Depends on your cadence of fire too. In high power matches it is common to shoot a 20 shot group. But up to 20 minutes is allowed. 10 shot groups in 60 or 70 seconds are common too.
A good barrel won't walk much at all, some go all over the the place. I have never been impressed with Rugers in this regard. My gov profile ( light under the hand guard) and light weight profile ars, and Garands with Criterion barrels hardly shift.
I have a new production 30-06 M70 Sporter (walnut) that seems impervius to heat, at least to 10 rounds. I shoot it in some local matches that include 2 strings of 10 rounds in 60 seconds (sitting) and 70 seconds (prone). It holds a nice small round group at 100 yards. I can't tell you an exact size it will do as I am shooting in full panic mode to get the shots off, reload (without a striper clip) and get the remaining shots off in time, but it is quite respectable under the circumstances.