MountainSmoke
40 Cal.
For me a big part of having a small caliber rifle is having a smaller lighter rifle to go along with it. I don't know if that would be the case or not with the rifle you have in mind but it's worth considering. Like Bradley_TX stated earlier a 32 is really the ultimate small game muzzleloader. Ya sure you can load down a 45 caliber rifle and take a squirrel with it just fine and it would be a more versatile rifle too allowing you to use it for big game also. To me though a true "squirrel" rifle a lighter smaller rifle in general. Kinda like fishing for blue gills with a salt water rod and using 4 pound line. Ya it will work but it's not nearly as much fun as using an ultra light spinning rod for the task. I have fallen in love with the 32 caliber. They are just so fun and economical to shoot. Lead and powder seem to last forever. The 36 would be much of the same but a 36 has a a good bit more horse power than a 32. A little too much for me personally for small game like squirrels. Good luck on your choice.