I have a MK5 270 WBY Mag and have had great success with it. My current load is Federal 210M primer, powder 67 gr. IMR 7828, 140 gr Nosler Accubond, OAL 3.420". I am looking for my target, but I want to say with ths load it was the best group I ever shot. If I recall, it was in the low .3's! I would like to get it chronographed and see where it falls. I ran the numbers on my JBM and out to 800 yards, about 13.25 moa, 2034 FPS, and 1286 fpe. This was with a 200 yard zero and a muzzle velocity of 3300 FPS. I would like to order a box of the Matrix 165's and see how they shoot! I have heard good things about them.
I was going to use it for a donor rifle for a custom build, however, it means a lot to me, so I decided to hold on to it. I sold the leupold which was on it, so I will be in the market for a new scope at some point. I was looking at the Talley Rings, they look pretty nice. I was also looking at the pierce engineering rings with built in moa. Maybe make it into a nice carry gun for bear!
Bored and rambling...............