Comp inner size - loss of effectiveness?

[D__]

How much can a comp be away from a bullet to remain effective?

I usually dremel out inner comp crud but should I just use a drill and slightly larger bit size and ream the comp out a little every time I clean it? Will this make the comp less effective it it's just a few millimeters? How tight to the bullet flight does the comp have to be? I understand going too wide can destroy the comp but what can I get away with and not worry about keyholing and such.

[eric nielsen]

It's way more important to have the cleaning done concentric to the bore vs how big or how tight you clean out the lead & carbon build-up. That's why a comp reamer is the best way to go, they're mostly 0.375" which is plenty tight on a 0.3555" bullet. The reamers have guides that go down the barrel but won't scratch the rifling. That also makes your cleaning cylindrical instead of in a cone, all the baffles get the same treatment esp. the first baffle which is typically the dirtiest.

Call around, you should be able to use a 375 rifle chamber finishing reamer. Our local smith has a 375 reamer so we stop & visit there.

http://www.brianenos.com/forums/index.php?showtopic=81872

http://www.clymertool.com/welcome.html

http://www.midwayusa.com/find?&newcategorydimensionid=1091

[g mac]

When the fouling gets bad, I just use a drill bit closes to the diameter of the bore turning it by hand just to scrape the cruds. I haven't notice any change in accuracy or performance of the gun.

[D__]

It's way more important to have the cleaning done concentric to the bore vs how big or how tight you clean out the lead & carbon build-up. That's why a comp reamer is the best way to go, they're mostly 0.375" which is plenty tight on a 0.3555" bullet. The reamers have guides that go down the barrel but won't scratch the rifling. That also makes your cleaning cylindrical instead of in a cone, all the baffles get the same treatment esp. the first baffle which is typically the dirtiest.Call around, you should be able to use a 375 rifle chamber finishing reamer. Our local smith has a 375 reamer so we stop & visit there.http://www.brianenos.com/forums/index.php?showtopic=81872http://www.clymertool.com/welcome.htmlhttp://www.midwayusa.com/find?&newcategorydimensionid=1091

Nice but couldn't I do the same with an el cheapo drill bit?

[eric nielsen]

Without a guide you'll never know if you cleared the bullet path, and probably remove too much metal. But you might get lucky.