171gr .243 @ 3300 FPS?

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I was looking at factory load outs from Federal and velocity combined with BC (Extrapolated from Hornady), the best combo I found was .270 in 130gr .460 BC at 3060 FPS. And .270 is an easy round to acquire.

I can get 110gr @ 3400 fps or 150gr @ 2800 FPS and all retain 2000 FPS out to 500yrds (1900-2100 FPS)
 
I once had a rifle chambered in .264 Winchester Magnum. According to the ammo makers, this cal will go in excess of 3,000fps with 140 gr bullets. I don't know what the BC of these are but I do know that you can hand load them a little faster than factory specs. I also know that by the time you have worked up a load and sighted the rifle in, the barrel will probably be burnt out.

I bought mine years ago from someone that said it had less than a box of shells through it and it looked new. Wow, it shot a 36" group at 100 yards! I rebarreled the rifle to .300 win mag.

Shooting these slow powders to achieve super velocities with heavy bullets out of long barrels tends to be hard on the barrels.
 
I think if you did a 243 round, and handloaded 115 dtac bullets, you could accomplish both 3000fps, and a very high b.c.

go this route for starters, or get a rifle chambered in .243 AI, i think you can fire standard ammo in it, then it will be fireformed.

The 270 is a great LR round, but you can do better in terms of high bc bullets, and lower recoil. if you don't mind the recoil (of around a .270), a round that fires higher bc bullets can be found.
 
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