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I've seen POI/group changes when changing from brand to brand or from LR to LR magnum. Very little or no perceptible change in primer lot numbers. But then I got into exclusively using CCI #200. I guess my skills at the range were never precise enough for me to see differences from lot to lot. I would suspect that something else "additional" also contributed to the change you see. What was the sample size that gave you the 3/4MOA and the sample size that gave you the 1 1/2MOA. I was always able to buy my primers in cases of 5000 so I usually got same lot numbers.
That works, if you can get them in 5000 lots. Remember you can only store 10000 primers in your reloading area. In a car you can have as many as you want. ATF rules. Don't ask me why. Especially now with it being almost impossible to get LRP in more than single brick at one time. Just getting getting one brick in different primers can take up the 10,000 prmers in just LRP, now get into Shotgun, and SRP, and Pistol primers.
Right, as if supply challenges aren't enough to deal with. Coloring within the ATF guidelines adds to the complexity. I got lucky recently while on a trip to a relative in Central Pennsylvania. An LGS up there had Remington 9 1/2's on the shelf at $74 per brick, 5 brick limit. I got my five, should last me for as long as I need primers. All my original loadings were with CCI200's. My new loads with the Remington s shoot to a different POI, 1" lower. Since I zero at 2" high at 100yds I'm completely happy with the results. I'll take luck every time.
If you are questioning me, the original CCI200 load consisted probably of 240 rounds. The load with the Remington primers stands currently at 90.
The question was for the OP.
