Thread: POI shift when a barrel gets heated up?

Sako 85 are spec'd for 5 shots moa and I can't see it stated different for the A7. TRG42 in 308 is 0.5 moa x5 shots while the 44 in 338LM is back to 1 moa. . Tikka guarantee only 3 shots moa. However the A7 is one factory barrel that you can count on to shoot a string and probably a lot more than 5 shots actually.

Likely reasons for initial close shots then spread are:
Random spread when your system/personal group is bigger. It's easy to get a sub string of 3 touching (with this rifle) but over many shots the total group size is a bit larger. Still all good though.

Loose scope, mounts, bedding screw, suppressor,

Change in rest and sandbag use. Variable shooter technique eg changes position or hold as you fire more shots. If you have parallax adjustment that needs to be set for the distance you re shooting over.

Change in ammo batch. Dirt, water or heated cartridges.

Change in barrel fouling. Try cleaning for carbon and use a bronze brush every 10 rounds if it's a new barrel up to 100 round count, then for copper between sessions leaving bore tech eliminator in for 30min. Dont use Sweets copper solvent if new rifle.