BC Calculator help

[LRRPF52]

I'm trying to get some data for my rifle but I'm getting some different results when I use Hornady 4DOF and my Kestrel 5700 ballistics model (non elite). At 200 and 300 they're the same click value but by 400 they start to deviate. I'm using Hornady Black factory ammo @ 2477 FPS (chrono'd today from a MS3), 88 degrees, 471 ft elevation, 18" LaRue 1:8 twist barrel and 2.63" scope height over bore. I'm using a G7 BC of .247, and that's off of Hornady's site to account for the slower moving bullet. I have the same wind conditions entered for both.

4DOF gives me:

200: 1.92 MOA
300: 5.05 MOA
400: 8.84 MOA
500: 13.25 MOA
600: 18.12 MOA

Kestrel gives me:

200: 1.86 MOA
300: 4.87 MOA
400: 8.47 MOA
500: 12.58 MOA
600: 17.23 MOA

Does anyone have any dope for similar conditions that I could compare to? FWIW, when I use Hornady's regular BC calc (aka non 4DOF version), I get the same data as the Kestrel.

Convert all your drop and drift data into a practical, usable format. Is it clickable or can you hold to that decimal?

200: 1.92 MOA = 2 MOA
300: 5.05 MOA = 5 MOA
400: 8.84 MOA = 8.75 MOA if you have 1/4 clicks, 9 MOA for half MOA clicks
500: 13.25 MOA = 13.25 MOA for 1/4 clicks, 13 MOA for half
600: 18.12 MOA = 18 MOA

Kestrel gives me:

200: 1.86 MOA = 1.75 or 2 MOA
300: 4.87 MOA = 4.75 or 5 MOA
400: 8.47 MOA = 8.5 MOA
500: 12.58 MOA = 12.5 MOA
600: 17.23 MOA = 17.25 or 17 MOA

What's .75 MOA difference at 600yds? 4"

If you have an MOA reticle for holds, you're looking at 2 MOA hashes on most of them.