I’m also seeing that 1200 seems to only be loaded with light bullets.What I see with my books and software is its good with light bullets up to 55 GR in 223 and my data stops with that. I would bet its right in the burn charts with Reloader 7, I've been loading a ****'ton of 223 the last few weeks with 55gn and 21 gn's of Reloader 7. I bought a few 5lb'ers from Brian a few years back just for this load.
Edit. Its a wee bit slower than Reloader 7, if you search you might find some data on heavier bullets.
Please post what you find.
Got the opportunity this week to do some load development with a 223 bolt gun and this Alliant 1200-R. Only problem is that data for this powder is very scarce for some reason.
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Want to know if INGO has any experience / data with 1200 R in .223. Thanks.