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My long range match rifle barrel so chambered died at 640 rounds. Case mouths gripped bullets with 1/16th inch of the neck. Went from sub MOA at 600 yards to near 4 MOA over 4 shots in a match. 72 grains of H870 under 139 grain FMJBT nickel plated Norma match bullets.Then there is the venerable 264 Win Mag.
It's about the same as the 260 Rem and barrel life about 2000 rounds best accuracy.Is anyone shooting the 6.5 SUPER round...????
I'm referring to match barrel accuracy..264 Win Mag doesn't burn barrels any faster than anything else. My buddies and I have never had one go less than 4000 rounds before they open up. With 300 fps speeds faster than a 6.5 CM with the same powder and bullets, it's a no brainer.
That makes sense. The general perception of a 1 hole group is twice the bullet diameter. .528" groups at 200 yards all the time over near 4000 rounds is pretty good. First time I've heard of such phenominal accuracy.But, as far accuracy, the barrels shoot one hole at 200 yards for pretty much the life of the barrel, and that's good enough for me and most people.
That makes sense. The general perception of a 1 hole group is twice the bullet diameter. .528" groups at 200 yards all the time over near 4000 rounds is pretty good. First time I've heard of such phenominal accuracy.
How many shots per group?
Like I said, I don't punch paper that much unless I'm trying out a new load or scope. But after I dial either of them in, I shoot 3 or 4 shots at 200 yard and sight in 2" high at 200. With a custom barrel and the same amount of powder using the same bullet a .264 is up to 300ft faster than a 6.5 CM across the board. Something CM shooters would strive for if it was an option. When my buddies with CM's start dumping PD's out further than me, I'll take a second look at one, but there's no need to fix something that ain't broke.
Both cartridges in Nosler data use 24 inch barrels and the 264 has around 300 fps faster speeds. Pressures can be assumed equal. Barrel weight doesn't make any difference in velocities.The .264 Win. Mag. load requires 25 percent more powder to achieve a nine percent increase in velocity over the Creedmoor, and the .264 Win. Mag. requires a longer, heavier barrel to do so."
What's the established criteria for a cartridge to be "over bore?"Over-bored cartridges shooting lighter bullets are inefficient, and he pointed to the example of the .264 Win. Mag. versus the 6.5 Creedmoor.
Do they have equal throat length? I've seen reports of 270wby mags shooting at some ridiculous speeds, faster then a 270-300WM and in large part due to throat.Both cartridges in Nosler data use 24 inch barrels and the 264 has around 300 fps faster speeds. Pressures can be assumed equal. Barrel weight doesn't make any difference in velocities.