I went out and re-tested my Blaser in 6.5CM after the first test showed shifted from the drop. The 270 with identical model NF NXS 2.5-10 did not shift. Since I had identical scopes and identical mounts I just didn't believe the mount would have moved on one and not the other. I concluded it must be bad mounting on the 6.5CM. Again as the 6.5CM barrel is new to me on this rifle I didn't have a lot of rounds on it yet.
I took the 6.5CM mount apart, cleaned all the rings again with acetone, applied rosin to the inside of the rings, but this time tightened to 25in lbs. where normally I do ~20. My 270 was already at about 25in lbs. so I must have done this already in the past and that scope did not shift.
TLDR: The scope did not shift.
I did three shot zero to verify it again. Then I did 3X 18" drop on right side and no shift. Then did 3X 36" drops on right and shot. No shift. Then 3X 36" on left side. No shift. I stopped at this point because I was happy that it was not shifting and didn't want to burn all my ammo. I then went out to 200 and 400 yards and shot on 8" plates without incident. I'll do 680y tomorrow but it's unlikely to be a problem.
The dots below are 1/2" shot at 100y. I had to hustle on the R and L targets as a rain storm was moving in along with wind, but they are all within what I'd call acceptable cone of fire for the Blaser in terms of what I expect from this rifle.
For those that are critical of dropping a rifle, let me say a few things.
1) I don't normally drop rifles, but I've taken spills with them and they've tipped over when on bipods, etc. I think it's a good idea to at least see what happens with an 18" drop onto a mat.
2) An 18" drop onto a ridge rest mat is nothing. Really. If your rifle can't do it without moving then something is seriously wrong. It's the equivalent of a rifle tipping over after leaning against a tree or other object. A totally plausible situation.
3) 36" on a foam mat again is not abuse. Again this is completely plausible if your rifle were to fall off the bed of your truck or attached to your backpack and you fall backwards, etc.
The biggest thing with the testing is that there are lot of variables involved. My mounting was the issue here but it took testing to work it out. But, I'm happy with the conclusion. If you are using Blaser mounts you may want to use higher torque of 25 in lbs.
*if your scope can handle it without damage*.
