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Fire Lapping???

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Old May 22nd, 2011, 06:51 PM   #1
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Fire Lapping???

How do you know when you should fire lap your gun? I have a constriction in my barrel and Ruger techs assure me it not that much, measure in the ten thousanths of an inch, .0000"
Seems to group well when the operators does his part. But I always hear about how much better the accuracy is after fire lapping.
So how do you know if it should be done?

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Old May 22nd, 2011, 07:04 PM   #2
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Everything you ever wanted to know about fire lapping.
A Contemporary Look At Barrel Leading and Related Sixgun Issues
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Old May 22nd, 2011, 07:06 PM   #3
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here is an outstanding article on the subject:

I haven't tried it yet, but I might.
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Old May 23rd, 2011, 03:29 PM   #4
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Fire lapping isn't near as good as hand lapping in most cases IMO. Fire lapping too much will ruin your barrel, whereas with hand lapping you can concentrate on any tight shots or constrictions such as you mention. You might look into hand lapping before pulling the trigger on fire lapping.
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Old May 23rd, 2011, 05:36 PM   #5
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Abrasives+bullets never sat well with me. I believe most guns get the same effect from being shot with plain jane FMJs or brass jacketed bullets. Also, most barrels seem very smooth, there are only a few guns that I have seen NIB that really need to be smoothed; my Ruger 10/22 which shoots amazing groups anyways, and my P345 which has about the roughest barrel I've ever seen and will shoot the balls off a butterfly.
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Old May 23rd, 2011, 08:35 PM   #6
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Simple answer Don't
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Old May 24th, 2011, 05:19 PM   #7
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They say theres another alternative to traditional fire lapping. Thats to shoot MANY jacketed bullets. But fire lapping is supposed to be done at high pressure but low velocity, using a fast burning powder. If you decide to use the jacket bullet method vs. true lapping are you supposed to load the rounds with the same type principal, high pressure but lower velocity?
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Old June 23rd, 2011, 12:59 PM   #8
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I took the plunge with two Rugers.

Used the Tubb "Final Finish" on my new series stainless Mini 14 and the Beartooth Bullets kit on my custom Blackhawk in 45 Colt.

Using Caldwell "Rock" and "Pistolero" rests for both guns and 100 and 25 yards respectively for testing purposes - I would declare success "as advertised" in both cases.

I suspect a lot of the good results I had came from reading the instructions a few times, following them and being absolutely obsessive about cleaning between shots.

David Tubb has by my reckoning, established a fair track record for success, so I figured he was pretty smart, so why not - and the Blackhawk barrel didn't need a "Hawkeye" to see how rough it was.

Of course I had the Blackhawk chamber throats reamed to a common standard - one was actually .449 - pretty tight - before fire lapping.

These days the fellas at my range who knew I was "certifiable," look at the results and just scratch their heads...

Again, success two times for me, others might have different results.
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