It's not uncommon for production jacketed bullets to be under groove diameter and for production barrels to measure around .001-.0015 larger. Sometimes up to .002.
The composition of the bullet also plays a role.
A 1inch mic will tell you about the bullets, a lead slug will about the bore.
I'd like to get my hands on a 22 High Power; I think its maligned because it has been jacked with bullets that aren't adequate for twist, die and brass irregularities and bullets used as an afterthought.
It's like the 45 Colt of rifle cartridges.
