Max load for .410 is...
3/4 of a ounce. You be somewhat limited in range for squirrels unless you get
BUT the .410 will also, chamber hte .45 LC round, is that a option??
.410 doesn't meet minimum energy levels to humaely take a deer. that why some states invoke these minimums.
20 ga., is better as you can get slug barrels to handle deer.
Good luck deciding.