Finally got the 26 inch 1:8 twist 25-06 back from the smith. I got out to break it in and test some reloads today. I used the new Enduron imr 8133 with powder magnum primers. The bullets are 121 hammer hunters unless cutting edge is listed the cutting edge are the 115 grain cutting edge MTH. I am using a lower end Caldwell precision chronograph in less than ideal situations, so keep that in mind. The following is copied from my notes: 57.5: 2969 no serious pressure signs. Second round error. Second rd error 58.0: error. Slight cratering. 2974. Slightly cratered primer. 58.3: 3023; slightly cratered primer, easy bolt lift. 3013; easy bolt slightly cratered primer no ejector flow. 58.7: 3068; easy bolt lift, cratered primer, no ejector flow. 3062; easy bolt lift, cratered primer, possible faint ejector mark Cutting edge 58.5: 2989; easy bolt lift, very little pressure sign 59.0: 3214? WTH?; easy bolt lift same primer cratering no visible port flow. 3122; easy bolt, cratered primer, no ejector flow Cutting Edge 59.0: 3067, no pressure signs. 3031 no signs. 60.0: 3151; easy bolt lift, slightly cratered primer. 3156. No real pressure signs. I shot a handful of rounds at 200 yards with no real zero. Luckily rounds were close already. Cutting edge and hammers were both within a couple inches of one another, as were the factory ballistic tips used for break in. I shot 2 rounds of 59.3 grain hammer hunters on paper at 200 and they were within 1/4 inch. Interestingly the imr 8133 was extremely effective at eliminating copper as claimed. The usual disclaimers apply.