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Old 01-15-2018, 07:20 AM
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Default 627 PC crown

I stumbled across a thread dealing last summer with the imperfectly chamfered muzzle of a 627 PC.
Two parties as usually discussed about the inevitability of such occurrences in the industrialized production vs. the good gone times of craftsmanship, but the majority swayed toward the unacceptability of the defect.
I therefore focused my attention on the muzzle of my 627-6 5”, whose some rifling lands do actually protrude past the crown (forcing cone & cylinder look good to me).
Indeed, I even did notice the detail when I bought it, but did not pay the matter much heed.
I would like to know about whether the issue is merely aesthetical or might be relevant on practical grounds.
I don’t get my best groups with the 627, but I’m not used yet to the gun features, namely weight, sights and above all the trigger, so that I definitely can’t blame for sure any gun defect for some inaccuracy.
What’s your opinion, gentlemen?
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Old 01-15-2018, 10:35 AM
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It makes no functional difference IMO. I have found the ECM barrels as is to be more accurate than I am.
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Old 01-15-2018, 10:55 AM
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I'd send the first picture to the mothership to see what they think. I suspect that they'll replace the barrel.
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Old 01-15-2018, 11:17 AM
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Quote:
Originally Posted by joe44va View Post
I'd send the first picture to the mothership to see what they think. I suspect that they'll replace the barrel.
Thanks. I guess the muzzle could be easily smoothed without changing anything. Just wondering whether this would be worth the trip, waiting and risk of mishandling potentailly causing different inconveniences.
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Old 01-15-2018, 11:25 AM
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Quote:
Originally Posted by shocker View Post
It makes no functional difference IMO. I have found the ECM barrels as is to be more accurate than I am.
PC guns, like the OP's, are broach cut rifling, not ECM.
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Old 01-15-2018, 11:53 AM
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My 627 PC was pretty boogered at the muzzle...



It was highly unacceptable for me, I sent it back in, S&W took care of it, I got it back about a month later.

You paid good $$ for that revolver. My opinion? If you're unhappy with it, do like some are saying and contact S&W about it.
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Old 01-15-2018, 11:57 AM
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It seems as they cut / center everything from the grooves, not the lands and the lands have significant variation in height. Very common these days and I doubt they will replace it. If you follow those lands back to the forcing cone you will find the same variation of depth forward and aft based on the height of the lands. The higher lands with be cut back further and lower less.

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Old 01-16-2018, 02:43 AM
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IMO, cleaning up the muzzle/crown can improve it's grouping.

I've chamfered several of my revolvers & my unscientific observation is that some of them grouped consistently better afterwards.

Some had no apparent change.

If done properly it will not have a negative affect.

.

627-5 PC, barrel crown, before chamfering

(-03a)

.

627-5 PC, barrel crown, after chamfering (before polishing)

(-01a)

.

Brownells Chamfering Tools

(-01a)

.

Brownells Chamfering Tools

(-02a)

.
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Old 01-16-2018, 04:16 PM
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My 686 pro series shot patterns not groups, Muzzle crown looked like doo doo. I sent it back, looks better nd now shoots much better.
All the pr series gun I have looked at recently seem to have the same defects. So common that when I called about the CS rep already knew the problem before I finished talking.
We need to send everyone of these guns back Dont reward S&W;s crappy QC by fixing it your self.
Only way Quality is gonna improve is if gun buyers make warranty work more expensive than better QC,
As it stands Smith is just saving money on making crappy guns and then only having to fix a few.
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Old 04-15-2018, 05:54 PM
fuelbender fuelbender is offline
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Default 627 crown

my 627 pro had a crappy crown; I recut it and my groups at 20 yds shrunk in half with the same ammo.

Question About Newly Made 627's

Last edited by fuelbender; 04-15-2018 at 05:57 PM.
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