Okay, guys, I have reached the following conclusions after more experimentation, and I like the term "tipping" better than wobblin':
a) Titegroup (the claimed villian by some) is right next to Bullseye (the claimed hero) on the burn rate chart, and is not the problem.
b) Bullet "tipping" with 10% lower charge of TG (3.3gr down to 3.0) is still evident, and moreso at 50 yds compared to 25 yd.
c) "Tipping" with 231/HP38, one of the slower pistol powders, is still evident on some shots at modest loads of 3.0 gr.
d) I see "tipping" on the really nice target posted by "two-pound pull," e.g., the "10" at 1:00. I have similar/better targets with same effect.
e) Given that "tipping" is not consistent, I believe that this is a function of cast bullet eccentricity more than anything else.