Looking for Help - Barrel Harmonics Question
- Thread starter Paul Milone
- Start date
Yes. 2.5"
Not a weird wind thing in my opinion. The results were replicated on 2 diff scopes on 2 diff days. Same lot of Hornady ammo
I'm running a 26" barrel. My shooting partner runs same length (and has a brake) and gets just slightly slower than my 2797
If your muzzle velocity and the 100yd zero is correct it can only be GC. It takes a GC around 1.3 to get that drop at 500 yds. Unless you are shooting wadcutters that's not possible.
If your GC and 100 yd zero is correct the MV would need to be around 2350. That would be a really bad box of ammo.
If the GC and muzzle velocity are correct then the 100 yard zero has to be almost 5" low.
Something is really way off.
If your GC and 100 yd zero is correct the MV would need to be around 2350. That would be a really bad box of ammo.
If the GC and muzzle velocity are correct then the 100 yard zero has to be almost 5" low.
Something is really way off.
You must have a long neck Paul!
Ned Ludd
Silver $$ Contributor
My first thought was whether you set your ballistic program to correct your elevations based on your 100 yd zero. The numbers change quite a bit if the program doesn't "know" that.
However, JBM gives required elevation numbers with your reported velocity and generic set of atmospheric inputs that are very similar to the 2.6 mil value you reported (JBM predicts 2.5 mil to go from 100 to 500 yd). The fact that it's actually taking you 4.1 mil to go from your 100 yd zero to 500 yd, whether you twirl your elevation turret OR use a calibrated reticle, suggests that the external ballistics are what they are. Your program and inputs seem to be correct as different calculators give similar values.
That leaves only a few possibilities, including the launch angle theory or much lower velocity than what you recorded. I could be wrong, but I strongly doubt a change in barrel launch angle would account for 1.5 mil, or 5.16 MOA difference in POI at 500 yd, which is a vertical difference of ~27.0" on the target. By the same reasoning, your velocity would need to be about 2300 fps, rather that 2800 fps, to account for that increase. Your chrono would have to be pretty far off to account for that. Likewise, your scope reticle and elevation turret would both be need to be off by a large and equal amount to account for that.
It is an interesting question, I agree. But at this point all I can come up with is A) you were using the "old" Hornady bullets and the tips all melted and fell out right as the bullets left the muzzle or B) the atmosphere in your neck of the woods is approximately as thick as honey. I'm guessing you would have noticed B), so I'm going with the tip melting theory until you provide us with the real answer
.
However, JBM gives required elevation numbers with your reported velocity and generic set of atmospheric inputs that are very similar to the 2.6 mil value you reported (JBM predicts 2.5 mil to go from 100 to 500 yd). The fact that it's actually taking you 4.1 mil to go from your 100 yd zero to 500 yd, whether you twirl your elevation turret OR use a calibrated reticle, suggests that the external ballistics are what they are. Your program and inputs seem to be correct as different calculators give similar values.
That leaves only a few possibilities, including the launch angle theory or much lower velocity than what you recorded. I could be wrong, but I strongly doubt a change in barrel launch angle would account for 1.5 mil, or 5.16 MOA difference in POI at 500 yd, which is a vertical difference of ~27.0" on the target. By the same reasoning, your velocity would need to be about 2300 fps, rather that 2800 fps, to account for that increase. Your chrono would have to be pretty far off to account for that. Likewise, your scope reticle and elevation turret would both be need to be off by a large and equal amount to account for that.
It is an interesting question, I agree. But at this point all I can come up with is A) you were using the "old" Hornady bullets and the tips all melted and fell out right as the bullets left the muzzle or B) the atmosphere in your neck of the woods is approximately as thick as honey. I'm guessing you would have noticed B), so I'm going with the tip melting theory until you provide us with the real answer
.
B Nettesheim
Gold $$ Contributor
My advice is follow Brian Litz's entire procedure and you will have no more problems!!!!
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