Re: 260 Rem Vs. 6.5-06
For me time is short, components are expensive (primers approaching .$05 each, specialized dies are expensive, fire forming is a chore and so on.
A common 6.5-06 according to many manuals should propel a 140 gr bullet somewhat between 2700 and 2850 @ between 62-63 thousand psi. What ever would be chamber pressures for a 140 grain bullet at 3200 fps out of some barrel of 28 inches or less from any case .264 Win mag or smaller?
I can acquire a mass of 06 brass, a 8 lb jug of H4350, and numerous boxes of 100 gr 6.5 Hornady AMax bullets and produce enough ammo for an entire season of varmints. I sort cases and turn necks. My loads are very consistent usually running less than 15 fps (plus-minus) at the 3300 fps level with a 24 inch barrel. To distribute barrel wear I have 2 6.5-06's and pass up shots so my barrel won't get too hot. 123 gr. bullets work well in the 6.5-06 but I like the 100's for low profile targets.
For shooting targets my 6.5-.308 has been doing just fine for the past 2000 rounds plus. The 123 Hornady AMax does well out to 1000 yds and out performs both .308 or .30-06.
I use regular .30-06 and .308 brass for both. H4350 appears to give the best uniformity. Velocities differences between both are not much.