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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
calculations 2moa off, need advice
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<blockquote data-quote="cowboy" data-source="post: 398692" data-attributes="member: 8833"><p>[QUOTE</p><p>Possible problems I can think of:</p><p>The bullet is traveling faster than I think</p><p>The range is shorter than I think</p><p>The adjustments on the optics are not accurate</p><p>My shooting form</p><p></p><p>Any more Ideas?</p></blockquote><p></p><p>You are on the right track in analyzing your problem. Could be any or combination of any of the above mentioned. Can you verify your velocity by borrowing another chronograph. My chronograph is consistently reading 30-35 fps too slow but is within the manufacturers plus or minus acceptable reading. Can you borrow a range finder to verify your velocity. I always check the adjustments on any scope - you would be surprised at the results. Assuming ammo comes from same lots of powder and primers as shot across chronograph - what do you get for readings of avg. velocity, extreme spread and standard deviation. How many rounds are you shooting to determine that you are .5 to 2 MOA high. Also - when you get .5 to 2 MOA high is this out of a cold clean barrel versus 2-3-4th shot or slighly fouled barrel?? Does your area get much barometric pressure differences - although at 4-5 hundred yards this shouldn't cause a great difference. How much difference does your rifle show between a cold or clean barrel versus having fired with a slightly fouled barrel. I have one rifle that after you clean it you better send about 4 rounds out the window before you do any analyzing or you could drive yourself nuts. Good news is that it seems like you are getting consistent results from actual to theoretical. </p><p></p><p>Aside from all the above - the most consistent problem I have found from programs to actual is the bullet manufacturers published BC's. If your velocities are correct etc. try playing with the BC input to match your actual shooting data and see what you come up with. Do not assume that published BC's from bullet manufacturers are nuts on. A couple manufacturers are pretty good and some are very under on what they are published.</p><p>[/QUOTE]</p>
[QUOTE="cowboy, post: 398692, member: 8833"] [QUOTE Possible problems I can think of: The bullet is traveling faster than I think The range is shorter than I think The adjustments on the optics are not accurate My shooting form Any more Ideas?[/QUOTE] You are on the right track in analyzing your problem. Could be any or combination of any of the above mentioned. Can you verify your velocity by borrowing another chronograph. My chronograph is consistently reading 30-35 fps too slow but is within the manufacturers plus or minus acceptable reading. Can you borrow a range finder to verify your velocity. I always check the adjustments on any scope - you would be surprised at the results. Assuming ammo comes from same lots of powder and primers as shot across chronograph - what do you get for readings of avg. velocity, extreme spread and standard deviation. How many rounds are you shooting to determine that you are .5 to 2 MOA high. Also - when you get .5 to 2 MOA high is this out of a cold clean barrel versus 2-3-4th shot or slighly fouled barrel?? Does your area get much barometric pressure differences - although at 4-5 hundred yards this shouldn't cause a great difference. How much difference does your rifle show between a cold or clean barrel versus having fired with a slightly fouled barrel. I have one rifle that after you clean it you better send about 4 rounds out the window before you do any analyzing or you could drive yourself nuts. Good news is that it seems like you are getting consistent results from actual to theoretical. Aside from all the above - the most consistent problem I have found from programs to actual is the bullet manufacturers published BC's. If your velocities are correct etc. try playing with the BC input to match your actual shooting data and see what you come up with. Do not assume that published BC's from bullet manufacturers are nuts on. A couple manufacturers are pretty good and some are very under on what they are published. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
calculations 2moa off, need advice
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