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I started typing up a post with all this and other variables but didn't want to bamboozle the O.P :yaeh am not durnk: there are so many many things....every time i think i have my system down to a...

Find a stable es charge and providing it shoots good groups varify velocity by shooting at longer ranges and calculate velocity by using the drop.

Many many things.....
If using an optical chrono take the velocities with a grain of salt. The results are often consistent but rarely accurate. They are good for identifying ES(velocity spread for...