Lots of good info, we all agree it does (sometimes) takes a while to find a good load and longer for a great one. Got lucky on my TRG 22 .308, found a great one rather fast; not the same story for TRG 42 (.338LM, 1:10 twist).
This is where it is at now:
Messed around with different powders and bullets in many different configurations, Berger 250 and 300 OTM, Lapua 250 Lockbase and 300 Scenar, 285 Hornady Match and 300 SMK. Powders were Ramshot Magnum, RL 33 and H1000, also got 8 lbs of Winchester Supreme 780 but did not get to it yet. Still did not get "the load" that makes you say "WOW!" every time. Plenty of loads were good but not good enough. Thinking of it, my method was not methodical enough.
So, time for a change and tried for the first time ever a ladder test; once main details worked out (still a bunch to learn, hope it was done right), opted for H1000, 300 Berger OTM; not married to these but had to pick something and had decent results with that combo a while ago. Rounds were close to mag's max length at (OTB) 3.023, so still a lot of jump, as the 300 OTM is on the lands at (OTB) 3.136, in my rifle. Lapua brass trimmed at 2.715, CCI 250. Powder loads ranged from 88 gr to 91.3 gr, .3 increments, target range 600 yards. Did weigh the bullets, Bergers are very consistent, more than the Hornady or SMK (all good bullets too but weight fluctuates a bit more).
3 ladders, shot low to high, high to low and low to high, did not round robin but will do next time. Best node was between 88.3 and 88.9 gr; no FPS, as Mr Chrony's battery decided to die at the very beginning of the test. For the record, not heavy bolt lifts or suspicious looking primers during this test and the TRG performed well.
Looking forward to run some accuracy tests with these loads and play with seating depth but just had enough Bergers to run these ladders, so now waiting for the brown truck to show up (in a few days).
As keeping busy rules and having a plan "B" is always a plus, especially nowadays, 3 new Ladders are ready to go, this time with 300 Lapua Scenar/RL 33, loads are from 92 to 99 gr, .5 increments, planning on shooting around 500/600 yards. Bullets will seat .02 of the lands (OTB 3.132), will be looking for possible pressure signs, still Lapua brass(annealed, shot 3 times)/CCI primers.
If anybody sees that I am doing something funky and/or could improve these tests, please feel free to jump in, you won't hurt my feelings.
NB: will also try the 300 Scenar with the H1000, just curious about RL 33.
Few facts noted when messing around with different loads, in the TRG:
Shot 300 SMK (OTB 3.085), 89.5 gr H1000 at a mile (15"x24" silhouette), good accuracy even though crappy wind on that day.
Shot 285 Hornady Match/H1000 (cannot remember powder load, it's in a book somewhere), sat from .06 to .02 of lands; not so good at .06 but noticeably better at .02, closer may get even better.
Shot Factory 250 Lapua Lockbase, 1/4 MOA/100 yards, very good factory ammo (did not try them further, was a one time thing). Failed to duplicate this with my reloads (used same OTB length, same FPS) but only tried them with Ramshot Magnum. Looks like Lapua may be using N570 for these, may be the RM wasn't a good match?
Did took notice that Lowlight has a lot of good things to say about the 285 Hornady (I did read the Gunsite report, good info), even though he does not like to reload but we may not hold this against him.
Dogtown will always remind us about the possibilities of the 300WM, which makes sens for a lot of shooters.
Grizzdude, let us know how the Cutting Edge bullets are working for you; I know you will have a video out soon, looking forward to check it out.
More and more good comments about DTA, they must be doing something right.
Sako, good luck with your 64" barrel, did you have a custom made cleaning rod for that thing and how is it working out for you in the woods?
Thanks to everyone for their input, good stuff; originally was asking about the 300 SMK, to know how they were behaving after a mile, as I may be working right away on something that will hold the distance well. Didn't get a .338 to shoot at 100 yards; well, only if I have to
Good shooting to all.