Cylinder Gap

Cylinder Gap

Joined: December 29th, 2016, 8:08 am

September 18th, 2017, 9:37 am #1

Guys just wondering what your preference is for a S&W Revolver Cylinder gap ? I have heard between 6-7 thou but others are saying 3 thou. I checked some of my revolvers and they varied a fair bit, some were 8 thou and a few were 6.
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Joined: January 22nd, 2012, 7:12 pm

September 24th, 2017, 12:58 pm #2

You'll do fine.
If you were having a custom gun built, maybe .003-4.
But a factory S&W, .006-8 you should be thankful for.
I once had a M14 that was .008-.020,one side vs. the other.
had to have it turned back and remounted.
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Joined: August 21st, 2013, 3:31 pm

September 24th, 2017, 4:51 pm #3

What Jim states is good. Sometime back had one of Smith guys tell me even up to .010 ok as long as it was even all way around. Going to loose some velocity and might spit a little. .004 is usually what you want for competition gun. Too close and u will get build(lead) up and cyl might start binding on you. .005-.006 on an average desirable. We have machine rested some revolvers with up to .008 with no "real" loss of accuracy. Depends on gun and other factors including ammo that interact with each other.
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Joined: December 29th, 2016, 8:08 am

September 25th, 2017, 3:30 am #4

A guy I shoot with has one revolver that is 14 thou and off a sandbag is about 2 inch's at 50 yards which surprised me a bit.
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Joined: December 29th, 2016, 8:08 am

September 28th, 2017, 12:56 am #5

You'll do fine.
If you were having a custom gun built, maybe .003-4.
But a factory S&W, .006-8 you should be thankful for.
I once had a M14 that was .008-.020,one side vs. the other.
had to have it turned back and remounted.
I initially cut the cylinder gap on this Bull Barrel to 3 and a bit thou, shot it and found after about 50 shots the lead build up was scraping on the cylinder face and was snagging up the trigger pull. I then cut it to 5 thou and the problem went away, I noticed no discernible accuracy difference between the closer gap and the final cut. The interesting thing is the standard PF load I use which runs about 900 FPS in 3 revolvers is going 950 consistently in this barrel.
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