i know there is a way to calculate fps base on point of impact but am unaware of either a program or a formula to do it. it would be awsome if there was a section on jbm or some other free sight to calculate it that i can not find. any idears? i searched for a wile but got lost in jiberish......
Chronograph alternative / confirmation?
- Thread starter huntinggamo
- Start date
Re: Chronograph alternative / confirmation?
Use JBM, and plug in your exact conditions and work backwards. Insert all the EXACT enviromental conditions and rifle/ammo specs (including scope height) when you were shooting, and alter the fps til it equals your known drop. It's hard to get it 100% exact, but it should get you close enough. if you have known dope past 600 yards, it will help the most.
Use JBM, and plug in your exact conditions and work backwards. Insert all the EXACT enviromental conditions and rifle/ammo specs (including scope height) when you were shooting, and alter the fps til it equals your known drop. It's hard to get it 100% exact, but it should get you close enough. if you have known dope past 600 yards, it will help the most.
Re: Chronograph alternative / confirmation?
I find I usually work backwards half the time anyway to tweak around with drop charts, to get them just right
I find I usually work backwards half the time anyway to tweak around with drop charts, to get them just right
Re: Chronograph alternative / confirmation?
Matt - you're going to have to "tune" any ballistic program to get results which closely match your shooting results. For reasons why, see Sources of Ballistic Program Inaccuracies.
Matt - you're going to have to "tune" any ballistic program to get results which closely match your shooting results. For reasons why, see Sources of Ballistic Program Inaccuracies.
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