Wow! Thanks for the info guys.

So the 577 NE 2 3/4 can be simply trimmed from the 3 inch flavor? That makes it rather easy.

Next question (now that my curiosity is peaked):

What is the difference in velocity between the two?

Is the COL of the longer cartridge? another 1/4 inch?

I haven't found loading data yet, but it appears that a 750 grain bullet is typical.

RobertD