Seems like some clarification is in order, lightweight rifles, and their associated ultralight barrels are by far my favourite pattern of a hunting rifle. Krieger, the world record holding barrel maker still last I checked, refuses to make very light contours as they feel it is impossible to make a very light contour barrel that will
consistently deliver MOA or better. I had to buy a straight cylinder from them and then turn it down here in Canada to get what I wanted, for instance.
I have some exceptionally fine shooting Kimbers, my Adirondack .308 for instance, which I would confidently take to an MOA challenge shoot-
for three rounds. It will still shoot very well by hunting rifle standards right up to five rounds, but the group is not going to be 3/4 MOA. For two rounds, I'm confident the rifle's capability is 1/2 MOA, however as the human driver I will not always deliver that. I also believe what Douglas and I believe another said here about shooting stress relieving barrels over time, engine blocks also experience the phenomena. None of my Kimbers are old enough to have experienced stress relief, will be interesting to see if any improvement is noted over time in hot barrel groups.
When discussing barrels walking as they warm up, my Kimbers typically put two rounds touching or close, a third that steps out slightly by 3/8 or 1/2" say but still well within accurate rifle specs, and fourth that opens that same amount again, and by five if you're shooting them one after another my Kimbers can tip over an 1", even kiss an 1 1/2" when hot to the touch, which doesn't take much shooting with a zero contour. Frankly I think that's fantastic performance. I'm talking long term averages not your single best group, any of the rifles will produce a sales forum cluster group given enough time between shots and one in three good fortune. And so what? I haven't had a bug hole Kimber since my SVT, and I love them just the same, but for that matter I own no other bug hole rifles either.
Out of the five Kimbers in the safe right now I've only shot four, the .338 Win (thank you Bartledan!) will only see a box of factory ammo for plain curiousity before getting a 30" .257 Weatherby barrel. I have high hopes for that rig once running, given Krieger barrels are supposedly stress free. Will be an interesting "control" against my other Kimbers too as I'm likely going to copy the Kimber barrel profile, as long as the 30" whip of a barrel doesn't screw it up slinging nigh on 4,000fps TTSXs.
The group at center of three is typical of my Kimbers, this is the Adirondack shot hastily off two stack rubbermaid containers from a computer chair, it's actually the very first group it shot, sighting in, it's an inch with the third stepped out from the initial tight pair. Still exceptional hunting rifle accuracy. The large group above was an off hand group for one of the forum "challenges", and I returned to fire a fifth shot at it hence the add on.
