Bjay Posted July 22, 2020 Share Posted July 22, 2020 Ive only been shooting jacketed with my cmmg 9mm pcc..with rear lead exposed i was told that these are leads. Close to the muzzle end How do i get rid of it?? Link to comment
Kokeman Posted July 23, 2020 Share Posted July 23, 2020 (edited) I use Montana x-treme and some elbow grease. I also switched to plated bullets to prevent the lead fouling. Edited July 23, 2020 by Kokeman Link to comment
practical_man Posted July 23, 2020 Share Posted July 23, 2020 This will do it mechanically https://www.brownells.com/gun-cleaning-chemicals/patches-mops/lead-remover/lewis-lead-remover-prod21587.aspx there are several home brew alternatives to the Lewis lead remover. IMO, the genuine article and soft brass screens is cheap enough compared to the cost of damaging a barrel. Link to comment
Ming the Merciless Posted July 23, 2020 Share Posted July 23, 2020 13 hours ago, Bjay said: Ive only been shooting jacketed with my cmmg 9mm pcc..with rear lead exposed i was told that these are leads. Close to the muzzle end How do i get rid of it?? What problem is it causing? If your PCC is accurate and reliable, don't worry about. Link to comment
StealthyBlagga Posted July 23, 2020 Share Posted July 23, 2020 Clean it then verify you don't have a ring bulge under the lead. Link to comment
SteelCityShooter Posted July 23, 2020 Share Posted July 23, 2020 I would expect leading to occur nearer the chamber where the pressure and temperature are much higher. However, if the bullet you are using is really having the exposed base eroded, there are several options: 1. A fully enclosed jacket bullet like Montana Gold's "CMJ" (Complete Metal Jacketed) which has a brass disc covering the base of the bullet as well as the regular jacket. 2. Plated bullets as these have no exposed lead at all. 3. Polymer coated bullets which are also fully covered. Link to comment
Bjay Posted July 23, 2020 Author Share Posted July 23, 2020 49 minutes ago, SteelCityShooter said: I would expect leading to occur nearer the chamber where the pressure and temperature are much higher. However, if the bullet you are using is really having the exposed base eroded, there are several options: 1. A fully enclosed jacket bullet like Montana Gold's "CMJ" (Complete Metal Jacketed) which has a brass disc covering the base of the bullet as well as the regular jacket. 2. Plated bullets as these have no exposed lead at all. 3. Polymer coated bullets which are also fully covered. I wanna go back for more load dev. Should i completely remove lead before anything? What solvent can i use? Link to comment
SteelCityShooter Posted July 23, 2020 Share Posted July 23, 2020 There are numerous commercial lead removing solvents and any gun shop and many big box stores with a sporting goods department will sell them. One of them and a cleaning rod with a bronze barrel brush should remove it. A Google search will turn up a lot of recommendations and videos on how to use them. Link to comment
copterdrvr Posted July 23, 2020 Share Posted July 23, 2020 2 hours ago, StealthyBlagga said: Clean it then verify you don't have a ring bulge under the lead. This. That is a heck of a weird place to have a lead deposit and in that specific pattern, ESPECIALLY if there isn't any lead anywhere else in the barrel. Link to comment
Bjay Posted July 23, 2020 Author Share Posted July 23, 2020 12 minutes ago, copterdrvr said: This. That is a heck of a weird place to have a lead deposit and in that specific pattern, ESPECIALLY if there isn't any lead anywhere else in the barrel. Its not handgun..its PCC 14.5" with brake 1 hour ago, SteelCityShooter said: I would expect leading to occur nearer the chamber where the pressure and temperature are much higher. However, if the bullet you are using is really having the exposed base eroded, there are several options: 1. A fully enclosed jacket bullet like Montana Gold's "CMJ" (Complete Metal Jacketed) which has a brass disc covering the base of the bullet as well as the regular jacket. 2. Plated bullets as these have no exposed lead at all. 3. Polymer coated bullets which are also fully covered. I wanna go back for more load dev. Should i completely remove lead before anything? What solvent can i use? Link to comment
copterdrvr Posted July 23, 2020 Share Posted July 23, 2020 That makes it even stranger to me to think that the bullet makes it 14 inches down the barrel and THEN leaves a very narrow ring of lead in it................... Link to comment
Bjay Posted July 23, 2020 Author Share Posted July 23, 2020 (edited) 16 minutes ago, copterdrvr said: That makes it even stranger to me to think that the bullet makes it 14 inches down the barrel and THEN leaves a very narrow ring of lead in it................... IMO its the brake that causing it..the pressure behind the bullets before leaving muzzle..once hitting muzzle brake wall its the ring of pressure/fire including carbon and left over residue ie. Melted lead? Its the only explanation i could come up with lol Like how suppressors got dirty? Edited July 23, 2020 by Bjay Link to comment
copterdrvr Posted July 23, 2020 Share Posted July 23, 2020 Actually, that's a pretty darned good guess!!!! If it's not a barrel ring, what the heck else could it be. Link to comment
Bjay Posted July 23, 2020 Author Share Posted July 23, 2020 2 minutes ago, copterdrvr said: Actually, that's a pretty darned good guess!!!! If it's not a barrel ring, what the heck else could it be. I myt switch to blue bullets or any full coated lead from now on Link to comment
Bjay Posted July 23, 2020 Author Share Posted July 23, 2020 (edited) Hmmm i tried jb compound even soak it with hoppes 9 Scrubbed it with boy copper wrapped on bronze brush..the ring got larger in width? Is it possible that ring is a exposed barrel steel.from nitrited coat bore? Edited July 23, 2020 by Bjay Link to comment
Nolan Posted July 23, 2020 Share Posted July 23, 2020 How is the muzzlebrake attached? Threaded, then pinned and welded or ??? If it's threaded 1/2-28, they may have pinched the barrel when they tightened the brake before pinning and welding. Nolan Link to comment
Bjay Posted July 24, 2020 Author Share Posted July 24, 2020 (edited) 31 minutes ago, Nolan said: How is the muzzlebrake attached? Threaded, then pinned and welded or ??? If it's threaded 1/2-28, they may have pinched the barrel when they tightened the brake before pinning and welding. Nolan I pinned it myself.. It was timed and contour by my smith Brake Edited July 24, 2020 by Bjay Link to comment
Dwbsig Posted July 24, 2020 Share Posted July 24, 2020 29 minutes ago, Nolan said: How is the muzzlebrake attached? Threaded, then pinned and welded or ??? If it's threaded 1/2-28, they may have pinched the barrel when they tightened the brake before pinning and welding. Nolan Yeah I was kinda thinking maybe the brake got over tighten and stretched the metal just enough to make a circular low spot which is causing the leading. Link to comment
Bjay Posted July 24, 2020 Author Share Posted July 24, 2020 41 minutes ago, Dwbsig said: Yeah I was kinda thinking maybe the brake got over tighten and stretched the metal just enough to make a circular low spot which is causing the leading. With chrome moly salt bath nirited barrel? I highly doubt that unless barrel was orange heated Link to comment
Dwbsig Posted July 24, 2020 Share Posted July 24, 2020 I thought that treatment was only a couple thousand deep? Link to comment
427Cobra Posted July 24, 2020 Share Posted July 24, 2020 this aint precision benchrest, put the borescope away, clean or don't clean, its a pistol round loaded at low pressure Link to comment
Bjay Posted July 24, 2020 Author Share Posted July 24, 2020 Heres a follow up looks after 100rds today... Link to comment
Bjay Posted July 24, 2020 Author Share Posted July 24, 2020 2 hours ago, Dwbsig said: I thought that treatment was only a couple thousand deep? Yes but it also a process that hardened a steel..chrome moly is even harder than stainless. Link to comment
assaultthesalt Posted July 24, 2020 Share Posted July 24, 2020 31 minutes ago, 427Cobra said: this aint precision benchrest, put the borescope away, clean or don't clean, its a pistol round loaded at low pressure This.....Choot it ! Link to comment
NateTheSkate Posted July 24, 2020 Share Posted July 24, 2020 43 minutes ago, 427Cobra said: this aint precision benchrest, put the borescope away, clean or don't clean, its a pistol round loaded at low pressure 11 minutes ago, assaultthesalt said: This.....Choot it ! Second!! I love all those little hammer-forging marks in the bore......whoever it was that convinced the public that hammer-forged was superior to cut or button rifling must be the Pelé of marketing. Link to comment
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