I've had excellent luck with accuracy and game killing performance with the interlocks (both sp and btsp). I will add that the 140gr. interlock seems like it would be a match made in heaven for the 270 win.. I run 165's and 180's in my 30 cals and 162gr. BTSP interlock in my 7mm rem mag. I've taken deer up close and past 600 yards with the same results: Dead deer....