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What kind of terminal ballistics are you expecting at 500 (+) yds from a .260 (120/140 gr.?) fired from what appears to be the 14.5" barrel?
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Based upon what other people are achieving with the exact same gun, I should get 2500fps with the existing barrel. In antelope country, I hunt at about 5000 feet elevation. Using high BC bullets of about 120 grains, I will have an impact velocity of about 1800 fps and a little less than 900 ft# of energy. Antelope are really fragile boned so you do not have to have a lot of bone crushing power.
If the existing barrel does not have enough accuracy for such a shot or the twist is too slow to stabilize the bullets, I will rebarrel to a longer barrel and faster twist that will give me a lot more velocity.
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What load are you using?
And where’d you find pistol data for the .260?
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Most people use Varget in the 260 but it is scarce and I need all of it for F-class matches. I have some IMR 4064 that is not immediately needed and so I will work with it. People have been reporting very good results with Reloader 17 in 308 sized cases and it can be found in stores so I might give it a try also. The problem component at the moment is Federal primers.
The older XP -100 single shoot actions were simply designated Remington 600 actions. The XP-100R (repeater versions) are Remington model 7 actions.