I reckon you should strive to match the groups that you shoot at your zero range, at all ranges. Therory of the group applys of course. I have shot a few groups at 700 and beyond that puts a smile on my face but so far havent managed it everytime. Usually my fault as well. Wrong Data inputs or forget to input/note a change the conditions dictate.
I dont really worry as long as I try to do my bit and make the first one fall in my expected MPI.
It was better when the Queen paid for me to muck around with heaps of ammo.
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