Originally Posted by Lefty7mmstw
Just shoot them. Basically as long as it takes to target the rifle.
WEll, I'll throw in my hat, but am sure some will disagree. IF I am shooting a standard mag contour, I only shoot two shot groups. BUT I shoot a series of two shot groups, on the same target, after a cool down period. ( assisted by air conditioner in truck if need be). Now, if it is a sendero contour, I will shoot three.
This is my theory. Take for instance, my Sako, or the Winchester. They have a normal contour barrel. Two shots in 60 ish degrees, using RL25, and you can barely touch the barrel after two shots, let alone three. And usually, because of that, the third is usually a flier, or way out of the group. Which in turn, may make you discount that load, even if the first two are touching. So, if you take a series of two shot groups, and they stay consistent, you have found your load, you didn't fry the throat. AND, here is the frosting on the cake! I have two rifles sighted in exactly like that. The first and second shot are on the money, dead on the money at 250 yards.
With the Sendero, they can handle the heat a little better, due to nearly twice the surface area.
That's just my .0002 cents, but it works for me, and I have checked and counter checked my reasoning over and over again. The targets don't lie!!!!