magnetospeed users...

[letrbuck]

Folks that are using a MagnetoSpeed during load development...

I know on lighter contour barrels they will cause a POI shift, do they change barrel harmonics enough to make a big difference in group size?

I guess another question would be have any of you gotten a good group with a MagnetoSpeed attached and then that load didn't group once it was removed? Or vice-versa?

 

[KineKilla]

My poi and group size did not change on my 7mm. I imagine it could though.

I like to do my load development using group size and consistency as the sole goal. Once I know the rifle likes that load, I use the chrono to gather the speed, es and sd data for scope calibration.



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[Tahoe1305]

I personally shoot about same size groups with it on as off on 3-4 different cartridges/guns.

That said almost always the POI does shift down a tad. Thinner barrels more than thicker.

I’d say worst is 4” at 100yds.

 

[flyfisher117]

Depends on the barrel. My little pencil barrel. 243 has a POI shift of like an inch and the groups only open slightly if at all. My heavy barrel. 223 has a POI shift of nearly 6" and groups open tremendously. My heavy barrel other gun has almost no shift of either. I can list every barrel and there is no rhyme or reason.

 

[Wyohunth]

Small Poi shift for me, but I’ve not shot enough Rounds with one on to say if groups open up.

 

[Seeknelk]

My proof barrel 300 shoots 4" high with it on. Similar group size tho.

 

[mj23polaris]

On my Sporter barrels decent poi shift like 2-3 in. My comp gun is a heavy varmint savage profile like .1 mil shift in poi. AR platform stuff is little less then Sporter barrels for poi shift

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[JGRaider]

IME, the Magnetospeed is very accurate and reliable, but I get POI shift every time. I find the most accurate load first, then attach the MS for velocity sake.

 

[SportsmanCDA]

Agreed above- my magnetospeed picked up shots super well but the POI & grouping shift on-off drove me crazy as a variable.

Switched to a Labradar and while it’s nice having the barrel free, Im not sure if the app disconnecting and occasional missed shots is much better..

 

[Bomberodevil]

I don’t use the Magneto-speed during accuracy shooting in load development. I shoot my groups, then after I have selected my most accurate load, then shoot at least a group of five for my velocity data. I don’t think the weight of the chrono hanging off the tip of the barrel would move the POI a lot, but during accuracy testing, I don’t want to take that chance.

 

[TxLite]

My group sizes remain consistent but poi shifts anywhere from .5-2” depending on which rifle it’s on. I do load development with it mounted then remove it to confirm/adjust zero, then take it to distance to confirm velocities/bc.