I have the Sporter and use it on skinny barrels to Sendero contour and have never had a missed to record shot. You may need to contact Magnetospeed and discuss your issue. Good luck.I have the Sporter model and I only get it to work about 1/3 of the time. It is always a placement issue. But many times it is hard to solve. Modern shooting has a lot of barrel devices, muzzle breaks, flash hiders ect... I can always get it to work with a clean barrel but when is the last time any of us has shot a clean barrel?
My recent attempt was with a Palma contour barrel and a 419 break. No go. We just could not get the correct alignment.
The OP solution separates the alignment from the barrel but would make barrel placement over the sensor very critical. You would have to be very careful to not shoot the sensor. I am going to build my own shim kit. Sometimes you need to straddle a muzzle device and the barrel. So you might need less thickness in front of the mount and more in the back. So having some one inch square rubber shims would be nice.
OP’s homemade solution is very cool.
If you have or can add a picatinny rail to your stock, Wiser Precision makes a carbon fiber mounting rod for the MS, with a QD pic mount. This keeps the MS off the barrel and you can shoot for both groups and velocity at the same time.
It has made it so convenient to collect data that I have velocity data on every one of the last 1200 rounds I have shot from a bench across 5 rifles.
@AZShooter 's bench-mounted solution looks like it would be perfect for those without pic rails or not wanting to modify their existing stocks. Looking forward to hearing how the tests go!Would any of these accessories work on a mannlicher stocked rifle? I know, I know, someone always has to be difficult.