The 32 cal. is all you need for squirrels...i shoot 20-30 gr powder..
prefer the smaller-less weight roundball.
I try to keep some kind of back stop on shots at squirrels..tree trunk-branch...mindful of shot angles.
Had issues with the bore of my 36 cal. rifle..had it relined to 32 cal. no regrets.
Found that finding the most accurate load in the small calibers....... the window was smaller.
I use a wet lube and god forbid a short starter.. solid brass ram rod..just works for me.
can hold them inside a quarter at 40 yards using a 42" barrel with a tang peep on a good day.
You'll enjoy the smaller calibers. Think head shots .
after barrel relined by Bobby Hoyt...... I pulled the 1 st one...bp Gremlins at work.