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Double Rifles, Single Shots & Combinations >> Building Double Rifles & Gunsmithing

crshelton
.333 member

Reged: 10/11/15
Posts: 379
Loc: Republic of Texas

Re: Rechambering a Double .45/70?
12/04/22 07:45 AM

John/Nitrox,
Before I bought this rifle from the widow of the maker, I collected the history, Beretta factory specifications including pressure testing results, and info like barrel maker and such.
I also followed the structural planning and details as directed in W Ellis Browns book.
My research indicated 45-70 pressures including back pressure on the receiver were well below the specs of the action. The rifle had been hunted for several years and was in as-new condition.

After firing it and taking a 300 pound hog with 300 grain Remington bullets loaded to 1600 fps, I decided to move forward with my planned 45-90 project.

Not wanting to take unnecessary risks, I am using VV N133 powder which generates an average of 12,000 psi less peak chamber pressure than most other powders. So far, I have kept the peak chamber pressure under 40,000 psi and it shoots very well.

I have loaded 45-70 ammo with N133 to a book velocity of 2037 fps and book pressure of 30,450 psi it too is accurate, but shoots a bit lower than the 45-90 loads. Based on my previous experience with my .405 DR, I may be able to find a 45-70 load that also regulates.

Off to a good start and much sport ahead!

--------------------
CRS,NRA Benefactor Member, TSRA, DRSS, DWWC, Whittington Center
Android Ballistics App at http://www.xplat.net/

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Subject	Posted by	Posted on
Rechambering a Double .45/70?	FlatTop45	12/03/22 05:06 PM
Re: Rechambering a Double .45/70?	NitroX	12/03/22 05:14 PM
Re: Rechambering a Double .45/70?	crshelton	13/03/22 01:00 AM
Re: Rechambering a Double .45/70?	DarylS	13/03/22 05:22 AM
Re: Rechambering a Double .45/70?	FlatTop45	14/03/22 03:44 AM
Re: Rechambering a Double .45/70?	DarylS	14/03/22 05:24 AM
Re: Rechambering a Double .45/70?	FlatTop45	14/03/22 01:11 PM
Re: Rechambering a Double .45/70?	50Calshtr	15/03/22 01:44 AM
Re: Rechambering a Double .45/70?	DarylS	15/03/22 03:17 AM
Re: Rechambering a Double .45/70?	crshelton	05/04/22 07:25 AM
Re: Rechambering a Double .45/70?	NitroX	05/04/22 05:36 PM
Re: Rechambering a Double .45/70?	93x64mm	06/04/22 06:59 AM
Re: Rechambering a Double .45/70?	crshelton	11/04/22 07:30 AM
Re: Rechambering a Double .45/70?	NitroX	11/04/22 07:06 PM
Re: Rechambering a Double .45/70?	crshelton	11/04/22 09:57 PM
Re: Rechambering a Double .45/70?	HeymSR20	11/04/22 10:43 PM
Re: Rechambering a Double .45/70?	crshelton	12/04/22 07:45 AM
Re: Rechambering a Double .45/70?	crshelton	12/04/22 08:06 AM
Re: Rechambering a Double .45/70?	crshelton	20/04/22 10:58 AM
Re: Rechambering a Double .45/70?	DarylS	05/04/22 08:51 AM

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