Rough bore in Lyman GPR??

[fw707]

Anybody had any problems with a rough spot or 2 in the bore of a GPR??
The one I just built has a couple of spots about 6-10 inches from the breech face. I noticed them the first time I ran a patch down the barrel, but I figgered they would smooth out pretty quick. I've put about 30 rounds through it, and I scrubbed the mortal manure out of it this evening with JB Bore Paste, but they're still there. Not hardly as bad, but still there. It's not cutting patches, and it seems to be shooting pretty accurate, but it's just buggin' me cause I think it might be shooting better if they weren't there. :cursing:

Anybody else seen this in your rifle?

 

[Goldhunter]

Not sure. It seems I remember one in there when I first bought it, but can't remember exaclty where. I don't notice it now.

 

[J.D.]

You might remove the rought spot with section of green scrubbie. The green scouring pad available at any grocery store.

Cut a section 1 1/2 - 2 inches square, oil well, and scrub the bore with the scrubby on a smaller jag. You might have to go as small as a 40 cal jag, or smaller in a 50 cal. A 45-40 cal jag should work in a 54.

The patch needs to be as tight as possible, but not so tight that it might get stuck.
J.D.

 

[fw707]

You might remove the rought spot with section of green scrubbie.

The scrubbie helped a lot.
Thanks!

 

[Otter]

Anybody had any problems with a rough spot or 2 in the bore of a GPR??
The one I just built has a couple of spots about 6-10 inches from the breech face. I noticed them the first time I ran a patch down the barrel, but I figgered they would smooth out pretty quick. I've put about 30 rounds through it, and I scrubbed the mortal manure out of it this evening with JB Bore Paste, but they're still there. Not hardly as bad, but still there. It's not cutting patches, and it seems to be shooting pretty accurate, but it's just buggin' me cause I think it might be shooting better if they weren't there. :cursing:

Anybody else seen this in your rifle?

The green scrubbie J.D. suggested seems to have worked for you. I have used, as a matter of course in a new gun/barrel, some 0000 steel wool wrapped around a smaller cleaning jag to accomplish the same thing. Both methods are doing essentially the same thing, polishing the bore without taking a lot of metal off, and work well for me. I have done this with both my GPR's (1 - .50, 1 - .54) and they are both good shooters. When I first started shooting ML's, one shooter told me to not even worry about sight adjustment until I had shot at least 200 rounds through a new barrel - the irregularities (sharp edges and rough spots) in the barrel needed to be worn-in. Then another old timer stepped into the conversation and mentioned the steel wool (or green scrubbie) routine and said that would shorten the 200 round "rule" to a couple dozen shots. I tried it and now believe in it. Your (and other's) mileage may vary. Just don't over-do it.

 

[fw707]

Thanks Otter. :thumbsup:
I loaded the green scrubbie up with JB paste and it did a pretty good job smoothing out the roughness. The spots aren't completely gone, but they're a lot better than they were.
I've used the 0000 steel wool on .22 rimfire chanbers to remove leading and it works fine for that. I'll try it on the GPR if it doesn't smooth out with a little more shooting.

 

[54ball]

GPRs come from the factory with a type of cosmoline that is a buger to remove. Shooting the gun tends to bake this stuff on making it harder and taking it longer to wear away. It should be gone after 100 shots or rigoris cleaning like you have been doing. My bet is it is not really a rough bore but remnents of the barrel preservative. :thumbsup:

 

[Tim Clark]

There's a great write-up on firelapping muzzleloaders on the Beartooth Bullets website. (I hope I haven't breached protocol by saying that)

 

[Lone Carabiner]

3M makes the 'Scotch-Brite' pads in different grits, I've used Ultrafine and a next size down jag with good results on a rough bore. I douse it with RemClean bore cleaner also to 'slick it up' some. After hand lapping I haved to clean patch the bore 8-10 times to clean up, amazing what this procedure drags outta' thar. :hmm: