https://www.65grendel.com/forum/sho...15-gr-TAC-TX-Gel-results&highlight=115+barnes
I understand the 30 tac tx works well but it's about the only one I've seen that will open up, well I have seen some lighter weight lesser known name ones open up but too light to have adequate sd and I shrugged them off as a varmint bullet at best. They've got a ways to go to figure out copper imo, they are too tough and need to be driven. You'll see in above link the 6.5 tac tx doesn't work too hot, really limiting range. I have the factory load for this but have not chrono it, just an impulse buy and maybe future proof if we're forced lead free some day?, but I do average for 5 shots at 2386 fps out of my 16.1" ruger with hornady black factory eld-m ammo.
Got ya!
The coppers....yeah, I hear you. I think its a bit less of an issue since I'm not reaching out as far as you do. Taking the 115gr Tac-TX for example, if we say the minimum velocity for GOOD expansion (not what the Barnes ads consider expansion lol) to be 2000 fps, that gets me a bit past 200 yards. Honestly don't think I'd ever shoot game that far out. From a longer barrel like a 20" or 22", starting at 2550 fps that becomes a bit past 250 yards.
Again, I know some people like you do take game like twice as far out lol. But it would serve the needs here.
The same with the 100gr TTSX, which you can get going plenty fast from a Grendel but bleeds speed like throwing a rock.
The 123gr ELD-M is impressive. Its surprising to hear it can handle game, especially big game. With how aerodynamic it is, I can see how starting it from a 16.1" barrel really offers advantage over shorter, stubbier bullets, and how like you said, driven from a longer barrel its nipping at the heels of a Creedmoor with some loads.
When it comes to the lighter copper bullets, even with the low SD, I think the fact they don't lose much weight compared to 25-30% of even a bonded bullet, and have a smaller cross sectional area when expanded mean SD is not as important as otherwise seems, but then, you do suffer some penalties in wounding ability as well, yeah. The little 100gr 6.5mm shoots through a LOT of animal though, and does a pretty frightful amount of damage. Just the above mentioned ballstics like a rock lol