Thread: Tikka T3 .270 COL reading .005" off standard COL

Greetings @Westie,
I usually seat my projectiles at 1mm short of the rifling or maximum for the mag whichever is shorter. This assumes adequate seating depth. Even with that the COA needs to be adjusted or at least checked with each new batch of projectiles as they do vary over time. There have been some significant changes with some of the Interlocks I have been using Many measure to the projectile ogive rather than the tip of the projectile which is likely to be more accurate but I have not made the switch as yet. I pay very little notice of the book value for COA rather working to mag length or distance to lands.
You will get a better idea of COA with the cleaning rod method rather than chambering a test round as you did and there are lots of fancy pieces of kit that yo can use as well. I haven't bothered with those either.
Regards Grandpamac.