Originally Posted by biff's reloading
i didnt mention this, but its a 1:10 twist. as im reading, im finding out that a 10 twist would be better suited to a magnum that can push the big bullets. at 16 1/2 lbs, the recoil wouldnt be bad with a 300mag im sure. is there a way to look up numbers or identify the action to know it would be fine with a 300 mag? then the only work needed is re-chamber/open boltface?
would this be the better route to take?
I would recomend Talking to Ted (Shortgrass) and if anyone can tell you what you have it,s him.
The problem with the belted mags is that the bolt face has to be opened up, This is not hard to
do on a Mauser but it does increase the bolt loading. (Larger case head,more square inches for the
pressure to work on at the same pressures).
The 30/06 will have about the same pressures (55,000 to 60,000 psi) as the 300 win mag. but
having less case head surface, the 30/06 applies less bolt thrust. (Its like the difference between
a small block and a big block chevy)the same combustion pressure but more piston thrust and
more crank and bearing loading.
Your original idea to stay with the .473 was a good one and the 1 in 10 twist is recomended for all
30 calibers and mote bullet weights. A 308 win with a 1 in 10 twist will shoot 220 grain bullets well
so you will be good with anything faster than a 308 win.
The newer Short mags and Ultra mags have higher pressures (65,000 to 70,000 Psi) so I would
not recomend these in an older action of any kind.
Also recoil will be very manageable in a 8 to 10 pound rifle.
J E CUSTOM