After cruising the forums I thought this might be a good place to ask this question. I have shot 150 gr. remington express core lokt for 10 years out of my Remington 760 in .308.This year I am baffled as the older stuff puts them in there to 1.25" at one hundred yards as always. I bought 2 new boxes and they wont group any better than 5" at a hundred. I put the old back in without ever touching the rifle and its dead on. I am familiar with the different lot numbers but wow 5" ? I am finally going to purchase a high end rifle next year. Probably in .270 win and I want to get all I can out of it. So here's the question, Is that common for factory loads to vary that much? if so I need to buy a press pronto. Any input is appreciated. I am very new to most of this as I have never been able to use my .308 here in N.Y. for Deer until this year. Heck my Ihaca Shotgun can beat 5" at a hundred yards. I should add, the rifle shoots them all around the bull, nowhere in particular just 2.5" out of dead center to either side, up, or down. Thanks Doug.