Speer even shows a 900 fps load for blue dot and a 230 GDHP.
Just curious where this suggestion is coming from? As others have pointed out, there are a lot of powders that will power the XTP from target to SD loads.
Me too, it wouldn't even be in my mind when thinking about what powder, but then for me there is no reason and nothing to be gained by trying to "hot rod" the .45 ACP even a little bit. My "full power" .45 ACP 230 Gr load using N-340 gives an average of right at 850 FPS +/- depending on the weather, is clean and accurate. It's not the holy grail or anything, but it's very good, just like a number of other combinations in .45 ACP.
I used to reference burn charts. IMHO, there's a lot of 'generalizing' and very little info otherwise.
"Burn rate" is a VERY inexact art, just one step away from voodoo. It is not a science. It's really only good for relative rankings, "rule of thumb" type guess work and SWAGs.
Blue Dot is way too slow for 45ACP. You'll be sadly disappointed. W231 (or anything on the chart show above) would be far, far better.
That all falls out when you do your load workup.
You mean... follow 'normal procedure'.
“Burn Rate” charts don’t tell you how much gas is produced by the powder under pressure or how rapidly the gas expands. They’re pretty much useless except to tell you which powders might be in the same general ka-boom range if you get careless with them.
The only burn rate chart that matters is the data set in your book.... the reason I say that is powder acts different in every cartridge. The load data in your book gives you burn rate in that specific case. I've gone way down this rabbit hole and that's really the best there is. You can compare other books with the same case and bullet weight to expand your options. But many manuals don't agree.
