The simple truth is that we, as reloaders, cannot buy the same powders the manufacturers use in their factory ammo. Another thing that is certain, if you try to identify a factory powder by sight, you are nearly 100% going to be flat out Wrong! This is especially true of pistol ammo, where most manufacturers use flash suppressed powders that are just not available to the public! Accurate said their powders are "reduced" flash but that is only in certain instances, it is not in all loads. AA9 has as much and the same brite white flash as H110/WW296 with max loads. Others that are as bad are Unique, Win 231, Blue Dot, IMR 2400 and in most cases IMR 4227. Now all that said, I have a load for my 44 Mag that uses the 200 gr Gold Dot (designed for the 44 Spcl) and enough 4227 to get the bullet up to around 1200 fps and it has no visible flash out of a 5.5" Redhawk, even at dusk. I have a similar load for the 357 using the 135 Gold Dots that is the just like the .44 Mag load (1200 fps), no flash. Unfortunately I have had no such luck trying to match Underwood's loading of the Lehigh Xtreme Defender bullets with any powder. Rats! I have tried nearly every powder with the exception of the VV powders which are pretty high priced around here. There is no data to suggest their velocities are any higher than what I can get my hands on now, so I carry factory ammo, have some reloads of the Lehigh bullets available and Gold Dots as back up back ups! Except in 10mm, since Speer decided to just crap all over reloaders everywhere and apparently are no longer making any 10mm bullets other than the 200 gr. Oh well, the XTP's will have to do! Thanks, Speer! (NOT!)
Cheers,
crkckr