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magneto speed

4K views 10 replies 7 participants last post by  kmussack 
#1 ·
how much poi change for 308
 
#4 ·
Unless you plan on shooting in the field with the Magneto speed attached what difference does it make. Most people I know with Magneto speeds, that use them while working up a load, just shoot and evaluate the groups they get with the M/S attached and when done make the necessary adjustments in their zero with their sighter shots.

FWIW, the POI shift will be different on every barrel so as Rhyno430 said "Depends".
 
#6 ·
I'm going to offer an opinion based on my previous experience with speed measuring equipment. When measuring speed between two points there are two key parameters. First and foremost, the "trigger signals" have to be exactly the same every time. When a bullet, for example, passes each sensor they have to trigger off the SAME point. If one triggers off the point and the second (stop) triggers off a point farther back, you already have a built in error.

Second, distance between sensors has an effect. The magneto speed has closely spaced sensors. Compare that with the "Gold Standard" of the chronograph world, the Oehler 35 that has several feet between sensors as well as a third sensor to validate the first set of readings (Much like one would use two stop watches to get a closer time reading in a race (or even the old fashioned speed "clocking" from the air by State Troopers).

The closer the sensors the faster the computer clock speed.


Now for the real question, is the Magneto Speed "Accurate Enough". Sure seems to be but if you want to get the most accurate, consider one of those 8' long Oehler's.

Yes, the Magneto Speed wins for convenience but I've never found it to be a hassle setting up my Pact. I just use it after all load development is done then I'll shoot a practice session over it, at least 25 rounds or more, so I have a good handle on the speed, ES/SD.
 
#11 ·
Buy a copy of: Modern Advancements In Long Range Shooting, Volume I by Bryan Litz.
Then read chapter 15, Measuring Muzzle Velocity.
Spoiler Alert: The top two choices are the Magneto Speed and the Oehler 35P with 4' spacing.

I own and operate both and Bryan is correct.

Anyone involved in the long range shooting business really needs to read everything Bryan Litz has written.
 
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