Well with those core lokts my dad uses those in his 270 remington, that he just got last year, i use federal in my 270 that i also got last year. we both use 150 grain both shoot the same out of each of or guns, Last year my dad shot a deer and it went right through her and hit another droping them both, that was luck that he hit the other one but shows those core lokts realy do the job , so far we havent had any disapointments with our 270's.They dont seem to ruin any meat realy and the shrapnel isnt a prob either. Any of yas ever see a 303 brittish that is my grandfathers gun that was handed down to my dad , he finaly put it to rest last year when he got his 270. That 303 realy did a great job and exspecialy long range he used remingtons out of that not sure exactly what. We aslo have an old 35 remington with the 32 remington that they dont make the bullets for any more, and a 32 special winchester , we use remington or federal and havent been let down yet with any of those guns or ammos. Happy hunten