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I just started to load for my .243 and I've had really good results from my first loads. First I don't crimp and I haven't had any need to. They suggest crimping if you are using your loads for hunting, keeps moisture out. Also if you are using an AR style rifle you need to crimp because recoil can seat the bullets deeper in the case.
As far as my .243 loads here is what I'm using:
Savage with a 1:9.25" twist 22"bbl
38.0 grains Hodgdon H4895 (hodgdon minimum load)
65 grain Hornady V-max
Federal cases.
C.O.L 2.600"
CCI primers
I'm using a Lee single stage press with there deluxe rifle dies. If you still have to buy dies for your .243 I would really look into these. It comes with a neck sizing die and a full length sizing die so you are covered either way. The neck sizing is the way to go in my opinion, way less stress on the cases and less trimming. Good luck and have fun.
My best group so far is .46" five shot group at 100 yards.
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