Thread: chrony on factory loads

Hi All, i havent shot factory ammo for 15yrs but got asked to sight in a friends rifle for him, i thought while i was at it id run the loads over my labradar, its a remington 783 in 243 shooting winchester super x 80gr projectiles. the box says 3300 ish and my radar says 2740.... it wouldnt surprise me to be 100 or so out but 600fps almost??...

could i suspect its old degraded ammo or a slow short barrel? my labradar reads what i expect on all my handloads so i dont think it would be that.

Interested to hear what others have experienced.