I have just finished setting up my 6.5-284 - the rifle will shoot .5MOA, it's a trued 700 Ti action with a 25" Krieger barrel, in the original factory stock, glass bedded, but I am about to change the stock. TPS one piece base, American Rifleman rings, Leupold Mark 4 with M5 turrets and TMR ret. I really like the setup and there is nothing amiss with the equipment.
I had just been shooting steel with it, until last week when I went on a Spanish Ibex hunt with a friend. Before I left home I zeroed the rifle. We drove to Tortosa, Spain and checked zero in the rifles on the first morning.
It was shooting a full MIL to the left. So I corrected zero and went to hunt.
The following day I got my shot at 340 yards and hit a full MIL to the left. Luckily that put the bullet into the billies' neck and killed him instantly. It was a very windy, gusty day, but where we were there was no apparent movement at the time, and even if there had been wind through the middle part of the path where there was no vegetation, it would have needed to have been something like 30 miles per hour to shift POI by a MIL, considering it could only have effected half of the bullets' flight path.
So today I took the rifle out to see what would happen. there was no wind whatsoever today.
Well, the first shot was exactly half a MIL to the right. I screwed on my new Vektor Maskin muzzle brake
and gave it 5 minutes to cool off to cold bore temps. It was only 3 deg C, and I was curious to see if the brake would change POI. The next shot with the brake on hit the exact same spot as the cold bore shot, .5 MIL to the right. A third shot, without moving anything hit dead center. So I moved on to my 3" gong at 310 and hit it, then the 4" at 450 and all the way out to 660 yards.
After shooting 25 rounds I decided to call it a day. Tomorrow I will try to get out again and see if there is a change in cold bore zero.
Can anyone tell me if there is something I am overlooking that is causing cold bore to be all over the place? The rifle can shoot accurately, shooting MOA out to 800 yards. But it seems to throw the first round out with no rhyme or reason.