after getting my load right (51.5g H4831sc/ Lapua Brass/ 140g Berger VLD hunting @ 2750fps) in my Cooper 24" 1 in 8 barrel. I am making my drop card, using shooter app. and JBM program. Both gave me the same values . With a 200 yrd zero they give me a 300 yrd drop of 2.4moa (10 clicks) Vortex 4-16 PST on MOA. Problem is when I shoot this I end up 2.5" low at 300. I shot two 3 shot groups then switched to 3 MOA (12 clicks) and was shooting dead center. groups were all very good for me .6 to 1.75" at 300. Any ideas on the difference in the programs and actual results?