Ruger SR-762 under-gassed?

[MultiCaliber]

The .308 and 7.62 NATO rounds are ever-so-slightly different. A perfect 7.62 NATO chamber may very well gauge as excessive head space with a .308 Winchester chamber gauge. So naturally, any gun designed to fire both will be ever-so-slightly loose for the .308 and ever-so-slightly tight for the 7.62.

I am not a huge FrogLube fanboy but one thing I do use it for is treating the inside of brand new rifle chambers. I have not had rounds stick or require excessive force to cycle since I began doing this. If there are any surface imperfections inside the chamber, this will give it a bit of slip-n-slide while those irregularities are wearing in.

Give it a try, and report back. Also, try some other 7.62 besides just the federal... that will let you know if it's a particular sort of ammo that may be contributing to the problem.

Sounds like good advice. I'll check my LGS for froglube. Regular old gun oil no good for this? Lord knows there was enough of that stuff slopping around from the BCG when I was shooting it...

[bruss01]

I think any lube would be better than bone dry.

FL has some interesting properties when heated, it is aleged to "soak into the pores and crevices" of the metallic surface. I can't vouch for that, but I can vouch for my own personal results with it (the paste, not the liquid). A chamber gets pretty warm, it sounded like a good match, and I had a sample of the FL handy, so that's what I used when inspiration struck.

Maybe it will work for you, and if so, you've saved turn-around time shipping it both ways for them to tell you there's nothing wrong with the gun. If it doesn't work, then ship it back and let them sort it out. I had to send a gun back to Ruger and their customer service was top notch... they paid the shipping both ways, and it was gone less than two weeks. An inconvenience, certainly, but I had other guns to shoot in the meantime so I didn't mind that much.

[Quiet]

This, in thought Ruger piston guns had adjustable gas blocks

It is adjustable and has four positions.

So, which position was it on when the OP shot it?

[MultiCaliber]

It is adjustable and has four positions.

So, which position was it on when the OP shot it?

Does anyone actually read the original post anymore? See above. It was stated in the original and re-hashed when someone else didn't read the first post and advised me to change the gas setting. I mean, make a comment in a post with some erroneous comment, ok, cool. But the question you asked was answered in this thread, not once, but twice. Whew. Sorry to rant. I'm sure you're just trying to help.

[Jalibass]

So what happened?