Most likely just the difference in plating.
I'd venture a guessd that the plating porocess on the bullets was not precisely uniform. This can also subtly alter the nose shape of the bullet, and consequently the ogive.
From what I read, the recent production Ranier bullets are not so aflicted with these problems as the older ones. People refer to "double-struck" raniers. Iy you look at the bullet base, and there si a noticible cupping effect (but well less than a hollow base,) it si the newer style. Might you have gotten hold of some of the several-years-past bullets? If the base is flat, this is likely.
What kind of load are you using? Powder and charge weight? If it is well under maximum published charge, I'd just go ahead and shoot 'em up in practice. A few thousandths difference in COL won't matter. And, if you're loading right at top charge, you'll likely have trouble with the plating stripping away anyhow.
If you do see evidence of plating stripping away (keyholing,) examine your bore carefully and make sure there isn't any gross amount of plating trhere, which might raise pressures dangerously. If so, I would clean my bore carefully, and then pull the rest of those bullets. There's such a thing as "getting away with it, but not hazardously" but it can sure become a lot of work. I would NOT fire any ammo in a bore grossly fouled with plating material.
Best of luck to you
Johnny
I've loaded some plated bullets in my Super and they shoot pretty well. But then, I don't load them very close to max. For the warmer loads, I use real jacketed bullets.
Best of luck,
Johnny
