New boy on reloading. I was advised to buy another toy - a comparator. I see the OAL using this tool in the calipers gives 8 thou more for factory ammo (Norma 100 gr SP semi pointed) to the ogive than the measurements I took using my Hornady OAL gauge measurements, i.e. 2.204'' vs 1.196'' .
I am using Nosler partition Spitzer 100 gr in 243.
I test fired the original measurements and got - 1MOA.
If factory ammo is meant to have a tolerance of 50 thou and I was working on 20 thou, there seems to be an abnomaly.