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Rifles, Reloading, Optics, Equipment
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<blockquote data-quote="LongRange338" data-source="post: 2893794" data-attributes="member: 5611"><p>OK, a few thoughts to consider.</p><p>I've entered your data and get the same outputs as you were getting. (Assuming 100 yard zero). There is no sense adjusting BC at that short of distance as you really won't see any discernible difference in your calculation without massively adjusting it. That only leaves us with a few items to check off the list for the error you are seeing.</p><p></p><p>-muzzle velocity</p><p>-zero distance</p><p>-scope tracking/reliability</p><p>-shooting groups (at distance you are trying to find the center of the group to adjust off of, you can't adjust from a single round)</p><p></p><p>Off the cuff I would wager your scope is not tracking perfectly 1MOA per 1MOA adjustment. This isn't the end of the world but needs to be verified and accounted for if you want correct calculations. Many calculators have a field that adjusts for this.</p><p></p><p>Your zero distance would have to be off substantially for the error but it is possible if you are only using a range finder. Break out a measuring tape or use a gps to confirm distances. if you are within 2-3 yards I wouldn't imagine this to be the issue.</p><p></p><p>You mention using a couple of different chronographs, but were the measurements taken the same day that it was 89 degrees or previously?</p><p></p><p>It is tedious to track down the culprit but your data isn't going to line up until you are able to track down the error. Again, my suspicion is in the scope itself as even the best are known to have an issue occasionally.</p><p></p><p>ETA: Also I see that your bullet isn't in the 4DOF side of Hornady's calculator. I've not had great luck with their BC calculator but at 400 yards it still shouldn't be that far off</p></blockquote><p></p>
[QUOTE="LongRange338, post: 2893794, member: 5611"] OK, a few thoughts to consider. I've entered your data and get the same outputs as you were getting. (Assuming 100 yard zero). There is no sense adjusting BC at that short of distance as you really won't see any discernible difference in your calculation without massively adjusting it. That only leaves us with a few items to check off the list for the error you are seeing. -muzzle velocity -zero distance -scope tracking/reliability -shooting groups (at distance you are trying to find the center of the group to adjust off of, you can't adjust from a single round) Off the cuff I would wager your scope is not tracking perfectly 1MOA per 1MOA adjustment. This isn't the end of the world but needs to be verified and accounted for if you want correct calculations. Many calculators have a field that adjusts for this. Your zero distance would have to be off substantially for the error but it is possible if you are only using a range finder. Break out a measuring tape or use a gps to confirm distances. if you are within 2-3 yards I wouldn't imagine this to be the issue. You mention using a couple of different chronographs, but were the measurements taken the same day that it was 89 degrees or previously? It is tedious to track down the culprit but your data isn't going to line up until you are able to track down the error. Again, my suspicion is in the scope itself as even the best are known to have an issue occasionally. ETA: Also I see that your bullet isn't in the 4DOF side of Hornady's calculator. I've not had great luck with their BC calculator but at 400 yards it still shouldn't be that far off [/QUOTE]
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