Thanks for the replies guys.
Riffe is a Tikka M55, with a adjustable target stock, ( weighs a ton!)
Usage exclusively target.. barrel I was told is a 1/12, but the internet seems to think its a 1/14, and when i try to messure it seems to be somewhere between the two?
As a beginer Im more interested in the learing the mechanics of reloading and load testing rather than absolute accuracy.