I may have more years on me than the OP, so I can appreciate where he is coming from. Combined with the fact while I can still handle most 12ga loads for a long day of shooting, I also see many of age who can't. And for many of them the answer is a semi. So it was thrown out for consideration.
As far as shell base and overbore, while you are correct, please don't assume that you are special in being aware of the effects. Is the OP aware of them? Did you address them in your reply? Or is it just now convenient for you to do so to impress us with your experience. Overbore will help some. Worrying about the base of the projectile is pissing in the wind. BP claims their wads reduce recoil, but they measure velocity different. And are considerably more expensive than most other options.
Are 20ga 101's overbore? Honest question, I don't know, but it was one of your suggestions.
Last edited by battue; 08/29/17.
