will the inserts of this thing damage the rifling or crown when inserted into the bore?
Yes every time no matter the bore size.....
(comes with free anti bore damage warranty - does not include accidental damage caused by dopey australians who drink too much fosters)
Cheque in post. I probably won't need all of the mandrels as I thought that I would just beat the .30 cal one into my smaller rifles with the back of my axe, what harm can it do? (please send the others anyway?) JC