I've looked at a couple different pdfs online. I did the trig 2 times.
The 2 drawing I saw said.
2.602" to sear.. 2.973" to the hammer on the X axis
.210" down to sear... .016" up to hammer on the Y axis
thats .371 and .226 for a .4344 hypotenuse
What drawings do you have?
It isn't .210" down to the sear, it is .210 down to the thumb safety hole. Down to the sear pin hole is, .252" +.016", that makes the difference. So, .371" X .268" gives a hypotenuse of........... .457673", not .4344
CAW