Can't you measure the groups on steel?
I suppose, I just hardly ever do. I shoot for hits, and rarely measure group size on the plates. The few times that I have were when the group sizes were exceptional. I fired a group at 560 yards with that same .25-06 using the 100gr MK that measured 1.1" for 3 shots. I thought that was awesome, so I measured it. For the most part, I'm shooting at 1MOA targets and a hit is all I'm concerned with.
BTW, I'm not suggesting that the .270 or .25-06 is the ideal long-range rifle- it's not. But it can be pressed into service adequately if you load the right bullet. There are a few bullets for both the .25-06 and .270 that work quite well.
