Re: 264 win mag --for what?
I blew 85 Sierras in my 6.5-300 Weatherby, running them at 4,150 or so. Made a helluva mess and took a while to get the copper back out. Out front, it looked like I had fired a .410 and the fragments shredded grass 5 yards in front of the gun.
100 grain Nosler BTs held together OK, but the 120 BTs shot better.
JMHO, but trajectory is only 1/3rd of the story when it comes to long range, and the wind is what really gives most of us a fit. Heavier bullets resist wind better and make long range hits easier. The lightest bullets I use in the 6.5s (.260/6.5-284/6.5-300) is the Normal 130 in the .260, and use 140 or 142 SMKs in everything else.
The beatings will continue until morale improves.