My question regards spindrift. A shooting app will give you the MOA's/Mils for say 1000 yds but what about the horizontal component? Is this something you estimate, 10-12 in., or work out with your windage? At what range should you start accounting for this ? Thanks
Range Report Spindrift
- Thread starter Derek01
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Re: Spindrift
Most if not all ballistic programs have a setting to account for spin drift. But I, & many others have found that they all over compensate for it. So real world testing is required. For instance, my last brl needed about 3/4-1 moa @ 1000yd, but my new brl may need only 1/4 if that. The explanation is complicated so I'll not go into it here. Use the search (Google) on the right side, & you will find hours of reading.
Most if not all ballistic programs have a setting to account for spin drift. But I, & many others have found that they all over compensate for it. So real world testing is required. For instance, my last brl needed about 3/4-1 moa @ 1000yd, but my new brl may need only 1/4 if that. The explanation is complicated so I'll not go into it here. Use the search (Google) on the right side, & you will find hours of reading.
Re: Spindrift
Thanks for the help. Obviously I don't full understand the Shooter program. I added the twist and bullet length and turned on the spin drift but did not know the drift column was for spindrift. I thought it was for wind drift as I set 5 mph 9oclock wind as a standard. Let me ask this because my phone is broke and I can't play with the program today. Are there separate columns for spindrift and wind? Would these be added together as in 1moa for spindrift and 2 moa for wind for 3 moa total or 2 moa for wind which includes the spindrift 1 moa. I hope I'm making myself clear and I apologize if not. I just want to get it correct. Thanks again
Thanks for the help. Obviously I don't full understand the Shooter program. I added the twist and bullet length and turned on the spin drift but did not know the drift column was for spindrift. I thought it was for wind drift as I set 5 mph 9oclock wind as a standard. Let me ask this because my phone is broke and I can't play with the program today. Are there separate columns for spindrift and wind? Would these be added together as in 1moa for spindrift and 2 moa for wind for 3 moa total or 2 moa for wind which includes the spindrift 1 moa. I hope I'm making myself clear and I apologize if not. I just want to get it correct. Thanks again
Re: Spindrift
There is only one column and they are added together. Put the wind in at 0 or 180 degrees and/or set the wind speed to zero and you can see your spin drift contribution.
There is only one column and they are added together. Put the wind in at 0 or 180 degrees and/or set the wind speed to zero and you can see your spin drift contribution.
Re: Spindrift
Inside 1000 yards, spin drift is essentially negligible, compared to the natural dispersion from shot to shot--even after you have all the ballistics (wind elevation) completely accounted for. You will not be able to measure SD at 1000 yards with a gun that shoots 1 MoA at 1000 yards. That is SD is in the noise.
Outside 1500 yards, spin drift starts to show up outside the natural dispersion of the barrel.
Inside 1000 yards, spin drift is essentially negligible, compared to the natural dispersion from shot to shot--even after you have all the ballistics (wind elevation) completely accounted for. You will not be able to measure SD at 1000 yards with a gun that shoots 1 MoA at 1000 yards. That is SD is in the noise.
Outside 1500 yards, spin drift starts to show up outside the natural dispersion of the barrel.
Re: Spindrift
I've always found these threads interesting but I still can't see this being a factor for 1000 yards and under. Sitting there staring at a 1000 yard target, across numerous valleys, tree lines, streams and who knows what else between you and the target and having no idea how much wind, which direction it's coming from with the pre-mentioned terrains trying for a first round hit and folks are worrying about SD and the ever so slight adjustment that may be needed amuses me.
Yes, I agree it's a real factor but being realistic and trying to factor that in when there are 100's of other variables that take priority over that. Even the ones that say they put in 1/2 or 3/4moa to account for it how do they know there isn't a breath of breeze that did it other than SD? We take our best guess for that distant target based on what we figure the wind being and go for it and if it's a near miss we make the adjustment and get the hit next round.
I know some like to account for all variables and like everything to be perfect based on scientific calculations and formulas but in real life shooting it rarely is gonna be that perfect a world. Past 1000 yards it might be a factor but again Mother Nature is in control so knowing that small adjustment still isn't going to guarantee a hit.
Just my thoughts on it which means next to nothing but not worrying about it gives me one less thing to ponder about while ringing that distant steel.
Topstrap
I've always found these threads interesting but I still can't see this being a factor for 1000 yards and under. Sitting there staring at a 1000 yard target, across numerous valleys, tree lines, streams and who knows what else between you and the target and having no idea how much wind, which direction it's coming from with the pre-mentioned terrains trying for a first round hit and folks are worrying about SD and the ever so slight adjustment that may be needed amuses me.
Yes, I agree it's a real factor but being realistic and trying to factor that in when there are 100's of other variables that take priority over that. Even the ones that say they put in 1/2 or 3/4moa to account for it how do they know there isn't a breath of breeze that did it other than SD? We take our best guess for that distant target based on what we figure the wind being and go for it and if it's a near miss we make the adjustment and get the hit next round.
I know some like to account for all variables and like everything to be perfect based on scientific calculations and formulas but in real life shooting it rarely is gonna be that perfect a world. Past 1000 yards it might be a factor but again Mother Nature is in control so knowing that small adjustment still isn't going to guarantee a hit.
Just my thoughts on it which means next to nothing but not worrying about it gives me one less thing to ponder about while ringing that distant steel.
Topstrap
Re: Spindrift
Thanks for the help. Now I have a better understanding of spindrift and can actually see it and calculate it on my shooting app. Presently, I'm only shooting out to a 1000 so far but I plan to shoot farther as my skills improve. One step at a time. You guys have been a great help.
Thanks for the help. Now I have a better understanding of spindrift and can actually see it and calculate it on my shooting app. Presently, I'm only shooting out to a 1000 so far but I plan to shoot farther as my skills improve. One step at a time. You guys have been a great help.
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