Greg if you are talking about the type of reamers in the photograph, I would not in any circumstances use this type of reamer for a gun bore. This type of reamer I know as a Repair reamer sometimes called a "spill bore reamer" on this side of the pond used to adjust motor pulley bores and hole sizes because of their construction they are not truly round because the cutting blades and the slope the blade runs in the reamer body are cut separately and not ground true as one unit because of its design. If you try to ream a a long bore the reamer will wander also their finish leaves a lot to be desired. These reamers are quick fix engineering items and work extremely well for what they where designed for.


[Linked Image from i.imgur.com]

The only lessons in my life I truly did learn from where the ones I paid for!