Originally posted by WpSniper71
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How good are you at doping winds?
I believe he did shoot a 3" group at 547 yards. I also believe if he had fired five more groups that the average group size would have opened up to 6 or 8 inches.
I recall testing a Nightforce 'Velocity Reticle' optic with a 20 inch Grendel at 600 yards. The chamber was what is known as a 6.5 LBC today. Bolt was a standard Grendel bolt. I was shooting 123 Lapua's with 30 1/2 grains of 2520 and CCI 450's.
I shot from the prone using a couple of GI sand bags under the forend and a bag under the stock. Shot five in about ten seconds, drove to the target and was stunned to see five shots in a group about five inches tall and three wide. Not only that, the group was only two inches higher than center which means the reticle actually worked for that load in terms of holding elevation.
I drove back to the firing line and waited out a condition then shot five more. Surprisingly, the second group was only a couple inches right and I believe a bit lower and the same size. Not bad for a fixed reticle pattern in 10X.
It was cold and rain at the time but not much wind.
I sheared a bolt lug on the next test I was running so that was that. At the time, Grendels sheared bolt lugs like nothing else I have seen. Today the bolts are made much better and don't seem to shear lugs as often.
I would not have bet I could have shot two consecutive groups that size at 600 and certainly wouldn't on a third try. I figure if I shot five groups of five that the average size would have been at best a minute and probably a bit more since it is a gas gun.
With one of my bolt rifles however, I would have expected under a minute at 600 given the conditions I shot in. Very little wind although a bit dark with some rain.
Bottom line, it ought to hold about a minute at 600 pretty regularly providing the wind is constant and you doped it right. Some will be bigger and some maybe a touch smaller but you won't hold under a minute every single time.
LR55
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