Originally Posted by Northrunner
I've got both .223 and 5.56 brass. Can I use an RCBS .223 FL Die Set and load the 5.56 as though it was .223? What I mean is all the brass, both sizes mixed together, run it all at the same time at the same settings?
It'll all be shot through a new 580 series Mini-14.
5.56 brass will probably be a few thousandths longer (unless trimmed) and slightly lower capacity.
If you are not crimping length will not matter but if you are it will. If using Lee FCD length will not be critical.
Different volume equals different pressure so take that into account and stay a bit down from max charge till you see how things work out.
I know the Mini is not a super accurate rifle but prefer to use same headstamp brass for a given load which I have worked up and catagorized for accuracy, POI etc. YMMV Following that practice I have been achieving 3/8 to 1/2 inch, 50 yard 3 shot groups with my month old Mini Tactical. I am too old to be walking to a 100 yard target very often so am doing my workups at 50. I will stretch it out later.
I started using Accurate 2230 with excellent results accuracy wise but had a lot of un burned particles which actualy caused some cases to stick.
I tested some more (Hotter) 2230 loads today along with some Varget loads.
2230 still caused cycle problems but Varget did not. There was a clearly defined difference in chamber residue between the two.
I am going shopping for more Varget and at least 1 pound of H335 to try.