Thread: Ballistic Calc Help

Hi all - am trying to come up with a LR solution for a new rifle. Distance I've been working at so far is 300m; the theoretical solution is 3.98MOA; actual solution is 3 MOA. Here's the details:

Rifle: Tikka t3x 7mm RM w/ Leupold vx5 3-15 (installed by Manawatu H&F)
Ammo: Hornady 162g SST
Factory MV: 3030 fps
Chrono MV avg: 2995 fps (personal chrono; has been accurate for other solutions)
Impact velocity @ 300m: ~2400 fps (Trentham targets):

Theoretical Solution @ 300m: 3.98MOA



(SST is a boat-tail ammunition but Hornady doesn't have a G7 BC so am using the G1 (https://www.hornady.com/bullets/rifl...-162-gr-sst#!/)

Actual Solution
I had a shoot at Trentham 2 weekends ago and ended up working my way down to a 3.00 MOA adjustment after shooting high and ended up with this:



And then last weekend I shot a small fallow that was sitting down at 315m using a 3MOA adjustment (also slightly uphill shot). Shot was exactly where I expected it.

I've tried fiddling around with MV, BC, Weather, etc inputs to see what bring the solution down from 3.98MOA closer to 3MOA @300m). The only one that gets it even close is adjusting the sight height from 1.5inches (which is accurate) to 3inches (which is not accurate)

I really just need to go out and shoot at 500 or 600m to validate it and hope to do that shortly but am looking for your guy's thoughts before I have a chance to do that.

Any help or thoughts are appreciated.