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How to tell if a Chrony is giving good numbers?
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<blockquote data-quote="remingtonman_25_06" data-source="post: 140127" data-attributes="member: 1403"><p>AJ- I dont know if you followed my post on 140g NBT at 800 yards out of my 7 RM, but I"m shooting about 3.5 MOA low at 800 yards. Now this could be due to several things, but I worked them all out that 1 day at the range. Like you, I have the cheap Crony, it gives what I thought consistent readings with good laods. This particular load averages 3250fps, this is about 3-4 differnt trips. With 3250fps and a .485 projected BC, I was hitting 3.5 MOA low at 800 yards. That just did not seem right to me. For that to happen, My velocity needed to be either 3075, or the BC of the 140g NBT was .350, and I highly doubt that. I was also told it could be my scopes click value was not really .250" but I later confirmed my scope was indeed true .250". I dialed 20 MOA up from 100 yards and shot at a big piece of paper. I should have been 20" high, well I was 20.5", close enough, problem solved there. Next I was told to zero at 100 yards and shoot 400 yards. According to ballistic program, I should be 20" low at 3250fps and .485 BC. Well I shot a nice little 1.1" group at 400 yards that was right at 23" low. So as you can see, its already off a couple clicks at 400, and about 14 clicks off at 800. Im thinking that my velocity is only 3075 because at 400 and 800, it matched up perfectly with the .485 BC. I need to look at getting a new cronograph as well. This could mean all my velocities are off. It could also explain why I'm always shooting at least 2-3 MOA low at 800 yards. I'm about 99% sure its my cheap Crony. I dont know anybody else around here with a Crony to verify either. Guess I just need to pony up the dough and get a better one. How are the PACT cronographs???</p></blockquote><p></p>
[QUOTE="remingtonman_25_06, post: 140127, member: 1403"] AJ- I dont know if you followed my post on 140g NBT at 800 yards out of my 7 RM, but I"m shooting about 3.5 MOA low at 800 yards. Now this could be due to several things, but I worked them all out that 1 day at the range. Like you, I have the cheap Crony, it gives what I thought consistent readings with good laods. This particular load averages 3250fps, this is about 3-4 differnt trips. With 3250fps and a .485 projected BC, I was hitting 3.5 MOA low at 800 yards. That just did not seem right to me. For that to happen, My velocity needed to be either 3075, or the BC of the 140g NBT was .350, and I highly doubt that. I was also told it could be my scopes click value was not really .250" but I later confirmed my scope was indeed true .250". I dialed 20 MOA up from 100 yards and shot at a big piece of paper. I should have been 20" high, well I was 20.5", close enough, problem solved there. Next I was told to zero at 100 yards and shoot 400 yards. According to ballistic program, I should be 20" low at 3250fps and .485 BC. Well I shot a nice little 1.1" group at 400 yards that was right at 23" low. So as you can see, its already off a couple clicks at 400, and about 14 clicks off at 800. Im thinking that my velocity is only 3075 because at 400 and 800, it matched up perfectly with the .485 BC. I need to look at getting a new cronograph as well. This could mean all my velocities are off. It could also explain why I'm always shooting at least 2-3 MOA low at 800 yards. I'm about 99% sure its my cheap Crony. I dont know anybody else around here with a Crony to verify either. Guess I just need to pony up the dough and get a better one. How are the PACT cronographs??? [/QUOTE]
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