TonyRumore

I wouldn't think a .378" size extractor would be used on a .534" case head??? The largest you would be able to buy today would a 458...

My load data is all at my other shop, but the powder of choice for the 6RPM is 24N41. I tried every powder in that burn range. Tony

I have a 6mm RPM. 27" Krieger 1:7, left hand Weatherby Mark V. It's quite a bit faster than my 6-270imp.(Catbird) Tony

I don't know about that. It works quite well in a general purchase light machine gun (M60). In that role, I can't think of a different...

FWIW, I've got a semi-auto chambered in 458 Lott, 5+1 capacity. It weighs 11.5 pounds scoped and loaded up. I need to take some video...

I just got back in stock at various distributors. Try MidwayUSA. Tony

Those 105's shoot nice in my Ruger SFAR 6CM gas gun. Here's five at 300 yards. Tony

If you plan to hunt with your 50, Hawk makes a 700 grain soft point. Tony

Lol. That looks like a mistake. Tony

Years ago, I attended a Soviet Weapons Armorer's course at Front Site in Arizona. We fired the PKM machine gun until the barrel was...

Yeah, I would definitely start low and work up. A guy on another board thought "similar" was "equal" and went way over pressure...

I use an RCBS Ammomaster 50 BMG press for the big ones. The press is threaded 1-1/2" and I have bushings for the 1-1/4" and 7/8" dies...

While hunting, I prefer a shoulder holster. Tony

Here ya go.

Looks like a decades old Sierra Silhouette bullet. Tony