Dive recovery where you want to minimize alt lost vs corner velocity where you want to maximize turn rate. 2 different things...
I give up... 
You don't understand the context: HighTech claimed he
did pull 6 Gs well below 300 mph in a
real P-51D. When I asked him if it was pulling out of dive or horizontally, he never got back to me...
Since the SETP claimed in 1989 that the minimum
is 320 mph for 6 Gs at METO horizontally, I'll go with what the Society of Experimental and Test Pilots says... ("
Corner Speed is very close to maximum level speed on all four types (F6F, FG-1, P-47D, P-51D, within 10 mph), indicating a rapid loss of speed while turning at high Gs"
In your game the P-51 pulls 6 Gs all the way down to 240-250 mph, based on USAF data charts provided for the P-51. How come, when tested in 1989, the P-51 will not match this data?
Widewing came in and said the testers went easy on old airplanes... Why is 6 Gs any easier on an airframe at 320 MPH than 250 mph I wonder?
Also, it is possible, within my theory, to achieve 6 Gs at 250 mph on the P-51 with reduced power output (well below METO): USAF data may assume (like you all do) that prop power output has no effect on turning ability, and put this in the data as an "airframe limit". I consider the SETP data of 320 mph for 6 Gs at 10k feet as the final word for METO.
Widewing was reduced to questioning the SETP 1989 methodology, while giving more credence to WWII methodology...: Once again, I'll go with modern test pilots over video game "experts"...
Gaston