Tight bore chambered with normal diameter solid pilot?

[ImBIllT]

I'm not sure how far he is into the barrel. If some of the body has been cut, take the bushing off and continue chambering.

It was a long post. Solid pilot, not a bushing. The chamber was finished before I was informed of what had happened, and there isn’t room to start over. I just want to know if it’s a known definite problem.

 

[AckleymanII]

After examination with a bore scope, if the bore looks gouged out, there are two products used on tight fitting punch type jags that can help, but use very carefully:


Brownell's makes a product that is a paste to use as a lapping "Abrasive compound", 600 & 800 Grit Silicone carbide.

600 grit Abrasive Compound: product # 083-045-600

800 grit Abrasive Compound: Product # 083-045-800

All I would want to do is smooth up the rough edges that have been gouged out from the oversize pilot. Then shoot the barrel and see how it shoots. Use these sparingly, take your time, inspect with bore scope frequently as these products remove metal.
You can RUIN a barrel with these two products, focus on the portion that is gouged out.

A picture would be helpful.

 

[sdean]

If only the chamber hadn’t been finished.

Don't pass judgement until you shoot it. Good luck..

 

[butchlambert]

I don't believe he said the chamber was toast.

 

[hoz53]

It was a long post. Solid pilot, not a bushing. The chamber was finished before I was informed of what had happened, and there isn’t room to start over. I just want to know if it’s a known definite problem.

once i had a barrel that didnt have enough diameter to cut the tenon off and still have a shoulder. this was on a remington- it did have enough diameter to thread it though so i used a Nut. It worked- it was just a factory barrel so it wasnt worth putting any $ in- i just wanted to see if i could do it. Now that barrel is on an AR 15 - i usually make barrels that arent good for anything else ar15 barrels before they become tomato stakes

 

[ImBIllT]

I don't believe he said the chamber was toast.

No, no one has told me that it was toast. The chamber looks perfect. It’s just that there is something that the pilot has done ahead of the throat that is visibly different from what the portion of the lands that the pilot never touched. I intend to shoot it before passing final judgment. I’m just wanting to know if it is known that this will cause problems, so that if the gun doesn’t shoot, it’s safe to assume that is the reason, or safe to assume that something else is the reason.

 

[ImBIllT]

once i had a barrel that didnt have enough diameter to cut the tenon off and still have a shoulder. this was on a remington- it did have enough diameter to thread it though so i used a Nut. It worked- it was just a factory barrel so it wasnt worth putting any $ in- i just wanted to see if i could do it. Now that barrel is on an AR 15 - i usually make barrels that arent good for anything else ar15 barrels before they become tomato stakes

I would go ahead like you say if it was just cosmetic. The headstock on my dad’s lathe won’t allow a very large diameter barrel out the back side, so if it isn’t a sporter contour, he chambers with a steady rest on the tenon. His particular steady rest requires almost 1/2” flat area, and the shrinking tenon is putting the rest of his tooling quite close to his steady rest while cuts the threads. This morning he decided that if it just shoots like crap he MIGHT be able to squeeze things in just tight enough clean up the area where to pilot was rubbing.

 

[hoz53]

I would go ahead like you say if it was just cosmetic. The headstock on my dad’s lathe won’t allow a very large diameter barrel out the back side, so if it isn’t a sporter contour, he chambers with a steady rest on the tenon. His particular steady rest requires almost 1/2” flat area, and the shrinking tenon is putting the rest of his tooling quite close to his steady rest while cuts the threads. This morning he decided that if it just shoots like crap he MIGHT be able to squeeze things in just tight enough clean up the area where to pilot was rubbing.

ok i hope it all works out

 

[AckleymanII]

I don't believe he said the chamber was toast.

Butch, I was referring to a possible large burr raised up the the over size solid pilot in the bore.

 

[Dusty Stevens]

After examination with a bore scope, if the bore looks gouged out, there are two products used on tight fitting punch type jags that can help, but use very carefully:


Brownell's makes a product that is a paste to use as a lapping "Abrasive compound", 600 & 800 Grit Silicone carbide.

600 grit Abrasive Compound: product # 083-045-600

800 grit Abrasive Compound: Product # 083-045-800

All I would want to do is smooth up the rough edges that have been gouged out from the oversize pilot. Then shoot the barrel and see how it shoots. Use these sparingly, take your time, inspect with bore scope frequently as these products remove metal.
You can RUIN a barrel with these two products, focus on the portion that is gouged out.

A picture would be helpful.

You can buy this at your local big box auto parts store. Its called valve grinding compound and comes in a twin pack of mini toothpaste tubes like jb weld tube size. Very cheap there

 

[Will Henry]

I missed the part where he said the chamber was .350 shy of being finished. I would definitely hone the pilot down, then finish the chamber. Reduce the pilot by spinning it in the lathe, on centers, and dress the pilot with a diamond file or hone. Finish with a ceramic stone. .350 is probably not enough for the reamer to clean up all of it but it will get some of it. Then you can lap the rest. WH

 

[ImBIllT]

I missed the part where he said the chamber was .350 shy of being finished. I would definitely hone the pilot down, then finish the chamber. Reduce the pilot by spinning it in the lathe, on centers, and dress the pilot with a diamond file or hone. Finish with a ceramic stone. .350 is probably not enough for the reamer to clean up all of it but it will get some of it. Then you can lap the rest. WH

I included too many unnecessary details. He informed me that it was tight while about .350” out. He completed it before he figured out why it was tight. The thing is complete.

 

[Will Henry]

It might be best to put me on "ignore"! I think I'm just adding to confusion. WH

 

[ImBIllT]

It might be best to put me on "ignore"! I think I'm just adding to confusion. WH

I’m the one causing the confusion. I tend to include too many unnecessary details.

 

[jdh47]

I'd just send the reamer out and have it made piloted and buy an appropriate pilot for it. You're probably fine. That's the problem with solid pilot reamers. Sometimes they fit and sometimes they don't. Good Luck.

 

[Alex Wheeler]

A bore rider or +p throat intentionally cuts away half of the land in front of the normal throat then has a small lead to finish it out. You may have something close now. If the lands are not flattened out and wider than they started it will likely shoot fine. Since you are talking .0005" over sized you may have only tore off .00025 on each land. Not ideal, but as usual listen to the target.

 

[MDSpencer]

I could take .0005” off that pilot for you. Put your reamer on one of my OD grinders.

Mark