Problems installing choke on Rossi 410 single shot

[coyotebgone]

I have done a TON of choke installation. I have run into the first of its kind.

Rossi 3" 410 Barrel fixed choke. During Reaming of barrel 40 RPM Plenty of Tacki Lube, same as always. Hand hold barrel while reamer held by 4 jaw and back of barrel held by mandrel in live center.

During threading: hold barrel in vise and hand thread using ptg tooling

While reaming the barrel the metal seemed gummy and would just grab. Not a uniformed ream. Then when threading instead of grabing the metal and threading into the barrel the threads would chip out.

Thought, to myself must be crazy. Try again another day. Cut back barrel, since now its too short. But repeat above steps. Same results

I have checked my tooling all sharp and new. Do you think there could have been something wrong with the metal alloy? Anyone else had any problems with a Rossi?

Thanks for the input.

 

[Donal]

New is not always sharp enough to cut. did you measure the diameter of the bore before reaming and afterwards? Did you measure the diameter of the reamer? Gummy and not a uniform ream, indicates no cutting action was taking place. The alloy is strong and tough. Thin barrel may be stretching and returning to near its original diameter. Do you have a go-nogo gauge for the desired diameter? do you have a fixture to mount the barrel in a 4 jaw chuck and bore the diameter? Was the reamer a right hand reamer?