Very happy so far, “10 round” load development results.

[Sheldon N]

is after a few tests I have found there is no detectable difference in how the barrel shoots with and without the chrono hanging off it.

That can be true, however I have had barrels where the groups go to absolute crap with the chrono attached. Since a lot of what you are testing with OCW is all about barrel whip, I've felt better testing without.

 

[Sraw]

That can be true, however I have had barrels where the groups go to absolute crap with the chrono attached. Since a lot of what you are testing with OCW is all about barrel whip, I've felt better testing without.

I don’t know if I said it in this thread or not, I’m feeling too lazy to go back and look, but I generally try to find three or four loads for every rifle. One match accuracy load, one hunting load, and one cheap load for range fun or what not Sometimes I also try to find a varmint load.

The whole reason I started this new endeavor is that I’ve spent considerable amount of money in finding for loads for my rifles and I’m looking for a more efficient process.

With some of those loads costing $.80 a piece, those extra shots add up quick.

It’s all part of the game, A game I enjoy playing, but if I can streamline the process I’m all for it.

This isn’t a dedicated match, hunting, or varmint rifle. If it were and I only wanted one load, an extra 20 rounds for the load really wouldn’t matter.

 

[fredo]

I've noticed POI shift with Magneto on/off, but it seems that accuracy potential realized with it attached translates favorably to with it, off...

Just take your time between shots to make sure the Magneto is in the SAME position on the barrel, and the strap hasn't loosened/shifted during previous recoil. Barrel contour makes a difference here, as the more tapered tubes will wanna let the strap 'slide' loose...

You've gotten great info here, you're in the right track!!! All the best...

 

[Sraw]

Thank you all for your advice so far, I have used a lot of it and put it together for another load development method.

I started a new thread with that info titled “new load development combo method.” Check it out and let me know what you think.

 

[bgblue1978]

I have seen quite a few people mention not using the magneto speed for load testing because it affects barrel timing.

Is there anything wrong with using it for load development and just planning to use it all the time? As long as it's consistent why not just leave it on all the time?

 

[memilanuk]

Sooner or later you're going to have to take it off - whether for cleaning, fitting the weapon in the case/safe, etc.

Do you really think something tightened down by hand, with a strap, is going to be perfectly repeatable from one time to the next?

Even if the answer is "close enough", what happens when you bump into something?

 

[Ned Ludd]

In addition to Monte's observations, it is important to note that the MagnetoSpeed can change group size/shape by at least two different mechanisms. First, it acts like a tuner, simply because it's an "adjustable" weight hanging off the end of the barrel. As Monte noted, it's going to be very difficult to position it exactly the same every time and have it remain in that position. Second, muzzle blast from the sensor deck can cause the POI of groups/shots to be as much as 1.0-1.5 MOA higher on the target than with it off. The same mechanism will also cause shots to go right/left is the MagnetoSpeed is turned slightly in one direction or the other; again- very difficult to control and maintain with the attachment strap.

Having used a MagnetoSpeed for several years, my experience is that it can change group size/shape as well as POI on the target. Sometimes having it attached makes groups larger, sometimes smaller, sometimes not much of a change. The point being that you really can't predict in advance which effect you might see with various cartridges and loads. If there is a pattern to it, it's not been obvious to me. For that reason, I always load 5 extra rounds for velocity measurements, then remove the unit and shoot 5 rounds for grouping.

 

[Pigdog]

I have seen quite a few people mention not using the magneto speed for load testing because it affects barrel timing.

Is there anything wrong with using it for load development and just planning to use it all the time? As long as it's consistent why not just leave it on all the time?

I do this, for me it works I have not noticed a different in group size with my rifle only a poi shift up. I seat it up against my muzzle brake so that it is in the same spot every time. The points about how tight it is are valid I'm sure I just do my best to tighten it to the same amount every time hasn't been an issue for me. I like to have all the data from it.

 

[Sraw]

I have seen quite a few people mention not using the magneto speed for load testing because it affects barrel timing.

Is there anything wrong with using it for load development and just planning to use it all the time? As long as it's consistent why not just leave it on all the time?

You do you, I haven’t seen a change in group or poi like some people report. There is nothing wrong with always having it on if you want it I guess. Shoot with it and shoot without it. Record your data, the ABSOLUTE worst case scenario is you have more data and time behind the rifle.