From the Trijicon website re: the TA01NSN -

The reticle bullet drop compensator and range finding stadia lines are based on the trajectory of the 62 grain bullet from a 16 inch barrel, flattop mount.

Should I be concerned about differences in the drop compensator lines if using 77 grain ammo out of a 14.5" barrel?

I'm assuming that at 100 to 200 yards the difference will be negligible, but I wanted to consult the resident experts.

According to many posts over the years on here and according to reps at Trijicon, No bullet weight has very little to no affect. I was told there may be a difference of about the width of your stadia lines. At the ranges your talking about I dont think youll see any difference at all.
I use a TAO1NSN on a 20" Flat top Armlaite and Im within 1MOA out to 500m using 55, 62, 68. I havent shot 77s but I dont think its much different, maybe a little more drop.
cp

Look at the top of this forum. You've got a whole list!