Yeah the old SUPER 45 stuff was based around 3 pellet loads and a 155gr bullet for several companies. The claim was it was roughly equal to a 7mm-08 at the muzzle. Well you might get 2500fps but the results were more of a shotgun pattern than a group. The twist certainly isnt the problem because ive seen my Pacnor 1-22 shoot awesome groups with modern sabots at well over 2700fps.
Its a bit more challenging with BH209 but ive hit close to 2500fps without crazy high loads. They were over recommended max but completely safe in my Pacnor 45 416R barrel. 150gr by volume should break 2500fps with a 200gr sabot load. Really though you are better off going to one of the new heavier 40cals like the Fury 250 and stay closer to Westerns load data. 2100-2200fps should be possible with the 250 and close to current max recommended.
Lets see
.998 bullet length...i think that is correct for the 40-250
2150fps....should be no problem and plenty safe
1-22 twist
JBM says......Stability: 1.968 which is more than enough
Kwk says....1-26 is all that is needed.
What about the 225gr Accumax?
1.27" long
2200fps should be no problem
JMB says...Stability: 0.915 So that probably aint gunna happen unless the aluminum tip length is killing the numbers.
Kwk says you need at least a 1-21
Section density of a 250gr 40cal is sweet. .223 which is equal to a 50cal weighing 390gr or a 45 weighing about 318grs. Penetration should be excellent and the Fury is bonded. Sure you can gain more with sabotless $2+ a pop bullets and a sizing die but at $44/50 these have some stellar potential for a hunter.