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257 Wildcat on 308 Win case
I see a lot of questions on this forum as to why there are not more 308 Win based 257's out there and the consensus seems to be that it would offer basically 257Roberts type performance. It so happens that I have a F Class rifle built around a 308 Win necked down to 257, taper removed from the case and a 35 degree shoulder. I shoot the excellent 115gr Berger VLD's from a 32 inch Krieger and it is truly an excellent round. It consistently shoots 1/4MOA groups at 110yds (100m). I easlly get 3180fps with the 115VLD's and the 110gr Sierras (with which I have admittedly not done any load developments) does an average just shy of 3500fps. At this level there are absolutely no pressure signs. I have 1200 shots through the barrel and it still shoots like new. Even taking the longer barrel into account, the inherent efficiency of the 308Win case seems to come through and this one clearly punches above its weight. I have just last week finished building a hunting rig around the same calibre with a 28inch Border barrel - I will soon be in a position to report on what kind of performance I get from that set-up.
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