30-06 hunting Ammo

1
I got a deer tag this year so I went to the range today to make sure I had the rifle zeroed. I have a CZ 557 in 30-06. I had some Winchester XP, one box with 150 grain bullets and another box with 180 grain bullets. These have a polymer tip. I had terrible results with both! POI was 6” low at 100 yds, with a big 10” spread. I thought I must have the scope loose in the rings or something.
Just for fun I put 3 rounds of M2 ball in the rifle. Perfect! Then I tried my actual solid copper rounds (non-lead ammo in CA) and that was perfect as well.
Anyone have an idea why the XP ammo was so terrible?
Aim past the target.

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Re: 30-06 hunting Ammo

5
My CZ 452 is definitely sensitive to bullet types, with the best results coming from the solid copper bullets- but even with the worst bullets, didn't have that kind of extreme spread. Hitting low isn't abnormal given the different powder, but the spread would definitely make me look to a different brand.
“Do the best you can until you know better. Then when you know better, do better.”
- Maya Angelou

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