The factory magnum bolt face for the Short action of PTA will require a different pin assembly, but if you buy a Long action magnum bolt head and have a machine shop shorten the stem to the same length as your 22-250 bolt head then it will work just fine with your pin assembly.
To remove the bolt head:
- remove the Bolt Assembly Screw (at rear of bolt)
- slide off the bolt handle and rear baffle
- slide the black sleeve (visible through the cut out in the side of the bolt body) all the way back and lift out the little button on the side of the bolt.
- firing pin assembly will fall out the back
- then push the small black pin out (cross ways through bolt body behind the bolt head)
-slide out bolt head, spring washer, and front baffle
Reassembly is reverse order, just put in whatever bolt head you need, reassemble and headspace your different barrel and you're all set.
If you become a paid member there is a nice article you can access that will give you better details and pictures on this process, IIRC. It'll be the best $15 you spend all year.
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