Magnetospeed Sporter Question

[Brydawg512]

Hello all,

Went to the range today to measure MV on my new rifle using my Magnetospeed Sporter.

The builder of my rifle developed a load for the rifle, which was being shot today.

The builder's MV using my rifle averaged nearly 100 FPS higher than what I measured today. Additionally, ES and SD number were much higher when I measured today.

I'm wondering if there are any issues that could be affecting these readings with my chronograph?

I am considering renting a LabRadar chronograph to determine if the MV readings I received today were accurate or if they were fault of the Magnetospeed.

 

[can1010]

different brass, powder/primer lot, loading technique or even the magneto sport sliding on the barrel will affect the readings and consistency.
I have had the sport model slide quite a bet. I place the extra rubber spacer on the top of barrel under the strap and the tighten it down this has stopped the slippage that caused velocity variation.

 

[Rick Richard]

All chronographs will vary from one to another, which is why you TRUE your velocity at extended range.