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Double Rifles, Single Shots & Combinations >> Single Shots & Combination Guns

DoubleD
.400 member

Reged: 23/11/03
Posts: 2437
Loc: Retired in Oklahoma

Re: Martini 577-450 Sporting Rifle - Help with proof marks
17/06/19 10:50 PM

I am not a fan of the Adapter. In the 577/450 chamber they can stick. That chamber was designed for a foil cartridge and only has standards of dimension in the head of the chamber for the steel head of the cartridge. The front half of the chamber is not standard. The shoulder is a ogee-two opposing arc, the radius of which is not standard and not precisely located.

When fired the shoulder of the adapter which is flat-straight is forced into the Ogee and sticks. The first time it sticks in a chamber should be the last time it is fired in the chamber.

I have removed several of these, the last which required removal of the barrel. Of course the gun owner had followed the advice of a Shade tree Gunsmith and filled the adapter with lead to try to get the adapter out. I had to put the barrel in the lathe and drill the lead out to get the adapter out.

I have an adapter. 45 ACP in 45/70 I haven't seen it in years. It was tedious to shoot. You have to load twice. Load the cartridge in the adapter, load the adapter in the rifle, fire, unload adapter from the chamber, unload the adapter-sometimes with a stick, repeat. To slow, to boring. It did not shoot well. .452/.454 bullet down .460 groove. Martini, 45 Colt in 577/450. .452/.454 bullet down a .468 or larger throat for about 6 inches to meet a .464 groove.

Analogy's I have used over the years to compare subcaliber adapters-Kissing your sister or showering in a rain coat.

--------------------
DD, Ret.

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Subject	Posted by	Posted on
Martini 577-450 Sporting Rifle - Help with proof marks	buckstix	15/06/19 02:42 PM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	93x64mm	16/06/19 08:01 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	DoubleD	16/06/19 11:36 PM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	buckstix	25/06/19 10:07 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	DoubleD	26/06/19 02:09 PM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	buckstix	26/06/19 10:11 PM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	lancaster	28/06/19 04:42 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	DarylS	26/06/19 01:32 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	degoins	26/06/19 03:01 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	93x64mm	26/06/19 06:22 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	lancaster	25/06/19 01:45 PM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	lancaster	17/06/19 03:11 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	buckstix	17/06/19 04:48 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	DoubleD	17/06/19 10:50 PM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	buckstix	19/06/19 09:46 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	DarylS	20/06/19 02:06 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	CptCurl	20/06/19 08:13 PM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	DarylS	21/06/19 02:15 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	93x64mm	21/06/19 06:10 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	CptCurl	21/06/19 09:59 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	93x64mm	22/06/19 05:51 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	buckstix	22/06/19 08:49 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	DarylS	22/06/19 12:36 PM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	buckstix	22/06/19 04:53 PM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	lancaster	22/06/19 06:22 PM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	DarylS	23/06/19 02:53 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	93x64mm	23/06/19 08:00 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	DarylS	23/06/19 05:56 PM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	CptCurl	21/06/19 10:07 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	DoubleD	22/06/19 12:28 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	CptCurl	22/06/19 01:53 AM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	DoubleD	26/06/19 01:59 PM
Re: Martini 577-450 Sporting Rifle - Help with proof marks	DarylS	21/06/19 06:45 AM

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