300 wsm Ballistics help

[Don Fischer]

Hey all, Hoping someone would have a good answer for me about some mid-range ballistics.

Situation: I'm shooting a Savage 110 Ultralite 300wsm (1:10 twist) with a Omega300 sup. and pairing that with Federal Terminal accent 200gr. I've chrono'd my rifle and averaging 2804 ft./sec. (ammo box states 2810) using both the Hornady ballistics app and the vortex LR calculator to get a dope but the calculation results are not correct. see below for calc

Hornady Ballistics calculator (Vortex calcs within .1 MOA)
100yd - 0 MOA
200yd - 1.31 MOA
300yd - 3.51 MOA
400yd - 6.09 MOA

But data from actual shooting at the range is telling me the following:
100yd - 0 MOA
200yd - .8 MOA
300yd - 1.65 MOA
400yd - 3 MOA

am I missing some big factor on the ballistic apps? I'm consistently hitting a 4" plate with a 3MOA adjustment when the calculators tell me 6+ MOA... I'd like to trust the app so that I can make adjustments in the field out to that 500-600 yard range. Thanks for your helpful knowledge in advance! - Ryan

I think you'll find different rifles, even same brand and model may handle the same loads differently. Simply find a load that your rifle likes best.

 

[razorrt5]

The problem has been solved. I was running through all the things for what felt like the 1000th time when I realized the chassis was loose, giving the barrel some bounce. I tightened it up, and now it's shooting as it should be. I appreciate all the input from everyone. happy hunting!

 

[ImBillT]

I still feel like more than just the chassis is wrong. Perhaps that was all it was.