I've tried the 80 SBT in my Tikka T3 Lite 243 with several different powders now - and I'm still not satisfied with accuracy. I really like this bullet though. It seems to foul less (less bearing surface I guess), holds together well at distance and in wind for me, seems to be able to reach speeds of 3400+ and then due to its light jacket, it just DUMPS energy on any varmints producing solid kills with much more blowup than most anything else I've seen to-date in the 243. I also don't think it gets as easily disrupted (in grass/tall weeds) as the plastic tips. I've been through IMR-4064, H414, and Reloader 19 so far. And maybe I'm just too particular. I've definitely had these better than MOA, but haven't been able to get 5 shots to sub 1/2" @ 100, at least not more than maybe once. 3/4-1" is more the norm. As I look at IMR-4350 now, I'm thinking I will start going from about 43.0 - 44.0, then try to move up to about 45.5 day 2, where I'll hopefully push up then gradually to about 47.0 by the end of day 3. I've seen a few out there doing 48 and breaking 3500fps with this bullet but in my experience so far with the SBT, that's really really pushing it in a straight 243. If I find something amazingly accurate of course, game over. I've shot enough of these at my first IMR-4064 charge of 39.8 delivering about 3,375fps to know that... well, 3300 and change with this baby is just fine! I'm mainly just interested in finding the most accurate combination I can with this bullet - if anybody out there has any suggestions for me. Thanks.