Re: Model 70 XTR .264 Win Mag Updated
If you're interested, I recently finished-up a load for mine.. & like I mentioned in my first post, the rifle is very-similar to yours. 26" pipe on mine tho.. not sure if yours is the same that-way or not, but is still a factory-barrel none-the-less...
I am shooting Berger 140gr lead.. like yours (should be) mine is a 1:9 twist and does stabilize the 140s. I started seated pretty deep, at 64gr Retumbo and worked right up to 69 actually... including a few 1/2gr charges. Settled on 69 in the end.. bullets seated as long as the magazine will take (and still feed properly) - that said, my batteries died in the caliper and I can't list my COAL.. but is no more than a 1 or 2/1000th or so between the tips and the magazine box. Longest possible! Groups touch @ 100.. 3133avg vel... & has a single digit E-spread! Is outstanding. I was only able to reach that with a very long seated bullet.. consistency went out the window seating deeper (too much "jump" I presume)
Anyway.. I used Nosler Brass, fed215 match primers, retumbo and the hunting vld berger 140s.. took 58 rounds to settle on that, but it shoots amazing... if you're interested in trying that load - like I said, model 70 xtr very-much the same as yours. Use caution and work-up to it, but my bet would be it'll shoot similar in yours..