336 weak mainspring vs heavy trigger pull/ bent extractor

[ba_50]

I bought a used 1968 336 30/30 and have had several misfires. It shoots 3 inch groups @ 100 yards except when using H-380 for 1 1/4' 4 shot groups with one flyer. I'm thinking it could be a weak mainspring. (erratic ignition?) Yet the trigger pull might be 6# or so.  Heavy pull=good spring? Therefore would shortening the spring lighten the pull rather than buying wild west trigger? Thanks.

This rifle looked like it hadn't had a box of shells through it. Even so, I took the bolt apart, scrubbed the inside with a .22 brush and put it back together. My book said to lift out of the extractor while prying it off. I bent it out too far.

Is the extractor supposed to go against the bolt or flush with the outside? Thanks.

[John Traveler]

Your misfires can be caused by something other than a weak hammer mainspring. 

Excessive headspace, minimum firing pin protrusion, dried oil in the firing pin channel, or dirty action and chamber are all possibilities.

It is not uncommon to find a forty year old gun that has never been detail stripped and cleaned.

I would suggest a complete field stripping, bolt and firing pin removal, and cleaning in a good powder solvent.

The heavy trigger pull can be due to a chipped or rough hammer/trigger sear interface.  Disassembly, cleaning and inspection are  also in order.

[victorcharlie]

I would agree with John......lots of things could be the problem.......a detailed strip and clean would be the first thing to do.....

[wcf3030]

I've fixed my extractor but you can get one for around $5 thru Midway USA.
As for the spring issue the above advice is a real good place to start.
Let us know.

[ba_50]

It took some doing but I got it fit ok. I couldn't get the round part perfectly flush but it kind of floats so it shouldn't cause uneven wear. Even so, I think I will replace it sometime.