Thread: 1 shot groups (cold bore challenge)

A few remarks fwiw.
Cold clean bore may not show much deviation at 100m but I've definately seen variance at 500m.
Holding a rifle tight, which may occur at first shot, can actually increae velocity and send shot high.
Tighter or looser pressure on forend hold or rear position support will affect poi, again, more noticable at longer ranges.
Wet cartridge will increase pressure and increase group size.
A 2mm rise in muzzle of a 24" barrel will cause 15" high shot at 500m.
Etc.
So there are a heap of potential variables, some of which will not be very obvious at a short 100m.
Then there is the issue of bbl and load harmonics vs ambient temperature effects varying by day and time of day, light conditions, mirage, wind et al..
In short, consistent cold bore shot ( in the field ) precision is unlikely to ever be as good as a range zero or group.