Question about Sanford MARK II Tripod

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I have a 270 semi auto from 1969 which the seller said it had only been fired 5 times in that period, i have since put 40 rounds through it and it keeps jamming ive tried remmington,winchester and federal ammunition and they all jam i did take the gun a gunsmith for a good cleaning but it still jams any idea as to what can be done to fix the issue,

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Check the magazine spring; the weapon was probably stored with ammo in the mag, and the spring has lost its elasticity. Try a different mag and see whether it resolves the problem. Other possible issues: inadequate lubrication, a rough spot on the breech block that's catching the cartridge, or carbon buildup immediately inside the breech.

Posted on Dec 02, 2017

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SOURCE: primer failure with federal ammunition

Blown primers and hard ejection are clear indications of excessive pressure. If these are handloads you need to back off on the charge and possibly make other changes in your load. Check a good loading manual for reference.
If they are factory loads you perhaps have a headspace problem or the oal with that particular bullet is too long for your particular rifle, jamming the bullet into the rifling, and not allowing it any "jump space" or lead.
1. dont fire anymore of that lot of ammo, and contact federal.
2. check with a qualified gunsmith, have headspace, and bore diameter checked.
3. if your knowledgable in smoking the tip of a bullet, check for lead, or have this done by a qualified gunsmith.

Posted on Aug 04, 2009

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