Contemplating rebarreling a 300 win mag mauser I own to 458 win mag and shooting 500 gr cast over black powder, a poor mans 45/70. I am stuck with the mag bolt face and dread shooting the poor performing 300 win mag. So the 458 win mag has much data for 500 gr bullets and larger using 5744 for powder, the typical BP substitute for low and slow shooting.
So what if I dedicated the rifle to BPCR and shot some big 500gr cb's over 100 gr of BP??
Theres certainly no pressure issues with rifle, chamber or brass. I dunno twist rate that's best but the adams and bennett barrels are 1-14".
Would the 1-14 blow out at 1600 fps and strip being too fast, since a 45/70 is normally “around” 1-20??
Anyway, I would like to take the beater and do a simple rebarrel and I either go back to a new 300 win mag, which unless I become a mil sniper as new occupation, will go UNUSED....... or I change it to a 45 cal that the bolt face will match and shoot big cast but I really want a BPCR to play with. Worst case is if the BPCR doesn't work, I'll load 5744 and shoot cast anyway, low and slow and lob them in just the same.
Any thoughts??
Thanks in advance