I want to bounce off my data against the collective wisdom of this unique group of men to verify my load.

My Holland & Holland (Webly) .303 rifle was made in 1896 and probably used Whitworth steel barrels, and thus was a very early smokeless DR. In 2002 it was re-chambered to .35 WCF for whatever reason.

My current load is 46gr of R15.

I derived it this way:

a) the max pressure for the 303 is 43 cup, which is the min pressure for the .35 whelan.

b) the .35 WCF is very close to the .35 whelan in dimension minus 4 grains volume.

c) my load is min load whelan - 10% or 46 gr of R15. I've got to believe it's below 40 cup.

d) velocity is measured 2200 fps.

Thoughts and comments welcomed.