Chronograph set up for testing in prone position

[savageshooter86]

How are most testing or are you testing off the bench then going to prone after?

The intended use will be for Fclass shooting

LabRadar is taking forever so might have to go with Oehler 35 model

 

[3dogs]

MagnetoSpeed

 

[jcampbellsmith]

MagnetoSpeed

+1. http://forum.accurateshooter.com/index.php?topic=3864782.0 Regards JCS

 

[Erik Cortina]

Magnetospeed affects accuracy, so only good for obtaining speeds and no more.

I use an Oehler 35. Screens are mounted on a 1x6 that I just put on the ground and shoot over it.

 

[savageshooter86]

Thank you Erik. That hard to set up?

Could you send me a pic at some point showing me that set up?

Thanks

 

[amlevin]

Just use one of the shorty tripods that come with inexpensive spotting scopes. Too high? Dig it in a little.

 

[CharlieNC]

Just use one of the shorty tripods that come with inexpensive spotting scopes. Too high? Dig it in a little.

Ditto for me; no problem.

 

[jlow]

I have my Ohler 35P rail attached to a QD adapter so that I can snap it on to a regular tripod when shooting on a bench. I imagine (have not done this) that you can have a male part attached to a 1" thick piece of plywood that is long and wide enough so that when you snap the rail on it, it would basically sit almost on the ground and be stable. The only down side I can see is it would be difficult to level the board/rail combo if the ground was not flat, but I guess one can put leveling feet at each corner to fix this.

 

[fgregorio]

Question: if you use a magneto speed, you are attaching a weight to the muzzle of the rifle, therefore altering the mass and harmonics of the barrel, therefore altering the way that the rifle produces the muzzle velocity for a specific load?
I use optical chronographs for fear of doing the above.
Thoughts?

 

[Elwood]

This is only a 2ft bar and is purpose built for where I do my load development, it's completely flat ground but with a slight up hill gradient and it takes one or two minutes to set up. Getting it aligned is just so simple, obviously it's not that simple on a range firing point.

I plan on making one with a 4ft or 6ft bar and with height adjustment, but for the time being this serves my purpose.

As you can see it has lived a charmed life and I really want to say all the bullet strikes aren't mine, alas one of them is.

 

[jlow]

I think you actually have done real well. The problem is when the rifle is not attached to a rest of some sort, the actual height of the barrel can vary and this is I am sure you know what causes bullet strikes.

Even with a good rest and using a laser bore guide to adjust to the proper height, recoil can move the gun laterally causing reading errors and potential strikes to the supports. My solution to the lateral movement is to chalk in the points where the legs of the rest come into contact with the bench. Works but I am hoping to move to a LabRadar in the future.

 

[dickn52]

Probably said already. Shoot off the bench. Speed is speed and not directed by closeness to the ground.

 

[Elwood]

Probably said already. Shoot off the bench. Speed is speed and not directed by closeness to the ground.

My theory is that benches unless made out of concrete can move, where as the ground doesn't, or if it does you're not fully aware of the situation around you.

 

[Lapua40X]

Magnetospeed affects accuracy, so only good for obtaining speeds and no more.

I use an Oehler 35. Screens are mounted on a 1x6 that I just put on the ground and shoot over it.

Disagree. It will move the point of impact on target but the "accuracy" of the shots fired is not compromised. You just can't use the shot pattern for sight adjustments and rely on the point of impact to remain consistent when the bayo unit is removed. But it's not a sight adjustment instrument; it's a chronograph.

 

[Lapua40X]

Question: if you use a magneto speed, you are attaching a weight to the muzzle of the rifle, therefore altering the mass and harmonics of the barrel, therefore altering the way that the rifle produces the muzzle velocity for a specific load?
I use optical chronographs for fear of doing the above.
Thoughts?

Adding weight to the barrel should have no affect on muzzle velocity. If it did, heavy barrel rifles would produce muzzle velocities of greater or lesser values than light barrel rifles.

 

[Erik Cortina]

Magnetospeed affects accuracy, so only good for obtaining speeds and no more.

I use an Oehler 35. Screens are mounted on a 1x6 that I just put on the ground and shoot over it.

Disagree. It will move the point of impact on target but the "accuracy" of the shots fired is not compromised. You just can't use the shot pattern for sight adjustments and rely on the point of impact to remain consistent when the bayo unit is removed. But it's not a sight adjustment instrument; it's a chronograph.

How can it move point of impact but not affect accuracy? How can a tuner change accuracy but the magnetospeed can't when they are both a weight on the end of the barrel?

 

[lawrence97]

I've used the magnetospeed extensively on my 1.25" barrels and the only thing I notice is a vertical poi shift of 0.5-1moa. Groups seem to stay the same size. I do all my load work with it on and once I have what I like, I remove it and proof my load just to make sure nothing has changed.

If labradar could get their act together and a if few guinea pigs test it and post some positive reviews, it might become a a first choice over the magneto.

 

[snakepit]

I did a comparison at 600 yards with my 6mmBR/1.25" x 30" Brux barrel with and without my MagnetoSpeed installed. Overall the weather conditions were pretty good. I measured the target/group on my computer using the On Target Precision Calculator Target 2.1 Program. The 4 shot group without the MagnetoSpeed installed measured 1.346" width x .540" height. The 4 shot group with the MagnetoSpeed installed measured 1.390" width x .506" height. The group with the MagnetoSpeed installed was 4.281" down and 1.291" left center to center from the group without the MagnetoSpeed. Again, this was at 600 yards. To me the group size in this test with and without the MagnetoSpeed seemed consistent. I made no sighting corrections when I shot these groups.

 

[noload]

I like your group sizes and your test. Makes you wonder if tuners work, or do they tune the shooter?
Pat Lundy

 

[Erik Cortina]

I like your group sizes and your test. Makes you wonder if tuners work, or do they tune the shooter?
Pat Lundy

Tuners work and has been proven for a long time.