deeper grooves?

[westrayer]

I was talking with a knowledgeable guy, and he said that he got better groups with his stock guns if he had the grooves deepened a bit.
Anyone else find that? How much accuracy did you gain? My Deerstalker cap and T/C flint shoot OK with patched RB, but they could do better.

 

[wiscoaster]

I didn't even know that could be done, so if you get any info on how, who, where and how much, please post. Thanks.

 

[centershot]

How is that even possible??

 

[Grenadier1758]

Historically, gunsmiths had freshening rods with a cutting bit that followed the groove to clean the fouling and rust from the groove. It was one groove at a time and a fair amount of labor.

https://www.muzzleloadingforum.com/...loader-get-cleaned.176156/page-2#post-2551958