Congrats. What's the rifle only weigh? Is the 19 heavier than a 2B? Website did not show #, but thicker muzzle OD. .66 vs .63
I built two 260's on Bordens and McM in the past using the Rem Mag at around 23.5 and 24.5.
Re cold temps, seems the Finns get cold weather in their country.....much research was surely done.
