necking out the 7.62x54r

[Oklahoma Rebel]

I have, for a long time, wanted to simply neck out the 7.62x54r out to .358. no change to the angle or anything else, just bullet size, and then get my mosin nagant bored out. then, correct me if im wrong,i would just need to have my dies drilled out and a .358 cal. neck sizer put in, right?

[Oklahoma Rebel]

also if anyone out there has modified the 7.62x54r please chime in with your experience

[Geezer in NH]

I would have the same guy do the dies IMHO

[Hardcast416taylor]

.416 Russian Express. Have only lost 2 parent cases out of 200 when necking the Graf brass up to .416.Robert

[Frank46]

it's called the 9.0x54r and is basically what you are looking for. The Finns developed a bunch of cartridges based on the 54r case. Measure the opening at the front of the magazine where normally the bullet is in a loaded cartridge. That should give you an idea if the front of the magazine has to be opened up. On gunboards there is a thread by CH in the workbench section on how he did a conversion on a M39 from 7.62x54r to 45/70. While not exactly what you are looking for it does detail how the magazine was opened up. Think the Russians did one called the 9mm medved also. Frank

[leadman]

Conversions like this was performed on 30-40 Krags to salvage corroded barrels. Should work well in the 7.62X54r.

[EDG]

Dies are case hardened so they are hard to cut with anything except carbide tools.
Find someone that can do the chamber and the dies so there is no finger pointing to over the changes if something does not work.

The CIP standards have a set of cartridge and chamber drawings for a 9X54 Russian and a 9.3X54 Finn version of this cartridge.

[Oklahoma Rebel]

thanks all. EDG what is/are the cip standards?

[EDG]

CIP standards are the European cartridge and chamber standards

http://www.cip-bobp.org/homologation/en/tdcc_public?page=3&cartridge_type_id=2

http://www.cip-bobp.org/homologation/uploads/tdcc/tab-ii/tabiical-en-page47.pdf (http://www.cip-bobp.org/homologation/uploads/tdcc/tab-ii/tabiical-en-page47.pdf)

thanks all. EDG what is/are the cip standards?

[leadman]

Lee and a couple of other companies sell die blanks so you can use a chamber reamer to cut it to match your chamber.

[TRX]

A friend had CH4D make some custom 54R dies last year. One set was in .338/54R, and I think the other was .444/54R. The guy he dealt with (Darren? Darryl?) said CH4D makes a bunch of custom 54R dies, mostly going to wildcatters in Finland and northern Europe. So they might have die reamers for something really close to what you want already at hand.

[leebuilder]

Neat. Never heard of any above 7.62 but have heard of a 7mm×54r and handled a Russian biathlon rifle in 6.5mm×54r.
Looking forward for more posts
Best of luck
Be well