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ORIGINAL: ShatoDavis
6.5 mm bulletsare killing machines. I would consider it very hard. I just built a 6.5-284 and love it. Its a wildcat but you can buy all the components for it easily. Even the brass is headstamped correctly. The accuracy is legendary. The 6.5-284 is the cartridge of choice for long range benchresters.I'm pushing a 140 gr. bullet at approx. 2850fps out of a 26 in tube. With the ballistic coefficient of these bullets that makes for a very good long range weapon. Also the sectional density of the 6.5mm bullet is extraordinary making it a hard hitting & deep penetrating. If you build the 6.5-284 you will want to build it on a long action eventhough its a short action cartridge. To take advantage of the cartridge you need to shoot the 140's and let them out to the lands orvery close to the lands. If you do this with a short action you won't be able to load the magazine. So the solution is to use a long action.
If you are not interested in that, consider the 6.5-06, 260 rem, or 264 win mag. Otherwise, from the list you included I would pick the 280 rem, but would also consider the 280 ackley
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the 6.5-284 is an outstanding cartridge here for metallic silhouette. has enough residual energy to knock down the "rams" reliably, without punishing the shooter by days end- but like shato said, it'sreally onlya handloaders round. if you want to be able to walk in to a store and buy some ammo, how about the 6.5 swedish? a very under-rated hunting cartridge, and should be available in most places. the 6.5's sectional density provides 308-like killing energy.handloading will get better results than factory rounds though, because the factories are wary of running high pressures in a lot of antique firearms. or another classic - the 7X57 mauser ( .275 rigby to some). Karamojo Bell killed most of his elephants with the 7mm - and even some with a .256 ( 6.5x54 mannlicher). for him, correct bullet placementwas everything.
whatever you end up choosing, i'd recommend something that does what you want it too, and that you enjoy shooting. otherwise, it's a waste.