I have a 416 Rigby and want to expand my enjoyment, research, and development. I'd like to develop a lighter plinking load for extensive practice so I can become one with the gun. As I was thinking, why can't I develop a light zippy load for deer? Not much availability below 300 grains? Are there some custom bullet makers that make a .416 around 250 grain? Paper patch a .41 cal handgun bullet? I'd like to get it up to 3000 or perhaps higher for some long range hunting of deer or antelope. I know the b.c. wouldn't be the best but I anticipate a long winter with time to putz. Feasible or does someone need to slap me ?