When we had a decent population of big tough native ringneck pheasants, I found that #6's killed with much more certainty than #7 1/2's. And later in the season when the birds tended to flush further out, I would switch to #5 shot, at least in the left barrel. I've never used #7 RST's and have never seen bags of #7 shot being sold in my area for reloading, but would like to try it on grouse. A little jump in the size of a lead sphere makes a big difference in kinetic energy at reasonable ranges.

A true sign of mental illness is any gun owner who would vote for an Anti-Gunner like Joe Biden.