selsnslim
The base of the bullet is not cupped.
I believe I'll stay with the 30gr load as it's fine for precision in my mind and I have no plans to shoot this rifle much past 150 yards for deer at present.
I'm still considering getting a larger diameter bullet but mostly just for educational purposes. There seems to be a place or two that have .378 bullets and there's always the Hawk soft copper jacket model to try. I would of course and as you state lower my powder charge (essentially start over and beginning load values) when switching bullets.
Here's a link I found to an article by John Taffin... Thanks
http://www.sixguns.com/range/336cwby.htm
