You' re in good shape based on those results. Actually the 20 gauge shoots at a higher velocity than most 12 gauge loads. Sounds crazy but it' s true. If you have the pattern(which it looks like you do)it' ll kill them just as dead as a 12 gauge at 40 yards.

My daughter' s gun is good out to 35 yards. Sounds like you have the right combo.

Good Luck!