gp-100 357 forcing cone

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After 250 rounds the wear is showing up again. Ruger did rebarrel the gun free of charge. I have another GP-100 which has about 1000 rounds through it without any signs of wear on the forcing cone at all. I shot the same ammo in both guns and kept them both cleaned well. I love the gun otherwise. I guess I'll just shot it until it gets like last time and contact Ruger again. It's got to be a factory defect of some kind since both GPs have had the same ammo and the same treatment. IMG_0123.JPG IMG_0813 (3).JPG Anyone venture a guess as to why this is occurring? The top photo is before I sent the gun back last time. Bottom pic is now.
 
Flame cutting would be a good guess. What ammo are you shooting? If you're shooting reloads share the specifics. My guess is a hot 110 gr or 125 gr load.
 
stonebuster said:
After 250 rounds the wear is showing up again. Ruger did rebarrel the gun free of charge. I have another GP-100 which has about 1000 rounds through it without any signs of wear on the forcing cone at all. I shot the same ammo in both guns and kept them both cleaned well. I love the gun otherwise. I guess I'll just shot it until it gets like last time and contact Ruger again. It's got to be a factory defect of some kind since both GPs have had the same ammo and the same treatment. View attachment 773942 View attachment 773943 Anyone venture a guess as to why this is occurring? The top photo is before I sent the gun back last time. Bottom pic is now.
Click to expand...
Excessive gap, cylinder axis misalignment (perhaps even on just one hole drilled off center), or improper heat treating of the barrel I would surmise.
 
In the 2nd pic, it looks more pronounced on one side. So maybe alignment
 
Off the topic, I admit, but when I look at the OP's pic I see a bunch of radial machining marks. Didn't Ruger, years ago, have a reputation for rough machining of the charge holes? Maybe that extended to the forcing cone as well?
 
stonebuster said:
I just noticed while cleaning I have forcing cone erosion on a 7 month old gp. I've shot Perfecta fmj 158grain 357mag and 38 specials 158 grain @ 1000 rounds. Also shot Winchester 125/130 grain @ 300 rounds. Seems to be excessive wear to me. I've cleaned the gun right after each trip to range. My question: Is this excessive wear that I should contact Ruger about? I've shot no handloads or anything under the 125grain.
Click to expand...

My old GP forcing cone looks worse than that. The thing is I can't remember seeing that on my gun in the past.

I leaded the snot out of my GP by firing about 20 rounds of old .357 full lead ammo recently. I really need to get some chore boy as I've got at least 5% of lead to still remove. I wonder if it will reveal the true nature of my GP's forcing cone?
 
mcb said:
Flame cutting would be a good guess. What ammo are you shooting? If you're shooting reloads share the specifics. My guess is a hot 110 gr or 125 gr load.
Click to expand...
No reloads, all factory ammo shot in my GPs. Perfecta 357 mag158gr. FMJ and Perfecta 38 special 158gr FMJ. I also ran some Remington 38 special 130gr. FMJ and very few 125gr. 38 special LRN. It wasn't lead the last time in the top pic and Ruger put a new barrel on it. My other GP has many more rounds through it and the cone is perfect. There are rough machining marks beyond the face of the cone on the inside. so if it's not the ammo or leading I guess it's an alignment issue although the wear is starting pretty much all around the edge of forcing cone. The odds are probably small that I got two improperly heat treated barrels.
 
ColtPythonElite said:
Thousands of lead ones outta this one and never cleaned....Newer 686

View attachment 774054
Click to expand...

All three of those are right and properly dirtied revolvers. Excellent, I hate overly clean guns. Is the groove in the top strap of the 686, just above the cylinder gap, just in the build up of carbon and lead or has it actually cut into the metal of the top strap as well?
 
It's a flame cut into the carbon and lead. That gun is so dirty that the scope mount screw holes are about filled.
 
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