ERIK & ERIC

[jelenko]

Serious question here but why do you feel the OBT theory has any merit to it? I ask this because I trust my test results and while we did not in any way test for longitudinal barrel movement, the best support I can find for it is that most people claim it can get them "very close" to in tune. What I've found with tuners addressing vibration in an oscillating fasion is that there is only about .004-.005 of tuner travel(using my tuner) from completely in tune to all the way out. So, is that "very close" to in tune?

Serious question and I don't mean to start a shitstorm but I'd like to here the logic behind it when what I have stated from my vibration analysis testing is validated, upside down and sideways. I do think that longitudinal movement may well be one aspect but that the tuner being at the end of the bbl appears to adjust for it, seemingly small if any, value. Again, serious discussion only please.

Good question.

Just to the point about investigating phenomena. It might help to validate/refute his theory/effects.

 

[gunsandgunsmithing]

Good question.

Just to the point about investigating phenomena. It might help to validate/refute his theory/effects.

Fair enough. I can't argue with that except what I already posted seems to me to refute it. But I'm ok with just not agreeing...or maybe we do. IDK. Lol!

 

[ChristianSilver]

Thanks for all the replies, I pulled one shot on dot five. I knew the best tuner setting had to be in the 0 to 15 range. What surprised me was I didn’t get more movement in the groups, is that because my load was already tuned very tight?

This rifle shot and won at Missouri last weekend on a tough range, shot a 398 - 23 prior to installing tuner. I’m taking it out tomorrow and shooting @ 600 and see where the tuner is happiest at moving small increments.
Will update..

Thanks again..

 

[Bill Norris]

Doing the load work up to a happy place prior to beginning tuner adjusts is the only way to get the best tune. No free lunch.

 

[CharlieNC]

Good question.

Just to the point about investigating phenomena. It might help to validate/refute his theory/effects.

The frequency of the longitudinal movement (speed of sound) translates exactly into transverse, vertical vibration. You can measure this using the target and with an accelerometer.

 

[Ammolytics]

Would your approach be able to also capture compression waves as described by Chris Long?

Yes, assuming that the amount of movement could be magnified enough to be visualized. I'm attempting to do this.

There is an upper-bound for the levels of magnification based on the original video resolution. High-speed cameras trade-off resolution for speed, which is why they always appear to tightly cropped and/or low-res.

 

[ISS]

If you think of the barrel/load as a unit, the tuner is like tuning a harmonic balancer to find a node. Ever seen an oscilliscope (sp?) asnt he sine waves go up and down as the node moves?
If you don't accept my theory, have a mechanic take the harmonic balancer off of your car/truck and drive down the road. Make sure you notify AAA of your route.