I have been running 300 gr OTM's at 2800+ in my 338 RUM for close to 5 years. I started with them in my 27 inch Broughton 5C with a 9.3 twist. My first animal killed was a large bodied 5 point bull at around 500 yards, 4 legs straight in the air DRT, bullet didn't exit, hit was behind the shoulder. Next was a big mule deer,180+ 760 yards, quartering bullet exited with guts hanging out, DRT. 6 point bull elk, 750 yards, hit behind the shoulder, second shot blew off a front leg, bull ran down hill for about 50 yards and piled up. Big bodied 180+ mule deer, 70 yards DRT, didn't even flinch, never moved from his bed. Recovered bullet under hide on off side, took out at least one shoulder. 5 point bull elk, 350 yard shot DRT behind the shoulder, thank god, because if he would have run down the steep hill side below, I would still be there packing him out. Can't even remember all of the cow elk killed with this bullet, no failures including a cow hit in the hind quarter after a bad wind call at 850 yards, she ran about 100 yards in the snow and piled up. Of these kills, I recovered 3 bullets all expanded to about 1.25 to 1.5 inches. All that was found was the jacket. Another kill was a big 190 type mule deer dropped at 485 yards, DRT with a hit that blew up 6 inches of his spine. No exit wound in the hide.
Due to some accuracy issues, I had a new Bartlein barrel installed with a 10 twist. Killed a 170+ mule deer at 485 DRT. Bullet broke both shoulders and was found on the off side under the skin and this bullet resembled a bonded bullet's performance, perfect mushroom 3/4 inch in diameter, lead in tact.
I hunt a lot in grizzly country and I have never felt confident that the berger would penetrate enough in a head on charge situation. I experimented with some 300 grain accubonds this last hunting season. Antelope at 350 yards, hit through the guts, walked 5 feet and layed down, next shot destroyed top of the spine. Hardley any meat wasted. Missed a Wolf at 400 yards, must have been Wolf fever, shot 1/2 inch over the top of his back. He was probably the reason I couldn't find a bull elk. Over 6 wolves in one drainage. Late season cow hunt, hit calf in the neck 515 yards (about the size of big deer) DRT. Several days later shot a cow at around 525, missed the wind call and hit pretty far back through the guts just below the spine. She dropped and crawled into the timber, went about 50 feet. When I got up to her, I realized I made a big mistake, no rifle! I had my handy raging bull 454 in my hand when I saw her lift her head, then she tried to get her feet under her and I had no shot due to the trees. She got to her feet and ran off. I chased her through two small canyons in the snow, she ran in front of my buddy and he missed her. I finally jumped her and put another round in her after my buddy brought me my rifle. The 300 gr accubond entered above her hip and penetrated the entire backstrap, exited above the should and cut a gouge in her head where the bullet presumably stopped. I didn't dig it out. She soaked up that hit, but slowed down and stopped in about 30 feet where a kill shot behind the shoulder that was a complete pass through dealt the final blow. I know, this thread is about Berger's, but in this case, I think the Berger would have severed the spine on the first shot due to the shrapnel and it would have been game over. I have some Hornady 285 eldm's that I am going to give a try, but all in all the Bergers have worked very well in my RUM. This is not the case however with some of my friends that have experienced some failures in 30 cal.