thanks for all this guys, that's really helpful. It looks to me that most likely I'm pretty close to what I can expect in this barrel already with 2206H. If we take 200 fps off 3650 in a 26" barrel, we get 3450 which is pretty much what I've got now at 3426. I'm working from the ADI and Nick Harvey manuals for this - and yes I noticed that H380 doesn't have an ADI equivalent. It's interesting to me that the popular 22-250 powders seem to cover quite a range of burn rates also. Anyway thanks again.
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