ORIGINAL: bigcountry
Is it worth it that someone on the internet says that you can use the data the same?
If you do like your supposed too and work up your load from 10% down, this is a moot point. And alot of drama added in. Look at your data in your manuals.
While the reloading data may in fact be similar for these powders (and it is possible that they are identical powders)....(BTW the new H4350 is a different color now) The time honored practice of starting with reduced loads is a practice meant to erase such differences as chamber variations,different bullet drags (often a 150 grain bullet is reloaded with the same data as any other 150 grain bullet of the same caliber) potential case variations, different miniscule bore diameters, and a variety of such things that make each rifle an individual.....two seemingly identical rifles will not always shoot the same bullets, loads, or groups at all! The practice of starting with reduced loads is definitely not for compensating for the substitution of powders.
Let me repeat this.....unless you know for a certainty that the powders are identical find the data for the one you are using and start low and work up.