Armed Polite Society
Main Forums => The Roundtable => Topic started by: Fly320s on February 17, 2013, 09:11:57 AM
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Anyone use one of these magneto chronographs?
http://www.magnetospeed.com/
If it works as well as a chrono with screens, I think I'd like it better. Seems to have less stuff to haul around.
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Ooh. That is cool. Also interested in reports.
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Long guns and revolvers only?
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Long guns and revolvers only?
Probably, unless you use lots of duct tape. =D
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Long guns and revolvers only?
And probably not snubbys at that.
Without the duct tape, that is.
As far I can see it's not a better mousetrap, just a different one.
And what fun is there in chronoing if you can't see someone shooting the screen(s)? (Because we never do that.)
stay safe.
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A Picatinny rail clamp would open up it's use to many semi-autos.
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I got one a few months ago, haven't tried it yet. But might have time next weekend to try it.
It is pretty slick for mounting, and even fits on my HUGE 110BA muzzle brake.
Ill try it with my AR next chance I get.
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Nobody is worried about the accuracy being impacted by strapping that thing onto the end of the barrel? It would be useful for a 1-time measurement of velocity, but I wouldn't be comfortable doing groups or testing handloads with that thing strapped to the barrel.
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^^^^^^
That.
Not only am I chronographing for speed, but also accuracy. I am afraid, with that thing, I would have to do 2x as many loads, the first set for speed, and then a set for accuracy.
I normally load up 5 rounds of different loads, shoot for speed and rough accuracy, then when I get a load that looks good on both speed and accuracy, I will then do a few loads on either side of the one that looks good purely for accuracy.
bob
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^^^^^^
That.
Not only am I chronographing for speed, but also accuracy. I am afraid, with that thing, I would have to do 2x as many loads, the first set for speed, and then a set for accuracy.
I normally load up 5 rounds of different loads, shoot for speed and rough accuracy, then when I get a load that looks good on both speed and accuracy, I will then do a few loads on either side of the one that looks good purely for accuracy.
bob
Ill do a test as soon as I can with factory ammo and my two chronos
Group test w/ and w/o magneto speed, and compare results of the two chrono (magneto vs my chrony beta)
I use the OCW method for load development, load up a set of 3-each of 7 over the span, look for minimum vertical variation over two spacings, expand that range to 9 loads of 3 each, look for vertical spread minimum, pick that one plus one on each side, then load a matrix of 9 with 3 different seating depths around my previous optimum (eg 0.010, 0.020, 0.030 jump), then look for the trend.
Requires approx 80 rounds.
Then I play with neck tension and other stuff to refine.
OWS gets the most stable load, and then the next steps refine for barrel harmonics.
If the 2nd step gives crappy results for vertical spread for barrel harmonics (ie if I get more than 0.5 MOA vertical across the entire range) then ill look at the next best span from the OWS, as there are usually two nodes.