Practice sessions for me are six 5-shot groups, shooting continuously over a period of 30 minutes. I am trying to mentally and physically simulate (FTR) match conditions, no break, watching wind, executing and trying to note errors when I make them. The barrel gets hot, way too hot to hold onto, but it needs to be able to tolerate that and keep delivering half MOA.
I then rest a few minutes, switch rifles and shoot more. After the FTR gun has cooled some, I will shoot it again. This is after being hammered by the other rifle, a .300WSM; afterwards I can check myself for recoil shyness with the 308. I always let them cool before I put them back in the case, they're hot as blazes.
No brakes.