I have been using IMR4198 in my .223 to launch 52 gr HPBT at a moderate 3,150 fps for 35 years in a single-shot and the barrel is still fine. But, if your .223 is a semi your results may vary.
.243 WIN - I only owned one for a few years and I used IMR4831. Didn't shoot it enough to make a judgement on barrel life.
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