My Rem 700 in 300 WM with 1-10" twist shoots Berger HT 215's and Hornady 212 ELDX just fine...but it shoots Hammer 181's and Barnes TSX even better ...on average...just saying..."just fine means groups are usually around 1/2", and invariably under 1", if I do my part..."better" ='s between .141" and usually well under 1/2", again if I do my part.with the 1:8 twist go with the long heavies with high BC's. Might even try the heavy new A-tip. Most 300 WMs are 1:10