Home | Ezine | Forums | Links | Contact
NitroExpress.com: .303 Improved for a Dbl rifle on shotgun action

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 >> Building Double Rifles & Gunsmithing
Previous topic Previous   View all topics Index   Next topic Next   Threaded Mode Threaded  

Pages: 1
Brithunter
.300 member


Reged: 17/03/10
Posts: 184
Loc: Lincolnshire, England
.303 Improved for a Dbl rifle on shotgun action
      #195078 - 28/11/11 09:04 AM

Have been thinking...................... which is a bad idea I know.

Now after reading Ron's post on his 303 build and reading some other posts on other builds it sort of came to me if the Back thrust against the standing breech is a bit of a worry why could not an Improved case be used as one of the advantages it's claimed for an Improved cases is reduced back thrust due to the case shape gripping the chamber wall better.

Some thing like the one on the right:-


It's not quite what I asked for as I asked for a .303 Epps and this is not that. The neck is too short.

Just wondering how it would be in a nice Double rifle

--------------------
Don't let the bastards grind you down!

Edited by CptCurl (28/11/11 12:32 PM)

Post Extras: Print Post   Remind Me!   Notify Moderator  
500Nitro
.450 member


Reged: 06/01/03
Posts: 7244
Loc: Victoria, Australia
Re: .303 Improved for a Dbl rifle on shotgun action [Re: Brithunter]
      #195079 - 28/11/11 09:11 AM


Why not use 375 2 1/2 ammo and .308 bullets ?


Or, at least use .308 bullets, it gives a wider selection
which although in a DR can still be utilized.

Just my HO.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Rule303
.450 member


Reged: 05/07/09
Posts: 5061
Loc: Woodford Qld
Re: .303 Improved for a Dbl rifle on shotgun action [Re: Brithunter]
      #195087 - 28/11/11 10:12 AM

Brithunter I like your thoughts.

Like you I would want a slightly longer neck.

Post Extras: Print Post   Remind Me!   Notify Moderator  
DarylS
.700 member


Reged: 10/08/05
Posts: 26992
Loc: Beautiful British Columbia, Ca...
Re: .303 Improved for a Dbl rifle on shotgun action [Re: Rule303]
      #195101 - 28/11/11 11:17 AM

The improved cases will certainly allow higher pressures than a tapered case in most actions, due to the lowered rearward thrust. Excessive pressure for the round is at a higher level - however.

That's a big however, I think. In Ron's guns, the BRNO action seemed to be up to normal or almost normal pressures as he had his ammo loaded, thus they could be improved upon safely, if the barrels, were properly hardened and tempered and stress relieved after rifling in 4140 or 4150 - or whatever is good barrel steel.

If the action used, is not up to the normal 44,000 CUP of the standard case, a straight walled case isn't going to allow higher pressures, if you get my drift.

In the bolt actioned military .303 rifle, it is the action's springiness that limits pressure. In a stronger action, ie: Ruger #1, or other bolt gun like a front lug P-14 or #4 Enfield, the factory ballistics can be improved up, slightly before the case backs up against the bolt or breech face and says "ENOUGH"! Under THESE circumstances, considerable gains can be made using an improved case, ie: lmited taper case.

I agree the neck is shorter than I'd like, as well.

Just where the shotgun action fits in all this, is up to the guy making the rifle and making the CORRECT decisions. I'd think standard SAAMI or CIP specs would work for me in a DR.

Did you know you can sized spent .303 brass, trim to length, slean inside and out, trim off the rim, fill with lead and shoot them in your .457 or .458 rifle?

John Buhmiller used to call them his "mouse hole makers".

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


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

Post Extras: Print Post   Remind Me!   Notify Moderator  
CptCurlAdministrator
.450 member


Reged: 01/05/04
Posts: 5284
Loc: Fincastle, Botetourt County, V...
Re: .303 Improved for a Dbl rifle on shotgun action [Re: DarylS]
      #195107 - 28/11/11 12:33 PM

I think if I were inclined toward something like this, I would go for the .30R Blaser.

But my choice would be to stick with the .303 Brit.

Curl

--------------------
RoscoeStephenson.com

YOUR DOUBLE RIFLE IS YOUR BEST FRIEND.



Post Extras: Print Post   Remind Me!   Notify Moderator  
Brithunter
.300 member


Reged: 17/03/10
Posts: 184
Loc: Lincolnshire, England
Re: .303 Improved for a Dbl rifle on shotgun action [Re: CptCurl]
      #195118 - 28/11/11 02:38 PM

Ahhh just wondered. I ended up with a 303 Imp as I sort of got lumbered with this Century Arms P-14 sprter and the chamber was soooooooooo tight it was a PITA. After much deliberation I had Norman Clark of Rugby ream the chamber to .303 Epps but I actually got the case shown:-





One day I will have to re-machine the action to a proper contour. I don't know who Century used to make the barrels but like the Ruger No1's it's what we would consider "Oversize". I had one of these although mine was slightly used instead of new (newly converted that is) and mine shot well. In fact I shot it quite often at 600 yards and Bisley.

Now if I was to attempt a shotgun 303 conversion then the old COgswell & Harrison NE might be worth looking at. Sorry o photos of it but it's a plain colonial model and has a slightly heavier action BLNE than the norml English game gun and has the Greener cross bolt but it's straight hand stocked though.... Will have to have a browse about and see what's being offered around these parts out of interest. I cannot do anyhting about ti but can dream and sort of work it out.

--------------------
Don't let the bastards grind you down!

Edited by CptCurl (02/12/11 10:17 PM)

Post Extras: Print Post   Remind Me!   Notify Moderator  
Smoke73
.300 member


Reged: 30/05/11
Posts: 164
Loc: Rocky Mtn. House Alberta
Re: .303 Improved for a Dbl rifle on shotgun action [Re: Brithunter]
      #197117 - 18/12/11 11:33 AM

I've had the same thoughts. The calculations that we use for backthrust are flawed at best as there is no allowance for going from a shotgun hull(straight) to your typical rifle cart.(tapered). Daryl has it right when he says pressures must still be in line for the parent cartridge. You are are correct in that a straightwall will be easier on the action. Ellis is correct when he states that even when the math has been done one must still proof a double.

--------------------
Your not tired, you just think your tired, you don't even know what the hell tired is.- Garth Ahlstrom (Thanx Dad love ya)

"When one of them is born, their god says ' Go in peace.'
When one of us is born our Gods say "Go hunting."- J. Emmett Willie

Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1


Previous topic Previous   View all topics Index   Next topic Next   Threaded Mode Threaded  

Extra information
0 registered and 27 anonymous users are browsing this forum.

Moderator:  CptCurl 

Print Topic

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

Rating:
Topic views: 2171

Rate this topic

Jump to

Contact Us NitroExpress.com

Powered by UBB.threads™ 6.5.5


Home | Ezine | Forums | Links | Contact


Copyright 2003 to 2011 - all rights reserved