625-8PC forcing cone

[Beecherkid]

I have a new 625-8PC that I noticed the barrel forcing cone gets a noticeable carbon build up from about 5 o'clock around to about 7 o'clock. I do not have any lead fowling in the barrel. I shoot light target loads with coated 200gn lswc.

The gun is not a tack driver for me as it groups about 4" @ 25 yards, with my forearms resting on a sandbag.

I inspected some of my other revolvers and noticed the forcing cones had an even appearance all the way around.

I have tried using factory fmj ammo too and the carbon build up is the same.

Any thoughts???

 

[bananaman]

I have a 625 JM. Shooting lead always produced quite a bit of leading. Went back to Berrys plated, and pretty darn clean. One thing that I did before I switched back is clean the barrel with a bronze 20 ga. shotgun brush. Makes quick work of cleaning. Bob

 

[Beecherkid]

The issue is Not lead deposits, it is a carbon build up of about 1/32" on the bottom of the forcing cone before the rifling starts.

 

[PERAZZI]

What's the load. on 2nd thought, if your only getting 4" groups, I'd check the parallelism of the forcing cone to the cylinder face. I might be a large variation that is allowing blowbye

 

[Maximumbob54]

Just bite the bullet and send her back to the mothership. Four inch accuracy and build up is not a S&W much less a PC S&W.

 

[Beecherkid]

Thanks for the replies.
How can I check the barrel to see if it's parallel to the cylinder? I do know the b/c gap is .006 when I check it on both the left & right sides.

I will call the Mothership after Christmas but was wondering if this was a real concern first.