I don't know what kind of rifle you have, but make SURE you check to insure the rifle has "freebore".
Most rifles bored for the 7x61mm Sharpe & Hart cartridge produce very high velocities compared to other magnum calibers, but at least some of that "high velocity" is due to the 7x61 S&H rifles being FREEBORED.
If your rifle is NOT "freebored", then do NOT attempt to load rounds all the way up to "maximum" loads.
If you're not sure if your rifle is freebored or not, have a good gunsmith check your rifle to find out. Better "safe" than "sorry". :-)
Strength & Honor...
Ron T.