Well finally got around to working up a load for my 7x57.
Factory Hornady 139gr SST were OK and did this....,
N150 under a Speer 145gr SP did this....
This was 100m off a bipod, glasses on under a midge hood whilst being attacked by billions of the wee Devils. Take the bullet diameter off and that's a 0.4" group.
Just shows you that beginners can develop a decent load. I'm not saying it's easy, but it's not black magic either.
And more to the point, there is very little that all these new fangled cartridges can teach my old girl.
PS took my first deer with this loading last night