| Nakihunter |
| (.375 member) |
| 14/04/08 10:11 AM |
|
Re: Sempert & Krieghoff Drilling Trumpf
|
The 7.8mm is the bore diameter (roughly 0.308) & the groove should be another 0.008 to 0.010 inch - which makes it a 0.318 cal. It is very useful to slug your bore & make sure. These old guns often had over sized bores. How good is the accuracy?