GP-100 forcing cone erosion??

under_dawg · October 24, 2008, 09:55 PM

I hope that ya'll can see the small lines that have appeared on my GP. Is something that should be of concern or is this normal wear? I've probably put about 2000 rounds through the gun with no hot loads.

Sturmgewehre · October 24, 2008, 10:24 PM

I don't see anything in that picture out of the ordinary, nor do I see any excessive erosion.

T. O'Heir · October 24, 2008, 10:57 PM

You mean the wee, tiny, small lines around the outside? Likely bits of lead and nothing to worry about.

under_dawg · October 25, 2008, 05:58 AM

It's hard to see in the photo, but there are very small (for the lack of a better word) cracks that you can feel around the inner edge. Some are visable on this photo but are hard to see. They have a rough feel to them. I clean the gun every time I shoot it, and have never noticed them before. I usually pay special attention to this area because cleaning all the burnt powder is a real pain. I loaded up 20 158gr and 20 180gr XTPs last week with H-110 and Lil' Gun respectively. They were mid range loads. I then shot 50 rounds of 158gr lswc cowboy loads. Can excessive crimp cause too much pressure to build up and cause this? I checked the cases, and there were no signs of pressure. Primers were fine and there was no sticking. I have a Speed-Six that I don't shoot as often, and didn't notice the cracks on it. It may just be normal wear and tear.

44Magnum · October 25, 2008, 10:48 AM

I do not see erosion. Those "cracks" really look a lot like lead. I sometimes have "cracks" appear on the front of my barrel after a lot of shooting. Have you tried a lead solvent, a brass brush, and some elbow grease?

It looks like you may have some lead buildup in the barrel as well, or is that just the lighting? It looks like the classic gray matte finish lead leaves behind.

drail · October 25, 2008, 11:16 AM

I can tell you all about GP 100 forcing cone erosion because I really abused one when I first started reloading. Speer manual said 16 gr. blue dot under a 125 gr. JHP. After several hundred rounds of this the forcing cone looked like I took a oxy acetylene torch to it. Light bullets at max velocities will cause this in time. Yours looks like very minor erosion is beginning but I wouldn't worry yet. If you're shooting a lot of hot light bullets loads you might want to back off.

thetoecutter · October 25, 2008, 03:05 PM

I am assuming that it looks something like this?

Am linking to the pics because to an old internet guy like me they are "big" files.

http://i221.photobucket.com/albums/d...3/IMG_3147.jpg

http://i221.photobucket.com/albums/d...3/IMG_3148.jpg

This would some idea of what >3000 .44mag 180gr JHPs sitting on top of 30gr of WW296/H110 will do to the edge of the forcing cone of a Super Redhawk.

Am shooting lead now primarily (because its cheaper) but would still not hesitate to "erode" it further.

I am not an expert, just a guy that likes to shoot. I am not concerned by it, figure it is the way it is...

TTC

under_dawg · October 25, 2008, 04:58 PM

Bingo! That's what it is beginning to look like. I hope those xtp's didn't do it. I'm shooting alot more low velocity lead now as well.

44Magnum · October 25, 2008, 06:11 PM

If it looks like that then it is mild erosion after all.

October 24, 2008, 10:24 PM	#2
Sturmgewehre Senior Member Join Date: December 12, 2006 Location: Indiana Posts: 4,212	I don't see anything in that picture out of the ordinary, nor do I see any excessive erosion. __________________ Visit my YouTube channel for reviews, tests and more. Ex Mea Sententia

October 24, 2008, 10:57 PM	#3
T. O'Heir Senior Member Join Date: February 13, 2002 Location: Canada Posts: 12,453	You mean the wee, tiny, small lines around the outside? Likely bits of lead and nothing to worry about. __________________ Spelling and grammar count!

October 25, 2008, 05:58 AM	#4
under_dawg Senior Member Join Date: November 15, 2007 Location: Cayce, SC Posts: 222	It's hard to see in the photo, but there are very small (for the lack of a better word) cracks that you can feel around the inner edge. Some are visable on this photo but are hard to see. They have a rough feel to them. I clean the gun every time I shoot it, and have never noticed them before. I usually pay special attention to this area because cleaning all the burnt powder is a real pain. I loaded up 20 158gr and 20 180gr XTPs last week with H-110 and Lil' Gun respectively. They were mid range loads. I then shot 50 rounds of 158gr lswc cowboy loads. Can excessive crimp cause too much pressure to build up and cause this? I checked the cases, and there were no signs of pressure. Primers were fine and there was no sticking. I have a Speed-Six that I don't shoot as often, and didn't notice the cracks on it. It may just be normal wear and tear.

October 25, 2008, 10:48 AM	#5
44Magnum Senior Member Join Date: September 29, 2008 Posts: 325	I do not see erosion. Those "cracks" really look a lot like lead. I sometimes have "cracks" appear on the front of my barrel after a lot of shooting. Have you tried a lead solvent, a brass brush, and some elbow grease? It looks like you may have some lead buildup in the barrel as well, or is that just the lighting? It looks like the classic gray matte finish lead leaves behind.

October 25, 2008, 11:16 AM	#6
drail Junior member Join Date: February 2, 2008 Posts: 3,150	I can tell you all about GP 100 forcing cone erosion because I really abused one when I first started reloading. Speer manual said 16 gr. blue dot under a 125 gr. JHP. After several hundred rounds of this the forcing cone looked like I took a oxy acetylene torch to it. Light bullets at max velocities will cause this in time. Yours looks like very minor erosion is beginning but I wouldn't worry yet. If you're shooting a lot of hot light bullets loads you might want to back off.

October 25, 2008, 03:05 PM	#7
thetoecutter Member Join Date: November 15, 2007 Location: east of the mississippi Posts: 83	I am assuming that it looks something like this? Am linking to the pics because to an old internet guy like me they are "big" files. http://i221.photobucket.com/albums/d...3/IMG_3147.jpg http://i221.photobucket.com/albums/d...3/IMG_3148.jpg This would some idea of what >3000 .44mag 180gr JHPs sitting on top of 30gr of WW296/H110 will do to the edge of the forcing cone of a Super Redhawk. Am shooting lead now primarily (because its cheaper) but would still not hesitate to "erode" it further. I am not an expert, just a guy that likes to shoot. I am not concerned by it, figure it is the way it is... TTC

October 25, 2008, 04:58 PM	#8
under_dawg Senior Member Join Date: November 15, 2007 Location: Cayce, SC Posts: 222	Bingo! That's what it is beginning to look like. I hope those xtp's didn't do it. I'm shooting alot more low velocity lead now as well.

October 25, 2008, 06:11 PM	#9
44Magnum Senior Member Join Date: September 29, 2008 Posts: 325	If it looks like that then it is mild erosion after all.