I would not. Although I don't have any personal experience with it in .223, I would not think RL-7 would be very ideal in .223 - I think it's just too fast and there are several proven choinces. I would think RL-7 would be more ideal with lighter pills (like 50gr) and shorter barrels... think AR-15 cartridges. Of course, I assumed you were aksing about a Savage rifle (that is what this forum caters too, so I think that is reasonable even if you did not specify what you were reloading for).
Anyway... you have the powder and want touse it. So why not try anyway?
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