Unless you expect to be attacked by little birds, do not use birdshot. Use 00 Buck. It will do the job.
In reference to useing the .45/70 round.Don't get in any gun fights with buffalo hunters. There ain't no such thing as cover
The 40 should make a bigger dent. Most 40's make more energy than most 45's. Check your ballistic charts. The energy a round makes is a reasonable indication of relative stopping power, compared to others.beardman2 said:is it me or is the 40 "dent" deeper than the 45 one?