Berger 140's? Which one? I've used their Match Hunting VLD(PN 26504), Match Target BT(PN 26409), and their Match VLD(PN 26401). All work well and have great BC's, but it seems many of my rifles are somewhat finicky about them. The two built 6. 5x55s I've had, one was a match rifle, and liked them a lot, but the hunting rifle wouldn't group with them. I had a factory Husquavarna Mauser with the Chrome Vanadium barrel that would shoot anything, but it got confiscated by my Dad, and he shoots the Hunting VLD in it. You've got to have a good barrel to shoot them; I'd suggest 1:8 twist for best accuracy. I believe the Tikka uses a 1:9. 5, so you might not have much luck, but occasionally, factory barrel'll shoot the Bergers if they're really good barrels. The bearing surface is much shorter on the Bergers than most other bullets, most factory twist rifles won't shoot them. Of course, you won't know if you don't try, right?!?!

If you have to compromise, try the Berger 130s, as they've worked good for me in factory rifles that didn't like the 140s sometimes. The Sierra 140 matchkings have a much longer bearing surface, so they have more bullet in contact with the barrel to better stabilize it, so they typically shoot better in factory barrels.
As for terminal perfomance, I've killed, literally, thousands of hogs with match bullets, countless coyotes, and quite a few deer, including some 170-80 class B&C Whitetail bucks. I use a lot of the Sierra 140 6. 5 and 168 7mm Matchkings, and quite a few Bergers and JLKs(quite a bit more expensive!!!), all with great results. I'm not sure I'd go after a big bear with them, but any less than dangerous game, sure. Elk, I'd personally go for a spine shot, but that's my preference. On a shoulder shot, for yardages around 300 like you're talking, they should work well. You're only going to see 26-2700fps, depending on your load, but that still gives you well over 1,000ft-lbs of energy at 300yds, so it should work very well on elk. At 2600fps muzzle velocity, using the 140 Berger Ballistic Coefficient (G1, old calculations) of . 612, at 8,000 ft of elevation, you would have roughly 1600 ft-lbs of energy. For comparison, a 300 Winchester Magnum, shooting 180gr Hornady Spire Points 3,000fps(guess work here!!), would have @2200 ft-lbs of energy at 300yds, and work very well, if you don't flinch from recoil.....

But getting back to the hogs, they are a very tough animal to kill, let alone kill in one shot, and I have killed hundreds with my 6. 5s, be it my 6. 5x55, 6. 5x284, 6. 5'06 RCBS, or my . 264 Win Mag, and very seldom have they ever run off... if they did, it was my fault for poor shot placement. If the round will kill that 2-400lb boar in one shot, it will do the same on an elk. I've only killed one elk with a 6. 5, and that was my . 264 Win mag, so no direct experience with my 6. 5x55. But if it works on elephants, surely it can take down an elk!!:-laf