In bolt guns you can play with OAL when loading 1 at a time, but in AR's stick with listed OAL for AR's do to proper feeding form magazine,always FL sizing will illiminate feeding & chambering problems. I would seat to the knurling on the bullet to hold bullet in place during recoil. Both powders are good for the 223 & 308, primers- both are good. Shot tracers in VN, don't know mush about reloading them, but I don't think it's good on your barrel. Hope I helped in some way, Ba Safe Chris
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