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If your rifle is a CZ, 260Rem, it will do better than 3,015 if you use a Lee Factory crimp die, RP brass and LG powder. The 40gr. Vmax, 40gr. Ballistic Tip and 40gr. Barnes Varminator
Both of my CZ's exceeded 3,300fps with those bullets & my brass went 14 rounds without a single loss. No expanded pockets, no split necks.
The RP brass is necessary to get these ballistics. It is the thinnest of all the brass, yet showed more than ample strength. WW brass can load up to 13.5gr. in those CZ 527's and achieve just over 3,200fps with them.
My best gopher shot was 454yards with the Ballistic Tip Nosler, vel. 3,357fps. I only partial FL sized them to about 1/2 neck length, with long oal as possible, only 1/10" of bullet in the case and crimped in the die. This, of course, further increased the capacity. My CZ routinely made groups well under 3/8", even under .200" at 100 meters, making only slightly oblong holes for 3 shots. 5 shot groups went under 3/8".
An amazing ctg. in these rifles. The Ruger #1's as well as M77 .22Hornet and TC Contenders also handle these loads perfectly. As the pressure is said to be in the 50,000PSI range, these loads are not recommended for older or weaker actions- at all.
That I was able to use pistol primers with never piercing a primer, shows the pressures not over 50,000psi, and likely in the 45,000psi range. 45,000psi is said to be max. for pistol primers.
My first CZ went over 14,000rounds of these loads wit the original 500cases I purchased, before I turned all the brass into .17AH's and used a re-chambered .17 Rem CZ take-off barrel. The brass was fireformed and loaded twice more for a total of 17 times before it needed to be annealed.
I will note at this time, that the CZ Hornets I have had (2) both had quite snug chambers, as well as the .22 Hornet Rugers I tested and the TC Contender. All worked well with the WW brass at 13.5gr. and the RP brass with 14.0gr. and 14.4gr. LG loads.

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I'm using Winchester brass in a Blaser K95 single shot.
I could get more speed as 13.5gn is the GOTO load apparently, but I'm only loading 13gn as it fills the case up well for a compressed load and I didn't see a point in pushing it.
3015fps is plenty fast out of a gun I was only expecting 2700fps from, and I don't like shooting maximum hot loads although I doubt throat erosion will be a problem in this case.

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One shot is all you need.

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