There was a post on rimfirecentral.com a while back that I followed . The gentleman gave a nice report on his ammo testing in a Winchester chambered in 17WSM with 20 and 25 grain ammo . He concluded that the ammo was the limiting factor in accuracy . I am pretty sure there were crono results included .
Of the 150 rounds that I fired thru my new B Mag these past few days I had several with low report that resulted in bad fliers spoiling decent groups .These were 2 different lot numbers .
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