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Rocky, he said this same error is happening on all of his and his friends' rifles. So, ask yourself what is common to multiple rifles? Your above suggestions has no commonality with all of his rifles because he is seeing it with multiple calibers (multiple BCs), multiple scopes, multiple cartridges, multiple scope rings, etc.
Wind isn't my issue. Elevation is. Range is pretty much sheltered from wind by trees. At the times we have shot with some wind, if I corrected for wind, the shots went the direction of correction. Then I realized the wind effect was minimized by the trees. Taking the wind correction out put the left/right windage impact back where it belonged. I don't recall shooting at any time with more than ~7 mph wind.If you don't have wind flags, here is an easy way to make something low budget. Flagging tape 2' long tied on top of markers. They can show you things that you didn't realize are happening.
Everbilt 48 in. Orange Ground Mount Reflective Rod 31474 - The Home Depot
Colorful and eye-catching, this orange 48 in. Reflective Rod is durable and easy to install in the ground thanks to its pencil point. It's high visibility reflective tape can be seen from a distance atwww.homedepot.com
Empire 1 in. x 600 ft. Orange Flagging Tape 77-062 - The Home Depot
Use the Empire 1 in. x 600 ft. Flagging Tape for surveying work and trail marking. The high-visibility orange tape is easy to spot and it remains pliant in cold weather. Can be used both for both indoorwww.homedepot.com
Yup these work pretty good.If you don't have wind flags, here is an easy way to make something low budget. Flagging tape 2' long tied on top of markers. They can show you things that you didn't realize are happening.
Everbilt 48 in. Orange Ground Mount Reflective Rod 31474 - The Home Depot
Colorful and eye-catching, this orange 48 in. Reflective Rod is durable and easy to install in the ground thanks to its pencil point. It's high visibility reflective tape can be seen from a distance atwww.homedepot.com
Empire 1 in. x 600 ft. Orange Flagging Tape 77-062 - The Home Depot
Use the Empire 1 in. x 600 ft. Flagging Tape for surveying work and trail marking. The high-visibility orange tape is easy to spot and it remains pliant in cold weather. Can be used both for both indoorwww.homedepot.com
Please keep the thread updated as at this point you have had every piece of advice under the sun... It appears to me that there must be a fairly substantial error being input to produce the results you are seeing. The really telling part of this is that it is happening across multiple rifles which would seem to lead to the same error input on all the rifles. And 400 yards isn't that far for the error to be noticeable.
I didn't take the time to read all the post! But if all the rifle were shot on the same day using the same info put in to them then it make perfect sense. But maybe I should have taken an hour and read all the comments before commenting. The environmental info is a huge issue and would make all the guns do the same thing.
With a right twist and the wind behind you the bullet will hit lower and if it is directly at you it will hit higher.
Psssst...Randy...it's the opposite.
Magnus effect
What scope are you using and have you verified that it's tracking correctly by doing a box test or tall.target test?Currently I use Shooter and Hornady 4DOF.
When both are fed the same inputs, they both put out the same data.
Recently, I've found a place to shoot ~400-420 yds or so. My guns are zero'd at 100 yds.
What I've noticed is that I am repeatedly impacting high on the target after dialing up. Typically 1/2 to 1 MOA difference in impact vs dialed. As an example, my Shooter app may say to dial up 5.5 MOA but actually 4.5 MOA gets the bullet close to point of aim.
So far, everything we've shot (myself, my brother and a friend) have all been high on impact. The closest one yet was my 30 Nosler #1, which impacted only 2" high at 406 yds.
This includes a 6mm ARC, 300 RUM, 30 Nosler, 300 WM, 28 Nosler.
My brother's 300 RUM was calling for 4.5 MOA up. Reality was it only needed 4 MOA up.
The 6mm ARC was calling for 5.5 MOA up, but only needed 5 MOA.
A 300 Win Mag called for 5.5 MOA up but only needed 4.5 MOA up.
I've looked closing at my data inputs, and scratching my head as to why. Everything seems correct. Conditions are input correctly, Gun specifics are correct, load fps is as accurate as my Chrony can be.
I even make sure my actual zero is input correctly as well, as both Shooter & H4DOF allow that.
I'm certain I'm doing something wrong, just not sure what.
If I do the velocity calibration for the 300 WM for example, it says I'm pushing a Berger 190 VLDH at 3273 fps which is insane. Chrony shows 3093 fps average for the load from a 26" barrel.
At 400 yds it's still off a bit, and at farther distances would only get worse.
Thanks, sometime dyslexic gets the best of me! What a great explanation.Psssst...Randy...it's the opposite.
This is quite easy to see when the bullet flies in a headwind or tailwind only (no crosswind). Suppose that you fire a bullet with a muzzle of 3000 fps and a tailwind of 10 mph. When the bullet leaves the muzzle its velocity is 3000 fps relative to the ground, since you are holding the rifle still relative to the ground. The wind at your back blows toward your target with a velocity of 14.67 fps (10 mph). Then, at the instant the bullet leaves the muzzle, its velocity RELATIVE TO THE MOVING AIR is 2985.33 fps. If there were no wind blowing, the bullet's velocity relative to the still air would be 3000 fps. Since the relative velocity is lower, the drag is a little lower when the bullet leaves the muzzle. As the bullet rides the tailwind, the drag is lower than it would be if the bullet flew in still air all along the trajectory. With less drag, the bullet reaches the target earlier (time of flight decreases), it has more remaining velocity when it gets there, and it suffers less drop (impacts a little high).
If you were firing into a 10 mph headwind instead, just the opposite situation would happen. The bullet velocity relative to the air would be 3014.67 fps at the muzzle. Since the relative velocity is higher than it would be in still air, drag is higher when the bullet leaves the muzzle. As the bullet bucks the headwind, the drag is higher than it would be in still air all along the trajectory. Consequently, the bullet reaches the target later (time of flight increases), it has a smaller remaining velocity when it gets there, and it drops more (impacts a little low).
