DT338LM
Active Member
I zero at 100 and then valdate my speed at 700. I always find the magneto speed to be slow by 40 -75 fps. What you guys get for results?
In the ballistic program i use there is a place to validate muzzle velocity. I don't use factory ammo. I reload everything i shoot. I use the magneto speed as a reloading tool and a drop chart tool. After i have my rifle zeroed at 100 i shoot at 700. From there i measure how many moa im off. When i input the new info in the ballistic program my new muzzle velocity always increases ..I don't understand how you validate at 700 yards ? the Magneto speed chronograph measure velocity at the muzzle. it doesn't matter what distance you shoot. If you shoot 700 yards and use the listed load velocities based on drop, the bullet BCs are not correct or the actual velocity at the muzzle doesn't match the listed velocity in the loading manual because of barrel quality or length.
Don't go buy the listed velocity check your velocity with another chronograph to see if your Magneto Speed is accurate and go with the velocity at the muzzle, not listed velocities. muzzle velocities are the most accurate because they eliminate any error caused by conditions that can/could effect the bullet.
I have tested my Magneto Speed against a lab quality chronograph and found mine to be spot on with muzzles velocity. If you place the screens for measurement 10 to 30 feet away from the muzzle you will get a lower muzzle velocity because of the distance.
On a three screen setup, there is a drop from the proof screen and the measurement screen. and that is only 2 to 4 feet in most cases.
Hope this helps
J E CUSTOM
Exactly....I think, we are talking about zeroing and using the MS at 100 or 200 yards. Then taking the MS off and shooting 700 yards and finding the dialed dope to be off. Then having adjust the velocity in the ballistics calculator to match the dope dialed.