Re: bet sub sonic combo for 500 yards ?
The brass for the .510 Whisper is gonna cost ya. 338 Lapua cases aren't cheap, then add in the machining work. I have a buddy that works at Remington and got me a supply of 300 RUM cases for cheap, so I really don't know what they are going for. Then I got a couple hundred pulled .50 BMG API projectiles from a supplier for $0.50 per. If I use 750gr Amax or Lehigh Subsonic bullets they will cost about $2 a piece. The Amax has a BC so high that out to the 500 yards you want you lose less than 100 fps velocity, the wind drift is minimal and it'll still hit like a hammer. Plus if I ever want to hunt Blue Whale I can push the velocity to over supersonic speeds.
As far as actions go, mine is built on a Savage long action. However I would have to push the long BMG projectiles really far into the case to get them to load into the magazine. So far that I might as well have made the chamber shorter. Not a problem with the straight walled case, just wouldn't have ran the reamer in as far. Mine will load shorter bullets into and feed from the mag, but I don't care if I have to run it single. I do it with my .338 Edge.
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