I cant figure why some guys have such a problem using small base dies. I use them for all my ammo thats going to go into a ar in both 223 and 308. My thoughts are that it hurts absolutely nothing. brass life isnt reduced, at least not to a point ive noticed and accuracy is just as good in my guns. My thoughts have allways been that i may have to rely on those guns to protect my family and if using small base dies and trimming after every firing is going to do even a small ammount toward insuring reliability a guy is about foolish not to sb size. thing is too that because ammo sized in a nomal die fits a specific gun sure doesnt mean it will fit another and ive got a number or ars and i want to know that any ammo i grab will work in any gun A 100 PERCENT OF THE TIME. 40 bucks for a small base set of dies is a pretty small price to pay for that piece of mind. One other advantage is that i pick up lots of once fired range brass cheap or free and a small base die will take that brass down to spec even if it was fired in a large chamber.