wimpish
they're wimpish because
T7 is slightly hotter, because of it's formulation, not much but a tad
Even though T7 may not be mentioned specifically in the manual.
It's BRASS Brass won't take the stouter loads, although this being
a physically smaller pistol, doubt you could load it hot enough to be
problem anyway.
It's a .36 cal The chambers are considerably smaller than a .44 so you
aren't going to get much in there anyway
And lastly, it's a legal issue. So many people over the years have gotten lawsuit happy.
So even though the guns likely can handle a larger load safely manufacturers
have been dropping the spec to what they know are safe.
But for accuracy you'll need to do what you did with your other guns.
Start low and work your way to max and find the best for that gun!