There shouldn't have been any blowby in a .750 back in the old days. I measured some Remington fiber wads and card wads and they fit tight as a tick in my .750 Super barrels. I measure them after trying them in the bore and they measured exactly .750. The fiber wad may have been a bit bigger before I ran it into the bore, don't know. The bad news is that a AA plastic wad is only .740 so it should be loaded fairly hot to seal in a .750 barrel. However, today's overbored skeet barrels are in the .740s and seem to seal just fine with plastic wads. I may load a few of the fiber wads and cards in good AA empties and large shot and see what I can get out of them. I can't think of a better combination than low velocity, mushy fiber wads, big hard shot, and a .750 bore with over .050 of choke. I may shoot some 100% patterns if I use a shot cup and some buffer. I'll report back in about five years when I get to this project.
