Bobby Tomek in Texas has done some extensive test w/photos of TSX vs TTSX vs Accubonds.......long story, I think he found the TTSX did not perform as well (lacked expansion at lowered speeds in the bullets he tested in 7mm), and they cost more.
The 85 TSX works so well and based on my 85 X bullet experience, I'd take the 85 over the 80. It works. Looked at the Barnes booth and the 'story' behind the features of the bullet is a good one, but I personally have selected the 85 TSX and the 95 Ballistic Tips as my first two 'go to' bullets of choice in 6mm for anything in 6BR thru 243s/6mm.
http://forums.accuratereloading.com/eve/forums/a/tpc/f/3221043/m/605102309?r=679105409#679105409Bobby, posts an updated thread, had better luck w/a 2nd batch of 120 TTSX in a 7mm Bullberry TC carbine, apparently not thrilled w/earlier test with 140s and the first batch of 120s.
I'd want to test any mono bullet if I could not find much info on actual results by someone reputable, before shooting in the field. Odds are the 80s will work well, but I am skeptical if they offer much improvement if any over the 85s, and I believe they are pricier.
Lefty, my conclusion has been a work in process, as a pendulum, I used a 243 100 partition for a spike deer long ago, nothing special, short run, but no signs of hit at impact and small exit. BUT, dead deer. Since used many other bullets, in 6mm BR and 243s. 85 BTHP I have seen kill like lightening, but so have I done a DRT on a nice hog with an 85 X. BULLET choice + shot placement = clean quick kills IMHO on deer sized and even larger game in 6mm bores.
That said, a 6mm bore is not for everyone. For those willing to choose shots if need be depending what bullet is in the chamber, and pass up questionable shots, it's a good choice, but for anyone ready to blast at any angle/range and with any bullet loaded up, that is irresponsible, but it can apply to others.
Maybe a 6mm has less 'margin of error' with marginal shot placement, but who can tell me what 'margin of error' is acceptable with ANY cartridge w/confidence?
It's great for kids/youth as it allows more practice and better shot placement/shootability IMHO, and a good choice for seasoned marksman/hunters who KNOW what they are doing.
Average Joe's, well a 120-140 grain bullet in 25 cal to 28 cal will give more latitude if poor shooting takes place. BUT, a poor shot will wound the same.
I'd bet 98-99% of failures w/6mms are due to either poor bullet choice and/or a combo of that plus poor shot placement.
Shooters who properly place a good 6mm slug thru vitals and see the outcome a few times, gain plenty confidence in this round that likely will be debated for a long time. I still make sure I have a good target/aim before I let one fly, but I don't shy away or worry when afield with one in hand.
After seeing a 105 amax from a lowly 6mm BR at 2840 MV, drop a 400 yd deer, double lunged - dropped w/in 25 yds, exiting golf ball size JUST as my THIRTY yd deer hit by a 243/100 partition did (ran 30 yds)...also broadside double lunged.
No substitute for shooting well.