Unfortunately, the .264 Win. Mag. suffered for decades because of the lack of appropriate powders suited for the bullets and case capacity. 'Barrel Burner', 'Blow Torch', etc. were often used to malign a perfectly great cartridge. The angle of the shoulder didn't do much to help the situation either. 25* simply doesn't make it when you're trying to curtail the hot plasma being routed down the bore when fired. Last but certainly not least was the lower quality of the barrel steel being used by the primary manufacturers and even the aftermarket barrel makers.
Now though, we've managed to surpass all of the flaws and drawbacks formerly used to malign a good cartridge.
We have wonderfully slow, lower burn rate powders and terrific quality steel being used by both the primary manufacturers and the aftermarket makers. Given the factory status of the cartridge, we can't do much about the shoulder angle unless we wildcat the case which doesn't help with the factory classification at all.
If anyone want to give this a try, realize that we have Retumbo, Norma 217, Re-25, Re-33 and even H-1000 or IMR7828 for cooler burning powders. The burn rate required will vary based on bullet weight and seating depth.
I'm shooting a #7 barreled action in a McMillan Marksman stock for static long range spot hunting and I've built several in #4 and #3 barreled walking hunters. All have 26" barrels at least, all Bartlein barrels. Originally, I started out with Winchester factory brass (yellow box) but now I have some Nosler and some Norma brass on hand to compare to the factory cases.
By way of comparison, the 6.5 WSM has the same or similar performance but can be fielded in a short action should you so desire.
Give it a try!