Originally Posted by Cessna Flyer

There is always a benefit to more shot in the air, and your pattern may stay the same or tighten up some with same shot size used. Why are you really asking? cost?
When I do pull my 20 gauge out I use 3" shells more than 2 3/4 when hunting other than preserve birds, I use a double blackpoder mostly now.
Remember get up to that 1 1/4 oz and you have the eq. of a 2 3/4" 12 gauge, yea some of you will disagree, look at the velocities of both in standard loading, they are pretty much equal, one just has more shot= more killing power.