For those that desire 200+ yard accuracy using a 50-cal ML with these long, narrow 40-cal bullets, good luck with that. I tried going this route using the PRBullet Extreme Elite 260gr in 50/40. There is a limit on distance-accuracy where extra long & extra narrow muzzleloader bullets exist.

My range experience was limited to the Extreme Elite's all-lead bullet construction. These copper-clads above may fly a little straighter than lead..... may not..... I dunno!