I've seen either the V2 or V3 Version used in Leek tunnel on SR's 308 FTR rifle and the poi moved around an inch or just over . Strange how we all do things in a different way as when I load develope , I have a bullet and powder that I intend using and a velocity band that I need to be within . Once I'm around the middle of the band , I then try to make it group with good spreads so I couldn't load develope without using a chrono from start to finish . These barrel fitted chrono's whilst being useful and easy would put a doubt in my mind during load development so not for me .
I've collected a Labradar today for which i can see all the plus points of the barrel mounted but without the doubt issue ..... Hope i haven't just give it the kiss of death !
OSOK