Troubleshoot my rifle misfiring?

Joined
Dec 22, 2020
Messages
435
Location
Nunya
Hi folks.

I have a Ruger M77 in 270 (1975 vintage). I inherited it a couple years ago. It sometimes misfires.

First time it happened, my FIL was shooting at an elk and it failed to fire like 5-6 times in a row before finally going off. I took it to the range afterwards and it shot w/o issue, so I chalked the previous problems up to maybe ice in the trigger/action (we had crawled through the snow a fair ways to get into position for the shot).

I was having work done on my primary deer/elk rifle this fall, so I took this one outta the safe for a little time at the range before taking it in the field this season. First time I pull the trigger, nothing happens. Sooo…back into the safe it goes till I figure this out.

This has occurred using different kinds of ammo. After the misfire, the primer is dimpled.

Any idea what could be causing this?
 
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