Originally posted by NugginFutz
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LabRadar Chronograph Update
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My "6.5" = 24" AA Overwatch upper 1/9 twist, NC based US Tactical lower, standard A4 6 position stock, AR Gold Trigger, JPS SCS buffer, Vortex 6-24 x 50 FFP PST with EBR-2C MOA reticle
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Another advantage over conventional chrono's is that overhead light won't be a factor. One of the ranges that I shoot at has concrete tubes that you have to shoot through. They do it to keep the bullets in the range so folks don't shoot over the berms, but 20+ feet of five foot diameter concrete tube mandated the use of IR screens. The LabRadar shouldn't have any issue with this. Fortunately most of my shooting is now in NW WI where I don't need to shoot through tubes, and my Oelher 35P works like a champ, otherwise I'd be looking at the LabRadar very closely. It will be interesting to see reports back on battery life, range, and a host of other functions as these become available.
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I have read a lot of remarks related to POI change when using a Magnetospeed and saying that they cant shoot groups and get velocity data at the same time. Most of those remarks appear to come from the skeptics that don't even own a Magnetospeed. I use a Magnetospeed V3 for all of my load development and will say that yes you can still shoot groups and gather good velocity data without having to do it twice. On heavy profile barrels, I see no POI change. On medium contour barrels there is a little change but it is repeatable. The only exception to this that I have seen is with those that utilize a sporter or light weight barrel profile. As long as you hold your POA, your POI groupings will still be there. In the pic below the top groups are from my Grendel doing load development. The top six rounds are without the Magnetospeed. The bottom six rounds are with. Even though the POI dropped, very little, the grouping is still there. It is close enough to refine that node and tighten up the group if the velocity is within an acceptable range. This was one of the first things that was done after getting the V3 was to see how far off POI would be. The 338 group was testing POI change with a new TBAC 338BA suppressor. Three without and three with. On the 338, the Magnetospeed had zero POI change but the barrel is also .900" at the crown.
Not to stir up the debate but I see the POI argument not to hold a lot of value in this case. A magnetospeed can be attached, and your weapon can be re zeroed to match the POI change if desired. My concern is not with hitting the center of a target during load development. For that matter, if the POI change is three inches low, as long as the group stays there, then that is what I will work with. After a good node is defined, then re zero and your good to go.
Last edited by mwilkins; 05-26-2015, 09:25 PM.
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I have put a few hundred shots through my magnetospeed using an 18" barrel with a 0.998" O.D.
Group size seems independent of whether the bayonet is attached.
Group center can be an inch or two different at 100 yards.
Things change a bit if the bayonet is not firmly attached or if one allows it to drift forward during a session.
Direction the group center depends on whether the bayonet is directly below the muzzle or canted.shootersnotes.com
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