Guys I was wondering how accurate you have found jbm trajectory simplified calculator to be. The reason I ask is I was in the process of getting my load doped and with a 100 yard zero I found the 500 yard come up to be right at 9 inches too high. The groups were right at 3 inches the load is a .338 lapua 300 smk at a chronied 2685 av. Rifle is a stock remmy w 5.5x20 nf. My previous longish range shooting was typically done w the ballistic recticle scopes., so the dialing in is new for me. Any help is appreciated.