Thread: Throat Erosion - New Barrel

Originally Posted by GWH

Going from .4 inch to 4 inch after 200 rounds, id also suggest its a carbon problem, as ive experienced similar big change in grouping, and after trying everything else to no avail, polishing out the carbon got me back to .5 moa.

Get some autosol on a patch and polish it back and forth, focus on one third of the barrel length at a time, just be careful you dont pull it back thru the muzzle.

You could change the patch for each third and add more autosol polish on each one.

Then after polishing give it a normal clean with your normal chemical to flush out the polish and carbon residue.

Id try this first and test shoot.

JBs is fine but please please not autosol!!

Originally Posted by omark

JBs is fine but please please not autosol!!

Why? JBs is more aggressive than Autosol.

I'll tell you a little story about Autosol. My NRA target rifle had a 30" Krieger bbl and it shot moly'd 155 Sierras with great accuracy at 2950. Here was the cleaning regimen that never varied. With a patch wrapped round a worn .270 brush, Autosol was lathered on and run back and forth through the bbl for 8-10 strokes. Repeated this, then wiped out with a clean patch. At over 3000 rounds, we had a look with a borescope and there was no visible rounding off of the lands and the bore was bright and squeaky clean. At a documented 5000 rounds, I decided to shoot it over a benchrest as I suspected it might have gone off the boil. It produced a 5-shot group of sub half inch. The accuracy finally went to pieces about 400 rounds later but you'd be hard pressed to convince me the barrel was ruined by Autosol.

It was in fact Steve Blenkarne ( the orig owner of Truflite) that suggested it to Tony Halberg and I adopted the method. Steve used it all the time apparently.

Originally Posted by 6x47

Why? JBs is more aggressive than Autosol.

I'll tell you a little story about Autosol. My NRA target rifle had a 30" Krieger bbl and it shot moly'd 155 Sierras with great accuracy at 2950. Here was the cleaning regimen that never varied. With a patch wrapped round a worn .270 brush, Autosol was lathered on and run back and forth through the bbl for 8-10 strokes. Repeated this, then wiped out with a clean patch. At over 3000 rounds, we had a look with a borescope and there was no visible rounding off of the lands and the bore was bright and squeaky clean. At a documented 5000 rounds, I decided to shoot it over a benchrest as I suspected it might have gone off the boil. It produced a 5-shot group of sub half inch. The accuracy finally went to pieces about 400 rounds later but you'd be hard pressed to convince me the barrel was ruined by Autosol.

It was in fact Steve Blenkarne ( the orig owner of Truflite) that suggested it to Tony Halberg and I adopted the method. Steve used it all the time apparently.

Yep i agree, the autosol treatment was also first recommended to me by a very experienced top target shooter too, i'll keep using it, as it works. I've tried the CLR on one problem barrel i have here and it left some strange marks in the surface of the bore, i think ill be leaving that stuff for Eric.

Originally Posted by 6x47

Why? JBs is more aggressive than Autosol.

I'll tell you a little story about Autosol. My NRA target rifle had a 30" Krieger bbl and it shot moly'd 155 Sierras with great accuracy at 2950. Here was the cleaning regimen that never varied. With a patch wrapped round a worn .270 brush, Autosol was lathered on and run back and forth through the bbl for 8-10 strokes. Repeated this, then wiped out with a clean patch. At over 3000 rounds, we had a look with a borescope and there was no visible rounding off of the lands and the bore was bright and squeaky clean. At a documented 5000 rounds, I decided to shoot it over a benchrest as I suspected it might have gone off the boil. It produced a 5-shot group of sub half inch. The accuracy finally went to pieces about 400 rounds later but you'd be hard pressed to convince me the barrel was ruined by Autosol.

It was in fact Steve Blenkarne ( the orig owner of Truflite) that suggested it to Tony Halberg and I adopted the method. Steve used it all the time apparently.

Steve used it to polish his new barrels, he always recommended it.

Originally Posted by tetawa

Steve used it to polish his new barrels, he always recommended it.

Yes he did, I spent a lot of time at Steves place the north shore all his barrels were polished with Auto Sol, He recommend that
barrels were Auto sol'ed when new it helps with copper fouling, It has with my barrels, I saw him run a new barrel in a a championship
match at Te Puke rifle club , fire 10 shots clean at 300 yds repeat at 500 and 600 job done.

Originally Posted by shooternz

Yes he did, I spent a lot of time at Steves place the north shore all his barrels were polished with Auto Sol, He recommend that
barrels were Auto sol'ed when new it helps with copper fouling, It has with my barrels, I saw him run a new barrel in a a championship
match at Te Puke rifle club , fire 10 shots clean at 300 yds repeat at 500 and 600 job done.

Every new barrel I get has a quick touch up with Autosol, whether brand new or used. The only exception being my Bartlein, which are factory lapped. My rifles all get the Autosol treatment every 200 rounds. An old brush with an Autosol soaked patch wrapped around it is pushed back and forth through the throat area 20 times and 10 times through the remainder less the last couple of inches. I am convinced this slows erosion and it also makes copper removal much easier.