Tuning Tuning question on Mrod

[Aimright]

I recently tinkered with increasing the power on my unregulated 22 Mrod but before I went down that road I documented my original locations for the hammer spring, throw, and transfer port from their stops. A few days later I moved everything back to my original tune but my velocity was down by about 70 fps (717 vs the 785 that I wanted). I am fairly confident I did not miscount my original rotations from their stops, as at the time I was originally upping my power I did a quick check and went back to my original marks and they were right on the money at 785. After reading some more on tuning I see the gun should not be cocked when making HS and Ht adjustments. If I had it cocked while I was going back to my starting point, would that have caused this 70 fps discrepancy?

 

[Odoyle]

A 70fps discrepancy could result whether having it cocked or not. I wouldn't worry about it. It's a mechanical spring that cant perfectly go back all the time unless you got a power adjuster with detent and there's your TP screw could be a mm or 2 off as well further affecting the variance going back. Once set perfect things should be left alone if ultimate accuracy is desired.

 

[Aimright]

A 70fps discrepancy could result whether having it cocked or not. I wouldn't worry about it. It's a mechanical spring that cant perfectly go back all the time unless you got a power adjuster with detent and there's your TP screw could be a mm or 2 off as well further affecting the variance going back. Once set perfect things should be left alone if ultimate accuracy is desired.

Thanks Odoyle, I got it back to to the original fps, may still need to fine tune it a bit. I was surprised in the difference from my original settings.