Hello all. I own and use the Magneto Speed extensively during load development. Firstly, yes your magneto will work with the lever you mentioned. I used it when I was developing loads for my Henry 101 chambered in 45/70. The same procedures for any other rifle is used with the set up of your lever. Ensure you use the aluminum square tube spacer rod and adjust the distance from the bore using the spacers provided with the kit. No special technique required.
Id like to give some other info regarding the Magneto Speed devise. This devise, if used properly, is very accurate. I have seen several threads regarding this devise and there are a fair number of negative reviews regarding it. These negative reviews are a little surprising, considering that most of these negative reviews are given by persons who don't actually own one. I have an Oehler 35P (in my opinion the best chrony I have purchased). The Oehler is inherently accurate, but if not set up properly, it would be borderline useless. I think that can be said for any measuring devise, could it not?
The Megneto speed can not be used in the exact same application as a conventional chrony. The Magneto will effect point of impact, depending on the rifle. I have played around with this on no less than 15 of my rifles. Some are effected slightly and others drastically. The only commonality of the testing was that all of my rifles had the accuracy effected to some degree. One statement can cover these results "WHO CARES!". During load development I firstly want to find the most accurate load I can manage. I don't care what speed it is travelling. Once I am satisfied with the load (and that is a rare occasion), I then go about ascertaining the speed of that load. Only loads that show strong promise of accuracy get put to the Magneto speed. After all, when have a you heard of a shooter brag about how fast his projectile went past his target? If the truth be told, I question the value of knowing the exact velocity of a load and how it is invaluable data when utilized at average hunting range scenario's (100-250yds)?
For me, I am heavily invested in long range TARGET shooting. My primary battery consists of the 6.5-284, 7.62x51, 300 WM, 338 lapua and the 408 Cheytac. To achieve maximum range I need to find the most accurate and fastest load (in that order). The magneto speed is great for this. In comparison to my Oehler, set up is easier, it is more convenient and less disruptive when used at public ranges. After using the Magnetospeed for 2 years, I find it every bit as accurate in measuring velocity as my Oehler.
My next step to long range load development will be sure to solicit negative (and anonymous) internet comments. The next step is to pack up the Magnetospeed and break out my Lab Radar. I will leave the Lab Radar out for now, as I probably have derailed this thread enough already.
Good luck Dirk72 in load development of that lever. If nothing else, it will be fun playing around.
Regards,Cory