Not sure which bore scope you are using but that single, persistent dark ring may be a shadow. See if you can look at it from a different angle by going through the muzzle. One of my rifles will look like this from one direction and then when viewed from a different perspective, it’s the step at...
I was just notified that Raven Rocks Precision has Norma 22-250 brass in stock
https://ravenrocksprecision.com/norma-22-250-remington-brass-50-ct/?utm_source=instocknotify&utm_medium=email&utm_campaign=instocknotify
6.5x55 Tikka T3x, 22” Rock Creek 1:8” twist, suppressed. Lapua brass, CCI 200, COAL 3.045”. 125HHT, Varget - 43 gr @2995, 43.5 gr. @ 3041, 44 gr. @ 3017. All 5 shot groups <.5”@100
My gunsmith threaded my 6.5 Tikka T3X Lite with 1/2-28 thread. I then installed a self timing Fat Bastard brake works really well. I also use the 1/2-28 CB flash hider when using my Thunderbeast suppressor. Flash hider and suppressor work so well that I did the same with my T3X Lite 22-250.
My Montana Rifle Company 280AI has been rebarreled with a 24” 1:8 twist. I have two good hunting loads with the 143 Hammer Hunter bullet and have taken 2 bull elk and several bucks.
My loads are:
Peterson brass, Federal GM215M primer, loaded with a COAL of 3.34” to fit in my magazine.
Powder...
I agree that the suppressor heats up very quickly, causing mirage when bench shooting. I use a rechargeable battery operated fan that I got on Amazon. I just turn it on and point it at the suppressor and it takes care of any mirage issues. This prevents me from having to shoot with the brake...
I’m not familiar with that suppressor but you mention the 6.5 end cap. Do you have a different, larger end cap to try so you can see if the end cap is causing the issue?
Welcome from Wisconsin. We are heading out to Maine for our annual vacation on Saturday. Will be staying about 20 miles west of Augusta. Where are you located?
Warrenoliver
I use the Etymotic electronic in ear device with the foam inserts that I get from Amazon. Very effective. when shooting at the bench, I do use my headphones also if a guy with a brake is next to me.
I’m also a hearing aid user with the Phonak hearing aids and want to protect what little hearing...