Magneto or Labradar?

[Fat Albert]

I have both. Started w/Past 1 . Then to a Chrony, then to a Magneto that I would shot over both to get average between the two. Sold the Chroney for $25 and bought the Labrado. Use both to get average fps but only the Lab for groups. The Mag on the barrel did affect groups. When I bought the Mag and put on the barrel I could see that the weak point is the part that tightens the belt on the barrel. Over tighten and it will come apart. I tightened it on my 6TCU rifle and it would work it way forward with evert shot. When I put it on now I uses a loop of 1" Velcro through the front sling swivel and around the Mag. and it stopped the forward movement. My Labrado will see 6mm bullets out to 90yrds. I uses the Norma online ballistic program to find the short range BC of bullets by working the program backwards. Never found any bullet that had a adj. BC that was as high as the factory said it was. In 1965 I shot over a old school chrono that used two Mylar strip 2" wide and 18" long with a zigzag of copper printed on it that were held by electrical clips. The clips used electrical wires that went to a box that had about 100 lights on it. The strips were about 1 1/2 feet apart and you had to break both zigzag with one shot to get a reading. If you got a reading, different combinations of lights would come on and then you looked into a book that told the FPS for that combination. PS: If you uses the Norma program you have to list the BC with 0. then the BC.