I have pretty tight availability on everything up here is Canada, and if I have to import it, every ITAR component costs me 300 dollars in bureaucracy, so I am trying to work with what I have. Which at the moment is several .510 barrels, easy access to reloading brass and bullets for .510s.

Action wise I have cheap access to Dumoulin actions, and Zastava long and "magnum" actions. These top out at 30-06 lengths, or with tweaking 375 HH lengths. I gather that head size they can squeeze a 458 win onto the Zastava actions.

I want to make a powerful 50, and what occurs to me is a rimless 50 Alaskan, or starting with the 50-110, cut it back to as much case and bullet as one can easily manage in a long action.

I have lathes so I can reshape the rim on the cases, but I don't know whether the web is normally up to that kind of deal, seems to be OK with the AR fatties, and the Nyati.

Who has already been down this road?

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Something like the 50 B&M would probably be OK, the only thing I noticed was the cases cost the same as a 505 Gibbs, or 500 Jeffery, and those cases are finished. While It would cost a lot to get an action in that size, it would probably be relatively easy to get my money out of that kind of project when I wanted to move onto something else. Some wacky short 50 only makes sense if the ammo cost is low, and the action is cheap.

Life can be made easier with a Siamese Mauser action I’ll PM you a link regarding such a conversion.

Here is some food for thought. If you were to use a P-14 action, your magazine capacity problem would be resolver. This is what was formerly my .500 SRE rifle, now owned by Buckstix.



















My cases were formed from .460 Weatherby brass, trimmed down to 2.5", so as to fit into the P-14 magazine. Performance is most gratifying.

I haven't located a source for P14 actions up here, but like you, I would imagine they are somewhere. Sarco has them at such a reasonable price that even the 300 dollars on top would keep the price reasonable. And I have some curiosity about that action for various reasons. My initial thoughts along these lines were to do a 500 A-Square in a P14. Your comment that the P14 handles your 2.5 inch cases leaves it open for the 50-110 at 2.4 inches, no trimming.

Very nice rifle, pretty much exactly where I am headed. Where could I read some of the articles you mentioned?

Where a Weatherby wildcat doesn't meet my needs is that the brass up here for the nearest Weatherby I could find, the 378 (they are probably just out of the 416 and the 460), cost exactly the same as the real Jeffery and Gibbs stuff. which is about 3x the Starline 50s. Of course, if one has to spend 6 dollars a case, so be it.

I suppose with the P14 action, I could do the 50-110 thing, then move up from there to whatever by simply rechambering. Whether the 50-110 is safe in a rimless configuration is maybe a question for a wildcat forum?

I pay the extra money for Quality brass in the 500 AccRel (for 500 AccRelNyati),

but a person get some 416 Rigby brass, cut it off, anneal a bit as wanted, neck it up and down (just a bit of the old neck will be left, mostly the old body-shoulder will be necked down), ream the neck, trim.

Thom Dl,

John Buhmiller made this work with a minimal case taper, supposedly:



If you could do .500-caliber instead of .510-caliber:




Rip ...

There are better bullet selections available in.510".
The 500AccRel is all you will need, use the Nyati throat.

300 RUM base is 0.002" smaller than the 50 Alaskan. Headspace off case mouth.

M

500 accrel - rigby brass, or derimmed weatherby ... easy peasy to make .

quote:

Originally posted by Mark Clark:
300 RUM base is 0.002" smaller than the 50 Alaskan. Headspace off case mouth.

M

yep .. as the rum ARE canadian in origin (imperial mags) ..

I didn't have much difficulty getting a line on some P14s up here, as members suggested I might not,so that is an option.

I can also get a Siamese Mauser, though for whatever reason, that doesn't appeal to me as much, but it can handle a rimmed 50 AK and deliver 2100 fps with a 525 grain bullet.

I will study some of the option presented here and see how they might fit in. Thanks for the ideas.

Check out Tradex for Woodliegh bulletts