Hello James.....I don't want to take issue with what you've found either. I'm kind of a 30 cal. guy and have noticed (in my guns) that for some reason the tsx is making more velocity than other bullets of the same wt with the same powder charges. OVer at Accurate reloading.com there is a guy with pressure testing equipment that did some extensive research on the 30-06 with different powders and bullets. For him the 180 tsx was making slightly more pressure than a nosler partition with 1 grain less powder than the partition. Over at Real guns.com there is a guy with lots of data on different calibers. He's shooting the same bullet out of the same gun and it seems for him he's getting the same velocity out of the tsx at 1-2 grains less powder than partitions and hornady spire points.
Also, the data I;ve gotten from barnes that is supposed to be corrected for the tsx is greatly reduced from former printings from Barnes.
Now I know these are "readings of others experience" but it makes me a bit scared of trying the same loads with the tsx as other bullets. I've also noted what seems like big pressure and speed with the 168tsx in my 300 win mag and 300wby. And, for some reason that is one bullet that barnes backed their data down on considerably.
I believe in the principal that barnes has reduced pressure with the rings but they still have a long bullet that takes up alot of case capacity which could possibly lead to a slight increase in pressure.
So, I guess it's up to all of us to figure out what they do in our own guns just as you have. I've done some bedding on a problem 300 wby ultrlight and hope to get out and test some accubonds and tsx's this upcoming week. Hopefully I'll be smarter when done. I would sure like to see some extensive pressure tests on the tsx's from one of the expert reloaders here on the forums. The tsx is sure getting super popular with big game hunters.