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2nd timer wrote:
If you get a chance, you might want to run that load over a chronograph.
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I have. 87 of those rounds have gone over a chronograph in the 37 years since I first loaded them. That's where my quoted velocity figure comes from.
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Hornady 8th edition shows 19.1 gr as max, for 2900 fps
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Yes, and more powder would not be expected to LOWER velocity. But note that Hornady 4th edition shows 20.8 gr as max, for 3000 fps (out of a shorter barrel than was used in the 8th edition)
The load was developed when Hornady 4th edition was the then-latest manual. This was all disclosed in the note at the bottom of the post.
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I never had much luck with 4198 in the .223 for accuracy or velocity
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Well, I can't speak to your experience.
For my purposes, my accuracy/precision standard is whether, shooting offhand from a sitting or kneeling position, I can get 9 out of 10 shots in the 70mm divot in the side of a plastic milk jug at 100 yards and IMR-4198 (as well as IMR-3031 and WW-748) has been able to deliver that.