Range results

[Xiph0id]

So I was at the range not long ago putting my rifle to the test and getting some real numbers.

For years, I relied on the numbers on the box to be close to accurate but never really considered shooting past 250 yards or so due to not knowing for sure.

While at CHAS range I noticed the following.

Shooting a Weatherby Vanguard 2 chambered in 257 wby mag.
Using Nosler 110 brand ammo accubonds 110 gr bullets.

Fired several at each of the 100, 200 and 300 benches.

Zeroed at 200

Box says I should be 1" high at 100 and 5.1" low at 300
Actual is 1" high at 100 and 10" low at 300


Now I know you can never rely on on published data and the only way to know 100% is to shoot at a range but is this normal variance from box data?

Also, side note, grouping at 300 is tough! I can do 1" groups at 100 most of the time, but at 300 is tough. To the guys that shoot 1/4" - 1/2" MOA, congrats.

Thanks.