I see a lot of people make a lot of "swaged" bullets elsewhere on this forum. Has anyone ever considered taking a longer brass case and pour it only half full of lead? Like a .223 case flare the neck out of it, drop in a 150-200 grain bullet. You would want to choose a case that fits through barrel and choke if any. The longer case with the weight forward I would think would stabilize better. And you wouldn't have to stack so many cards below it.
I have not done it yet, I started out looking at empty 9mm cases, then an empty 9mm with a bullet seated (for longer tail) then went flying out into space with this idea.
Probably crazy I know, but a necked out .223 with a 185 grain .312 bullet drops right in, a few whacks with a punch and it doesn't move anymore. Be a bit like a shuttlecock, if it starts to rotate the air pressure on that light tail end should swing it right back again.
Just wondering.