Quoted:
I have never had trouble with other vortex setups, including a different Krieger and a Noveske.
I took this particular Vortex in to my dealer and we measured the gaps between tynes; there was significant variance. Can't recall the numbers. Oddly tho, this particular Vortex worked fine on another barrel.
I will try a PWS556 today to see what effect that has.
For the difference with/without please see my other thread.
Look for bullet rub marks on that .260" bore area. Lets see if these longer bullets might be slightly unstable as they exit the muzzle and stabilize later downrange.
That would be an easy fix. ream to some larger dimension .273 7mm or .281 9/32
Whatever is happening most likely can be keyed directly to that little freebore .260ID by .160 OAL. Could even be gas and not even a rub, but the bullet flight is only able to be altered by this one feature. By the time significant gas has entered the flash hider the bullet is in air.
as a silencer manufacturer I have a lot of experience with bullets flying through bores. The .350 tine bore just isn't going to have any measured effect whatsoever. Certainly not
like you've posted here in your pictures.
Only other thing I could think of is something to do with harmonics of the barrel experiencing wave addition with the occilation of the tines. That's a little out there too, that's pretty unlikely.