What type of sights do you have on your JM?
So what's your verdict on the Marine spacer? I've looked around and it seems like most everybody likes theirs, but what are the main goals of replacing it, and what was your experience with it?Can't wait to run it at this weekends match....
Also, if your chamber is fairly rough, some of the textured, weak-walled shells (Estate, Winchester Super) like to cling for dear life when extracted. It sounds like yours is right on the edge of wanting to run them right. A slick chamber may be the remaining hurdle.
Assuming you are running your gas system dry and the Frog Lube is on your bolt/slide/etc?
Also, if your chamber is fairly rough, some of the textured, weak-walled shells (Estate, Winchester Super) like to cling for dear life when extracted. It sounds like yours is right on the edge of wanting to run them right. A slick chamber may be the remaining hurdle.
The Estate wasn't consistently happy in any of our 930s until we went after the recoil spring assembly. Perhaps an interesting experiment would be to dismantle (for weight testing) and chrono some of these notoriously problematic loads to see how optimistic some of the FPS might be, especially out of short-barreled guns. Time to dig out the XX-Full choke.
William
http://www.OR3GUN.com
William,
so any advice/instructions as to the problem areas of the chamber I should focus my efforts on first? Just sand and lube, or do I need to try and do something else after sanding?
Correct. Run Dry and Frog lube is all over the bolt, slide, gas piston/piston area. Seems the FTE began on the second box so fouling may also be a factor. Also, it wasn't consistently failing. Just 3 times out of 25. But that's better than what it was which was every other round before with that brand.
I'm not going to go crazy with it but I will check for any rough areas in the chamber as requested. This wont be my go to skeet gun as next year I'll be in the market for a Beretta 686 Silver Pigeon Sporting 30" O/U. I'm getting old and need an old man's gun lol
I'd be interested in your experiment if you do it.
Water Monkey
The polishing method commonly used on gritty shotgun chambers:
no courser than 800 grit automotive sandpaper, wrap a section into a tube small enough to fit inside the chamber and lightly lube the chamber with light gun oil
Attach a 12 Gauge bronze bore brush (on one section of rod) to a corded or cordless drill.
Insert the brush into the chamber, let it grab the paper and spin it for about 5-8 seconds, moving it slowly in and out a bit.
Repeat the above with 1000 grit, then 1500 grit automotive papers and light oil in the chamber. Wipe the chamber clean and run a bore snake after each grit.
Cover the bronze brush with a piece of cotton cleaning patch. Wipe a very thin coating of Flitz or Mother's Mag Wheel Polish into the chamber. Spin the patch for 8-10 seconds. Wipe chamber.
William
http://www.OR3GUN.com