Yes. I was thinking about all the BC testing you guys have done and reported. Did the BC's align with the wind sensitivities of the barrels that Arzrover tried in his USFT?
And thanks for all the data-based insights you, Arzrover, and other provide on this site. I have learned a lot. Hope someday to be able to contribute.
I have seen a huge number of barrel/pellet combos over the years and some seem to be so much less wind sensitive, though not absolutely more accurate, than others.
@Franklink and I have brainstormed quite a bit about it. He is quite methodical and fun to chat with on a good number of subjects though we mostly are curious about accuracy related things. We have not solved it all, of course, but there are some commonalities.
It's rare to see an inaccurate barrel give higher bc's.
Deep rifling grooves have given lower bc's.
Heavy chokes... lower bc's.
So best barrels I've seen are shallow groove or poly (no groove), light or no choke, and highly symmetrical with a gentle leade and as perfect of crown as possible. It's all about little to no damage to the projectile and symmetry for balance.
There are lots of aspects that we haven't yet tested. Two that come to mind are obturation and projectile fit. The obturation is swelling (reshaping) when the air blast hits it and could be the source of imbalance and more drag. Projectile fit is important for shaping the projectile in a consistent way.
Anyway, the test we drew the most data from was using the JSB 10.3s at as close to the same velocity as I could conveniently generate and compared the velocity lost downrange (drag) to calculate bc. The polygonal bores were generally the best with the slow twist poly, possibly being best of the bunch. If you look at the targets generated, there is a TREND but the absolute accuracy is not really a factor because the 10.3s weren't necessarily the best pellet in every barrel.
All that said, DRAG is the main factor in bc and it VERY MUCH relates to wind sensitivity. This is why we were wanting to compare all these... to try to understand why barrels of pretty equal accuracy give much different wind sensitivity with the same projectile.
I tried to run all my tests in a short time period on the same day to have as close of conditions as possible.
So now that I've gotten far away from the op... the best were likely our two USFTs with poly's.
Bob
donnyfl.com 
www.airgunnation.com 
