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I've looked over some different load data and have not found a load for 3200 FPS out of a 60 grain bullet. Comparing apples to apples, I have loaded for both the .223 Remington and the 6 x 45 for years, and I get about 30% more energy out of the 6 x 45 than I do the .223. I do shoot some 60 grain bullet out of my .223, but they don't go out at 3200 FPS.
Even though I do have two bolt-action rifles chambered in 6 x 45, the AR-15 is the real draw for the 6 x 45, not the bolt-action. If the .243 Winchester would fit in the AR-15, we may not be having this discussion.
I have sold MANY 6 x 45 rifles to folks that have hunting predators with the .223 for years, and have been very happy with the added performance they get over the .223.
Seems like you can look at charts and tables that will support or undermine just about anything you want. In reality, I have been shooting and building rifles chambered in 6 x 45 for years, and the folks that have them are definitely seeing the increased performance.
I can agree that this really makes the most since in an AR, if you have a bolt gun, just shoot a 243!! anyways I have some milsurp green tip 5.56 ammo, this stuff has a green tip 62 grain bullet, its about the most inaccurate stuff I have ever shot, however if I pull the bullets and seat a 60 grain vmax it will push them in excess of 3200 fps actually about 3325-3350 fps from my CZ 527 no pressure signs or other issues. I have no idea what powder they use for it, but I suspect duplicating it shouldn't be a problem. Its also quite accurate with a number of different bullets and weights, that 62 grain military bullet really sucks