You stated 100 yd group is tight? I do not know what that means?? Out of of of my 308's with cheap ball, 10 rounds makes about a 40 cal hole, the same gun @ 200 with ammo it likes will punch first 2 through the same hole, then due to operator error the third shot will be 1/4-1/2" to right. So what do you plan on shooting with it? If it's coyotes 12"+ group would not be acceptable for me. I did not really notice a group on the target you showed that is why I questioned if something was loose. In regards to the scope- I had put on Nikon M-300 and I also found that the first ( ring/cross hair ) 7X @ 150 yds was to thick for me to reliably hit a 5.5 X5.5" square! One would go in, one close, the next off 3-4 ", I had a standard mildot on this 300BLK SW previously and it put was close to 1.5 " @ 100 yd out of the box. I move up in size of my target and see where it goes. You may be having a similar problem that you have ( poor target definition ). I would suggest checking your rings, base etc, confirm @ 100 then move to 200 then to 300 and see if you can see the target, if group expands appropriately, and decide what level of accuracy is needed for your weapon. Be Safe,
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