I dug up that old article in Rifle magazine and for those interested it's in the November/December 1973 issue.The author was John Y. Williamson and he rechambered two rifles;a Rem 700 and a M70 Winchester.

He topped out at 96 gr of the old N205 with the 270 gr Nosler Partition for a velocity of 3024 fps;with 94 gr the 300 gr NPT did 2915....not too shabby,considering we are 38 years after the fact and gunner has managed to notch it up to over 3100 with the same bullet and RL17.

I recall in messing with Thor that it measured in the mid 2900's with the 275 gr Bitterroot but don't recall the precise charges.

In any event these blown out 375's of whatever name and pursuasion can offer a guy some substantial increases in velocity if he somehow finds the standard H&H case lacking somehow.



The 280 Remington is overbore.

The 7 Rem Mag is over bore.