Thinking of putting a SS pistol together for spot and stalk coyote fur hunting. The 50 gr. Berger 20 cal. is about as big as i wanna go, BUT i wanna push it as fast as i can to maximize the range at which this bullet will perform out of a 17" barrel. I was thinking of the 225 Win. case, maybe an improved BR (Dasher), or possibly the 224 Weatherby. The Weatherby is slightly smaller in capacity than the 225 i believe, but is the brass good?, and do i need to headspace off the belt on that case? Any comments here???