I have a three screw SBH that was a .44 Rem Mag, is now a .45 Colt. It was line bored by Jim Stroh at Alpha Precision, had a Shilen 6" barrel fitted with a long steel ejector and custom front sight. I rigged a trigger stop and it's a shooter.
Target at 25 yds. over a bag with 255 gr. SWC and 18.5 gr. H4227.
IMHO, this is the highest and best use for a SBH .44 Mag...
Third photo, Penn Bullets 270 gr. Thunderheads. Check that meplat. Bad medicine for hogs. .44 Mag can't do that...
I think a stong, accurate .45 Colt will outperform a .44 Rem Mag. I know you can go with heavy .44 bullets, etc. Just saying...
DF