Best chamber for handloading 223 or 556?

It has been 10 years or so since I bought a DMPS but their 2 stage trigger has come a looong way. It breaks crystal right at 3lb 5 oz with no creep at all.
I really didn't see that coming. I actually expected to buy a Geissele trigger right away. Im not saying that its as good as a Geissele but it is no comparison to what I had on my original LR308.
 
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