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Double Rifles, Single Shots & Combinations >> Double Rifles

470Rigby
.333 member

Reged: 23/02/04
Posts: 328
Loc: Melbourne, Australia

Re:Woodward .450/400 3.25" & British proof marks
04/01/05 03:44 PM

CptCrl,

Unfortunately, these old British rifles can produce different ballistics, due to sometimes considerable variations in bore size and effective freebore, which can be different in each barrel in doubles due to bore and throat erosion.

Accordingly, the "guide books" can sometimes only provide a starting point.

For example, Graeme Wright (Shooting the British Double Rifle) gives an 83-gr load with IMR 4831 as developing a MV of 2070 fps which should be right on the money! But I have used an 80-gr load with that powder that regulated beautifully but gave an extra 100 fps of MV (2170 fps)!

First things I would do are;

* Slug both bores for actual bore dimensions(once you know that, you could cast around for pills that may be a better match for your rifle?)

* Chronograph both barrels to see if they are producing MV's in the same range. If there is a discrepancy it could be due to different bore sizes and/or freebore, but knowing this will help with deciding on your next move if it is still x-firing.

If the problem persists, perhaps you could report back on the bore and chronograph readings? The issues involved are far too complex to canvass here, however you could read Chapter 10 in Graeme's book for an outine of some of the problems he has had to deal with in achieving regulation.

One final thought. It can't be just assumed that if you seat the bullet to the same overall cartridge length as original rounds that everything will be "hunky dory"! As a last resort, you should try different bullet seating depths.

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Subject	Posted by	Posted on
Woodward .450/400 3.25" & British proof marks	CptCurl	18/12/04 02:30 PM
Re: Woodward .450/400 3.25" & British proof marks	CptCurl	30/12/04 02:47 PM
Re: Woodward .450/400 3.25" & British proof marks	NitroX	30/12/04 03:26 PM
Re: Woodward .450/400 3.25" & British proof marks	mehulkamdar	24/12/04 04:47 AM
Re: Woodward .450/400 3.25" & British proof marks	CptCurl	24/12/04 05:34 AM
Re: Woodward .450/400 3.25" & British proof marks	Morten	24/12/04 07:49 AM
Re: Woodward .450/400 3.25" & British proof marks	CptCurl	24/12/04 08:09 AM
Re: Woodward .450/400 3.25" & British proof marks	Morten	24/12/04 08:24 AM
Re: Woodward .450/400 3.25" & British proof marks	mehulkamdar	25/12/04 11:08 AM
Re: Woodward .450/400 3.25" & British proof marks	Morten	28/12/04 12:06 AM
Re: Woodward .450/400 3.25" & British proof marks	mehulkamdar	29/12/04 05:53 AM
Re: Woodward .450/400 3.25" & British proof marks	4seventy	25/12/04 01:16 PM
Re: Woodward .450/400 3.25" & British proof marks	mehulkamdar	26/12/04 07:15 AM
Re: Woodward .450/400 3.25" & British proof marks	4seventy	26/12/04 09:36 AM
Re: Woodward .450/400 3.25" & British proof marks	mehulkamdar	29/12/04 05:50 AM
Re:Woodward .450/400 3.25" & British proof marks	470Rigby	19/12/04 12:13 AM
Re:Woodward .450/400 3.25" & British proof marks	400NitroExpress	18/12/04 05:07 PM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	17/12/07 12:57 PM
Re:Woodward .450/400 3.25" & British proof marks	Anonymous	17/12/07 01:02 PM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	17/12/07 10:20 PM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	17/12/07 10:26 PM
Re:Woodward .450/400 3.25" & British proof marks	NE450No2	17/12/07 10:56 PM
Re:Woodward .450/400 3.25" & British proof marks	cadet	19/12/07 02:25 PM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	19/12/07 10:33 PM
Re:Woodward .450/400 3.25" & British proof marks	Nakihunter	17/12/07 02:05 PM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	17/12/07 09:56 PM
Re:Woodward .450/400 3.25" & British proof marks	Rusty	19/12/04 06:41 AM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	19/12/04 02:33 PM
Re:Woodward .450/400 3.25" & British proof marks	Rusty	20/12/04 12:48 AM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	21/12/04 10:36 AM
Re:Woodward .450/400 3.25" & British proof marks	NitroX	22/12/04 03:46 AM
Re:Woodward .450/400 3.25" & British proof marks	400NitroExpress	21/12/04 03:50 PM
Re:Woodward .450/400 3.25" & British proof marks	470Rigby	19/12/04 05:51 PM
Re:Woodward .450/400 3.25" & British proof marks	400NitroExpress	19/12/04 04:28 PM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	22/12/04 03:05 PM
Re:Woodward .450/400 3.25" & British proof marks	470Rigby	23/12/04 02:38 PM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	23/12/04 03:54 PM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	23/12/04 03:45 PM
Re:Woodward .450/400 3.25" & British proof marks	470Rigby	23/12/04 05:19 PM
Re:Woodward .450/400 3.25" & British proof marks	Velopex	30/12/04 07:36 PM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	31/12/04 09:31 AM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	04/01/05 02:03 PM
Re:Woodward .450/400 3.25" & British proof marks	470Rigby	04/01/05 03:44 PM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	05/01/05 12:20 AM
Re:Woodward .450/400 3.25" & British proof marks	NE450No2	05/02/05 02:43 PM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	06/02/05 12:18 AM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	06/02/05 01:14 AM
Re:Woodward .450/400 3.25" & British proof marks	470Rigby	06/01/05 12:09 AM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	06/01/05 01:06 AM
Re:Woodward .450/400 3.25" & British proof marks	NitroX	01/02/05 05:54 PM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	01/02/05 11:16 PM
Re:Woodward .450/400 3.25" & British proof marks	Morten	31/12/04 06:29 AM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	24/12/04 01:40 AM
Re:Woodward .450/400 3.25" & British proof marks	webley	22/12/04 07:31 PM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	23/12/04 12:13 AM
Re:Woodward .450/400 3.25" & British proof marks	400NitroExpress	23/12/04 03:55 AM
Re:Woodward .450/400 3.25" & British proof marks	CptCurl	23/12/04 06:59 AM
Re:Woodward .450/400 3.25" & British proof marks	NE450No2	22/12/04 05:51 PM
Re:Woodward .450/400 3.25" & British proof marks	4seventy	19/12/04 02:45 PM
Re:Woodward .450/400 3.25" & British proof marks	4seventy	18/12/04 03:04 PM

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