I tried several powders and settled on H1000 as it gave me the best accuracy in my limited testing, after barrel break in and a batch of fireformed neck sized brass with my new set of Redding 338 Edge dies, my accuracy sweet spot was right at max at 92 gr of H1000,
10 3 shot groups at 100 yards averaged at 1/2" but I noticed some slight shiny spots on the case head, the bearing surface of the 300 gr Accubond is quite long and probably contributes to the quick rise in pressure, to remedy this I coated a box of these bullets in WS2 and then worked up to a compressed load of H1000 for even better groups, after shooting 10 3 shot groups at 1/4" and no shiny spots I had my hunting load, had no time for chrono-ing the loads and estimated velocity at 2850-2900 fps from other sources with similar loads, loaded up 20 rnds and the hunting season was in full swing .....
I was set up for a max shot at 800 yards, but the bull moose did not cooperate and came in close.......
On Sept 19th, 2012 I shot a 53" bull moose at 30 yards and the impact of the heavy bullet nearly knocked the bull over at that range, he tumbled over after a couple seconds and was still after doing the death kick for half a minute....I was really impressed by the performance of the Accubond that close up, no part of the bullet was recovered, there was tremendous shock and organ damage but no bullet fragments were found.. I shot him just behind the shoulder hitting a rib on the way out, but other than that is was a complete pass through with the lungs and liver turned into a frothy jellied red mush, maybe the results would have been different if I'd nailed him in the heavy shoulder bones..... My brother had the exact same performance on his 61.25" bull he took just a few days after (Sept 22nd) he shot his at a ranged 120 yards with a 30-378 WBY Mag and a 180 gr Accubond that was not recovered but organs were turned to mush and the bull dropped where he stood... I would not hesitate to use this bullet and powder combo on brown bear up close and in fact is my load for my fall brown bear hunt with my 338 Edge