Thread: 257R Experiences

Im wondering if many people use the 257Roberts?

I got a new Kimber Hunter a couple of years ago but haven't done a lot with it, but recently have used it quite a bit and am impressed.

Initially I had trouble with it loading at full mag length. But Jaco did a nice job of modifying the magazine and sorted that. Then it took a while for me to click that it was very temperamental to barrel heat and that 3 shot groups were the max with compulsory cooling in between.

Then it started misfiring. Jaco to the rescue again - I was setting the shoulder too far back on the cases.

I wanted 110 ELDX to work but couldn't get them to group. But have struck a good load for the 115grn NBT at 2,930fps using R26. So it's finally sorted. Groups around .75moa. 117 SST work with the same load too. Im using Hornady 257R cases and resized various 6mm Rem and 7x57 cases. All are ok.

It's mild to shoot (although seems to be loud - with the DPT on). It's tipped over everything Ive shot from 50 yds out to 340 yards and every one has been a pass through. The 115 NBT are vicious.

So all in all Im quite happy. Using the 115grn I think of it as a .243 on steroids or a .260 shooting 120 grn.

50 yards


230 yards. I aimed a few " low for the very steep shot but actually hit where I aimed


115 yds


80 yd Impact