80-90% in the 10" @ 40yds. Really!!?? Even with 18 g/cc tungsten, which you said you shoot, I only average about 50% in the 10 with a .665". That's with #8s which tend to pattern a little tighter than the #9s from my experience. I consider a good, broadly effective pattern to yield to a 40yd pattern of 45% in the 10" and another 40% in the 20".
Personally, I like the #9s as either will kill as far as 99.9% would consider and it allows me to open the choke (.670") a bit and larger patterns yet still get 100 in the 10 to 70yds.
Using your 10ga, how much shot are you throwing? I assume you're going something like 2.25oz and shooting #8s or #9s. Otherwise, why not just shoot a 12ga. Yes?
So, you're getting something like 450 and 640 pellets with #8s and #9s, respectively, in the 10" at 40yd, assuming the low end (80%) of your estimate. I've never heard or seen anything like that before. I can't imagine getting to those percentages with lead, or 13g (Hevi-13) or 15g (Federal HW) shot. All I can say is you're consistently getting 80-90% @ 40yd is you're ready for the NWTF championships. You'd beat the best 2-3X over. Just sayin'...
Edited by BlueK9 (02/19/12 08:40 PM