Good morning!
I am about 2 years into my gunsmithing business and I am still learning a lot. I have a customer that wants to ream a 40 S&W cylinder on a Ruger vaquero old model to 10 mm. He states that the barrel is good to go. Honestly, I do not know where to start. I have found a couple of articles where folks are using a 10mm finish reamer on the cylinder. Reaming is new to me so any advice will be greatly appreciated.
Thank you!