- Location
- Somewhere on the Hudson Bay Coast
After watching the MagPul long range shooting video, I decided I'd order Accuracy First's Whiz Wheel ballistic solver. When you order it you provide some basic parameters for 3 loads, 3 wheels come as a set. So you provide bullet make, style, BC (G-1 or G-7), muzzle velocity, and the units you want to use for range and for the calculation and the rate of twist in your barrel. My primary wheel was for the .308/210 Matrix VLD, G-7 .326, 2650 fps, range in yards calculated in mils and a 1:8 twist.
The wheel has 5 windows. The bottom right calculates barometric pressure, or a value from a Kestral could be used. The lower right of center window calculates short range drops to a quarter mile, center left calculates intermediate range, from a quarter mile to 940 yards, and the two top windows calculate long range drops out to you maximum transonic range which in my case is 1590 yards. The mid range and long range windows provide calculations for nominal velocity, and for 50 fps over and under the nominal value. On the rear of the card there is calculations for wind drift based on a 10 mph wind, with full, half and quarter wind values, spin drift. If the values you put in results in a miss, provided you can mil the distance from your target to the bullet strike, the wheel can be trued to match the actual results, either by tweaking e BC by changing the barometric pressure, or by tweaking the velocity input to match what you're getting on target.
My wife and I went out a few nights ago and I sighted on a 12" steel plate at a half mile. Using the calculation from the wheel, I put 7.0 mils on the S&B, checked the parallax, centered the level, and touched the trigger. Boom . . . Clang! "Well that's boring, I guess we can go home now." I think its good value for the money, doesn't require batteries, and the only thing is doesn't do that the Horus A-Trag does is to calculate below transonic velocities that might be experienced at extreme range.
The Accuracy First Whiz Wheel arrived in my mail box USPS for $90.
The wheel has 5 windows. The bottom right calculates barometric pressure, or a value from a Kestral could be used. The lower right of center window calculates short range drops to a quarter mile, center left calculates intermediate range, from a quarter mile to 940 yards, and the two top windows calculate long range drops out to you maximum transonic range which in my case is 1590 yards. The mid range and long range windows provide calculations for nominal velocity, and for 50 fps over and under the nominal value. On the rear of the card there is calculations for wind drift based on a 10 mph wind, with full, half and quarter wind values, spin drift. If the values you put in results in a miss, provided you can mil the distance from your target to the bullet strike, the wheel can be trued to match the actual results, either by tweaking e BC by changing the barometric pressure, or by tweaking the velocity input to match what you're getting on target.
My wife and I went out a few nights ago and I sighted on a 12" steel plate at a half mile. Using the calculation from the wheel, I put 7.0 mils on the S&B, checked the parallax, centered the level, and touched the trigger. Boom . . . Clang! "Well that's boring, I guess we can go home now." I think its good value for the money, doesn't require batteries, and the only thing is doesn't do that the Horus A-Trag does is to calculate below transonic velocities that might be experienced at extreme range.
The Accuracy First Whiz Wheel arrived in my mail box USPS for $90.
