make room for a 'substancial patch", a 14 bore would shoot a 15 ball, etc, so a 4 would shoot a 5 bore ball.

With breechloaders and rifled barrels shot without cloth patches and not having to have undersized projectiles, they were able to go the other way - all gauges would shoot balls that were groove diameter - so a .010" rifling depth 12 bore would shoot an 11 ball, ie: .750" or with shallower rifling, whatever size fit the grooves, sometimes to the bottom, but often only partically engraved still shot just fine.

Thus, we must slug our barrels to ensure we aren't shooting projeciles too large. A bit too small doesn't hurt the rifling in low volume shooting & can be accurate, however a hard ball (round or elongated) that is larger than groove diameter could if shot in thin barrels.

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

Post Extras

Print Post

Remind Me!

Notify Moderator

Entire topic
Subject	Posted by	Posted on
20 ga DR build progress.	nitro450exp	16/06/10 03:38 AM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	nitro450exp	07/11/12 10:03 AM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	tinker	07/11/12 01:36 PM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	DarylS	07/11/12 02:19 PM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	kamilaroi	07/11/12 04:56 PM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	nitro450exp	12/11/12 11:20 AM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	DUGABOY1	07/02/14 03:44 PM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	DarylS	07/02/14 06:33 PM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	rigbymauser	08/02/14 03:31 AM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	nitro450exp	08/02/14 06:30 AM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	nitro450exp	01/06/14 11:36 AM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	DarylS	02/06/14 01:20 AM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	Sarg	01/06/14 12:38 PM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	tinker	01/06/14 12:47 PM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	Sarg	02/06/14 08:13 AM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	tinker	02/06/14 11:53 AM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	nitro450exp	17/12/14 12:23 PM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	nitro450exp	04/08/17 07:57 PM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	nitro450exp	17/11/17 10:54 PM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	DarylS	18/11/17 04:58 AM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	Waidmannsheil	18/11/17 05:44 AM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	nitro450exp	19/11/17 12:21 PM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	DarylS	20/11/17 04:11 AM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	93x64mm	20/11/17 08:04 AM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	nitro450exp	20/11/17 08:23 AM
Re: 20 ga DR, WE ARE DONE !!!!!!!!!!!!!!	Sville	01/06/14 11:53 PM
Re: 20 ga DR build progress.	nitro450exp	17/06/10 04:36 AM
Re: 20 ga DR build progress.	bonanza	17/06/10 11:54 PM
Re: 20 ga DR build progress.	nitro450exp	18/06/10 01:52 AM
Re: 20 ga DR build progress.	DarylS	19/06/10 12:57 AM
Re: 20 ga DR build progress.	nitro450exp	19/06/10 02:40 AM
Re: 20 ga DR build progress.	Birdhunter50	19/06/10 10:11 AM
Re: 20 ga DR build progress.	Al_in_Mi	20/06/10 05:23 PM
Re: 20 ga DR build progress.	nitro450exp	21/06/10 01:20 AM
Re: 20 ga DR build progress.	DarylS	21/06/10 08:08 AM
Re: 20 ga DR build progress.	nitro450exp	22/06/10 12:53 AM
Re: 20 ga DR build progress.	DarylS	23/06/10 12:28 AM
Re: 20 ga DR build progress.	nitro450exp	23/06/10 02:29 AM
Re: 20 ga DR build progress.	tinker	23/06/10 07:23 AM
Re: 20 ga DR build progress.	nitro450exp	23/06/10 10:46 PM
Re: 20 ga DR build progress.	DarylS	23/06/10 11:20 PM
Re: 20 ga DR build progress.	nitro450exp	23/06/10 11:58 PM
Re: 20 ga DR build progress.	DarylS	24/06/10 12:25 PM
Re: 20 ga DR build progress.	nitro450exp	26/06/10 01:55 AM
Re: 20 ga DR build progress.	nitro450exp	26/06/10 10:25 AM
Re: 20 ga DR build progress.	BigFiveJack	26/06/10 01:46 PM
Re: 20 ga DR build progress.	nitro450exp	28/06/10 03:24 AM
Re: 20 ga DR build progress.	DarylS	28/06/10 09:15 AM
Re: 20 ga DR build progress.	nitro450exp	28/06/10 10:22 PM
Re: 20 ga DR build progress.	DarylS	28/06/10 11:56 PM
Re: 20 ga DR build progress.	Tallchief	15/09/10 11:39 PM
Re: 20 ga DR build progress.	nitro450exp	16/09/10 12:02 AM
Re: 20 ga DR build progress.	Tallchief	16/09/10 01:06 AM
Re: 20 ga DR build progress.	Tallchief	16/09/10 02:06 AM
Re: 20 ga DR build progress.	nitro450exp	28/09/10 02:07 AM
Re: 20 ga DR build progress.	DarylS	28/09/10 09:10 AM
Re: 20 ga DR build progress.	Tallchief	29/09/10 11:40 AM
Re: 20 ga DR build progress.	DarylS	30/09/10 01:26 AM
Re: 20 ga DR build progress.	nitro450exp	30/09/10 02:00 AM
Re: 20 ga DR build progress.	tinker	30/09/10 06:32 AM
Re: 20 ga DR build progress.	Tallchief	30/09/10 09:12 AM
Re: 20 ga DR build progress.	DarylS	01/10/10 02:07 AM
Re: 20 ga DR build progress.	nitro450exp	01/10/10 05:15 AM
Re: 20 ga DR build progress.	DarylS	02/10/10 12:29 PM
Re: 20 ga DR build progress.	Tallchief	03/10/10 12:21 AM
Re: 20 ga DR build progress.	DarylS	03/10/10 12:41 AM
Re: 20 ga DR build progress.	Tallchief	03/10/10 01:22 AM
Re: 20 ga DR build progress.	apr1775	04/10/10 10:42 PM
Re: 20 ga DR build progress.	DarylS	05/10/10 02:11 AM
Re: 20 ga DR build progress.	Tallchief	05/10/10 10:25 AM
Re: 20 ga DR build progress.	Tallchief	06/10/10 10:33 AM
Re: 20 ga DR build progress.	DarylS	06/10/10 08:52 PM
Re: 20 ga DR build progress.	Tallchief	06/10/10 10:44 PM
Re: 20 ga DR build progress.	DarylS	07/10/10 03:10 AM
Re: 20 ga DR build progress.	DarylS	07/10/10 05:40 AM
Re: 20 ga DR build progress.	Tallchief	07/10/10 10:07 AM
Re: 20 ga DR build progress.	DarylS	07/10/10 11:09 AM
Re: 20 ga DR build progress.	Tallchief	07/10/10 11:17 AM
Re: 20 ga DR build progress.	DarylS	08/10/10 02:05 AM
Re: 20 ga DR build progress.	nitro450exp	27/10/10 11:19 PM
Re: 20 ga DR build progress.	Tallchief	29/10/10 12:46 PM
Re: 20 ga DR build progress.	nitro450exp	09/11/10 02:05 AM
Re: 20 ga DR build progress.	DarylS	09/11/10 02:13 AM
Re: 20 ga DR build progress.	nitro450exp	09/11/10 03:26 AM
Re: 20 ga DR build progress.	GroovyMike	10/11/10 12:01 AM
Re: 20 ga DR build progress.	Tallchief	28/11/10 03:19 AM
Re: 20 ga DR build progress.	nitro450exp	14/02/11 09:08 AM
Re: 20 ga DR build progress.	nitro450exp	20/02/11 01:26 PM
Re: 20 ga DR build progress.	nitro450exp	24/02/11 08:15 AM
Re: 20 ga DR build progress.	4seventy	24/02/11 08:19 AM
Re: 20 ga DR build progress.	DarylS	24/02/11 12:03 PM
Re: 20 ga DR build progress.	nitro450exp	26/02/11 12:23 AM
Re: 20 ga DR build progress.	DarylS	26/02/11 03:01 AM
Re: 20 ga DR build progress.	nitro450exp	03/03/11 12:53 AM
Re: 20 ga DR build progress.	DarylS	03/03/11 02:43 AM
Re: 20 ga DR build progress.	Sarg	03/03/11 11:11 AM
Re: 20 ga DR build progress.	nitro450exp	07/03/11 05:08 AM
Re: 20 ga DR build progress.	NitroX	03/04/11 02:07 AM
Re: 20 ga DR build progress.	DarylS	03/04/11 02:20 AM
Re: 20 ga DR build progress.	nitro450exp	03/04/11 03:38 AM
Re: 20 ga DR build progress.	nitro450exp	13/05/11 10:05 AM
Re: 20 ga DR build progress.	CHAPUISARMES	13/05/11 11:20 AM
Re: 20 ga DR build progress.	DarylS	13/05/11 11:48 AM
Re: 20 ga DR build progress.	nitro450exp	20/05/11 10:51 PM
Re: 20 ga DR build progress.	nitro450exp	09/06/11 12:34 PM
Re: 20 ga DR build progress.	bwanabobftw	13/06/11 10:02 PM
Re: 20 ga DR build progress.	nitro450exp	22/06/11 11:29 AM
Re: 20 ga DR build progress.	CHAPUISARMES	22/06/11 11:48 AM
Re: 20 ga DR build progress.	DarylS	23/06/11 12:57 AM
Re: 20 ga DR build progress.	nitro450exp	23/06/11 04:31 AM
Re: 20 ga DR build progress.	tinker	23/06/11 05:34 AM
Re: 20 ga DR build progress.	nitro450exp	23/06/11 11:12 PM
Re: 20 ga DR build progress.	nitro450exp	24/06/11 09:31 AM
Re: 20 ga DR build progress.	DarylS	25/06/11 02:15 AM
Re: 20 ga DR build progress.	nitro450exp	25/06/11 11:48 AM
Re: 20 ga DR build progress.	nitro450exp	07/07/11 12:31 PM
Re: 20 ga DR build progress.	Tom_H	08/07/11 04:48 AM
Re: 20 ga DR build progress.	nitro450exp	08/07/11 08:44 AM
Re: 20 ga DR build progress.	DarylS	08/07/11 11:05 AM
Re: 20 ga DR build progress.	tinker	08/07/11 03:12 PM
Re: 20 ga DR build progress.	nitro450exp	16/07/11 08:55 AM
Re: 20 ga DR build progress.	DarylS	17/07/11 04:22 AM
Re: 20 ga DR build progress.	nitro450exp	18/07/11 11:49 AM
Re: 20 ga DR build progress.	nitro450exp	19/07/11 12:04 PM
Re: 20 ga DR build progress.	CHAPUISARMES	20/07/11 12:04 PM
Re: 20 ga DR build progress.	DarylS	21/07/11 02:08 AM
Re: 20 ga DR build progress.	nitro450exp	16/08/11 10:40 AM
Re: 20 ga DR build progress.	DarylS	17/08/11 01:34 AM
Re: 20 ga DR build progress.	nitro450exp	13/09/11 11:56 AM
Re: 20 ga DR build progress.	DarylS	13/09/11 01:21 PM
Re: 20 ga DR build progress.	nitro450exp	21/09/11 11:05 AM
Re: 20 ga DR build progress.	DarylS	22/09/11 03:16 AM
Re: 20 ga DR build progress.	nitro450exp	12/10/11 01:51 PM
Re: 20 ga DR build progress.	CHAPUISARMES	12/10/11 01:58 PM
Re: 20 ga DR build progress.	bwanabobftw	14/10/11 12:32 AM
Re: 20 ga DR build progress.	DarylS	14/10/11 01:16 AM
Re: 20 ga DR build progress.	nitro450exp	18/10/11 05:36 PM
Re: 20 ga DR build progress.	tinker	19/10/11 01:52 PM
Re: 20 ga DR build progress.	kamilaroi	19/10/11 03:34 PM
Re: 20 ga DR build progress.	nitro450exp	25/10/11 03:56 AM
Re: 20 ga DR build progress.	DarylS	25/10/11 05:29 AM
Re: 20 ga DR build progress.	nitro450exp	25/10/11 06:06 AM
Re: 20 ga DR build progress.	nitro450exp	25/10/11 06:12 AM
Re: 20 ga DR build progress.	Supercracker	25/10/11 07:53 AM
Re: 20 ga DR build progress.	nitro450exp	08/11/11 01:31 AM
Re: 20 ga DR build progress.	DarylS	08/11/11 03:05 AM
Re: 20 ga DR build progress.	nitro450exp	08/11/11 12:24 PM
Re: 20 ga DR build progress.	nitro450exp	20/11/11 01:05 PM
Re: 20 ga DR build progress.	DarylS	20/03/12 05:58 AM
Re: 20 ga DR build progress.	nitro450exp	20/03/12 07:19 AM
Re: 20 ga DR build progress.	nitro450exp	02/04/12 12:44 PM
Re: 20 ga DR build progress.	tinker	02/04/12 02:02 PM
Re: 20 ga DR build progress.	nitro450exp	02/04/12 10:38 PM
Re: 20 ga DR build progress.	DarylS	03/04/12 01:28 AM
Re: 20 ga DR build progress.	tinker	03/04/12 03:30 AM
Re: 20 ga DR build progress.	nitro450exp	04/04/12 05:46 AM
Re: 20 ga DR build progress.	nitro450exp	06/07/12 06:34 AM
Re: 20 ga DR build progress.	DarylS	06/07/12 08:31 AM
Re: 20 ga DR build progress.	nitro450exp	06/07/12 10:52 AM
Re: 20 ga DR build progress.	DarylS	07/07/12 01:52 AM
Re: 20 ga DR build progress.	nitro450exp	25/08/12 01:47 AM
Re: 20 ga DR build progress.	tinker	28/08/12 12:57 AM
Re: 20 ga DR build progress.	nitro450exp	01/09/12 12:56 AM
Re: 20 ga DR build progress.	nitro450exp	18/09/12 03:12 AM
Re: 20 ga DR build progress.	tinker	18/09/12 03:27 AM
Re: 20 ga DR build progress.	nitro450exp	25/09/12 10:29 AM
Re: 20 ga DR build progress.	nitro450exp	22/10/12 11:24 PM
Re: 20 ga DR build progress.	DarylS	23/10/12 01:23 AM
Re: 20 ga DR build progress.	Sniper	23/10/12 10:05 PM
Re: 20 ga DR build progress.	nitro450exp	24/10/12 11:50 PM
Re: 20 ga DR build progress.	DarylS	18/09/12 03:26 AM
Re: 20 ga DR build progress.	CHAPUISARMES	20/11/11 01:18 PM
Re: 20 ga DR build progress.	nitro450exp	26/11/11 02:32 PM
Re: 20 ga DR build progress.	tinker	26/11/11 02:45 PM
Re: 20 ga DR build progress.	nitro450exp	26/11/11 03:44 PM
Re: 20 ga DR build progress.	DarylS	27/11/11 08:57 AM
Re: 20 ga DR build progress.	nitro450exp	05/12/11 05:25 AM
Re: 20 ga DR build progress.	nitro450exp	06/12/11 11:31 AM
Re: 20 ga DR build progress.	Tom_H	08/12/11 12:03 PM
Re: 20 ga DR build progress.	Tom_H	08/12/11 12:11 PM
Re: 20 ga DR build progress.	500grains	08/12/11 01:45 PM
Re: 20 ga DR build progress.	DarylS	08/12/11 01:57 PM
Re: 20 ga DR build progress.	nitro450exp	10/12/11 02:56 AM
Re: 20 ga DR build progress.	DarylS	10/12/11 05:05 AM
Re: 20 ga DR build progress.	nitro450exp	18/01/12 12:51 PM
Re: 20 ga DR build progress.	tinker	18/01/12 01:25 PM
Re: 20 ga DR build progress.	DarylS	19/01/12 04:17 AM
Re: 20 ga DR build progress.	nitro450exp	19/01/12 09:50 AM
Re: 20 ga DR build progress.	nitro450exp	20/03/12 04:54 AM
Re: 20 ga DR build progress.	tinker	20/03/12 05:29 AM
Re: 20 ga DR build progress.	Supercracker	25/10/11 06:02 AM
Re: 20 ga DR build progress.	Tom_H	17/07/11 04:20 AM
Re: 20 ga DR build progress.	tinker	22/06/11 11:46 AM
Re: 20 ga DR build progress.	nitro450exp	03/04/11 01:47 AM
Re: 20 ga DR build progress.	Tallchief	02/10/10 10:23 AM
Re: 20 ga DR build progress.	DarylS	17/09/10 08:41 AM
Re: 20 ga DR build progress.	nitro450exp	29/06/10 02:27 AM
Re: 20 ga DR build progress.	DarylS	30/06/10 01:08 AM
Re: 20 ga DR build progress.	nitro450exp	30/06/10 02:59 AM
Re: 20 ga DR build progress.	Tom_H	04/07/10 01:40 PM
Re: 20 ga DR build progress.	jaz	04/07/10 08:38 PM
Re: 20 ga DR build progress.	nitro450exp	05/07/10 08:13 AM
Re: 20 ga DR build progress.	nitro450exp	15/07/10 03:11 AM
Re: 20 ga DR build progress.	nitro450exp	22/07/10 03:49 AM
Re: 20 ga DR build progress.	DarylS	22/07/10 03:21 PM
Re: 20 ga DR build progress.	nitro450exp	28/07/10 02:31 AM
Re: 20 ga DR build progress.	nitro450exp	12/08/10 10:53 PM
Re: 20 ga DR build progress.	nitro450exp	17/08/10 06:41 AM
Re: 20 ga DR build progress.	DarylS	18/08/10 12:11 AM
Re: 20 ga DR build progress.	nitro450exp	18/08/10 01:00 AM
Re: 20 ga DR build progress.	tinker	18/08/10 02:49 AM
Re: 20 ga DR build progress.	nitro450exp	18/08/10 03:29 AM
Re: 20 ga DR build progress.	DarylS	20/08/10 03:09 AM
Re: 20 ga DR build progress.	nitro450exp	20/08/10 10:34 PM
Re: 20 ga DR build progress.	DarylS	20/08/10 11:56 PM
Re: 20 ga DR build progress.	nitro450exp	08/09/10 12:27 AM
Re: 20 ga DR build progress.	DarylS	08/09/10 06:42 AM

Extra information

0 registered and 12 anonymous users are browsing this forum.

Moderator: tinker

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled

Rating:
Thread views: 160616

Jump to

NitroExpress.com

Powered by UBB.threads™ 6.5.5

Home | Ezine | Forums | Links | Contact

Copyright 2003 to 2011 - all rights reserved