DEPENDS, as they say, on what exactly you are talking about. If you shoot a lot of 223 and don't sort and include the various commercial brands and military you may be in for problems. A safe pressure load in Win or Rem brass may not be safe in Lapua or some of the military. You could very quickly find yourself in over pressure problems. Lapua for example is much heavier brass than most other commercial brands and this means that the internal capacity is reduced. Smaller chamber with standard loads means higher pressures. It is this actual chamber volumn that we are concerned with in reloading. By varying this chamber volumn we are also affecting velocity and as a result, likely the accuracy as well.

While this is not as important with most of our handgun shooting, the same principles still remain.

Consistency is the key to accurate handloads and it does not come from mixing brass.

For some of our shooting this is very important, and for some, it is not important. You get to decide what you want.

Ward