I suggest using 100 grain bullets for deer as long as they are lead bullets (not solid copper). If you reload, one of the best bullets for deer in .243 is the Barnes TSX. That solid copper bullet MAKES the .243 as it allows you to shoot the faster 90g or 95g bullets and yet penetrate better than the lead 100g. Unless you are expecting all shots to be under 100 yards, I recommend you zero your .243 for 250 yards. That way, a .243 bullet going 3000 fps will be 2.65 high at 100 yds, 2.21 high at 200 yds, 3.7 low at 300. Just aim for the center of the shoulder at any distance out to 300 yards and you have yourself a deer.

use the 100 grain and it'll give you more of an exit wound and better stopping power

i site mine in with 243 winchester silver tip 100 grian at 1.5 inches high from center at 50 yards and then send a few down range at 100 yards and 200 yards to fine tune

I agree with 100 grain for a 243. I site in at 100 yards, but most of my shots are well under 200 yards. If you're taking longer shot's, Dakota Man's advice to zero at 250 sounds good.

100yds. Family likes the Vital Shot's best for deer here in Ark. at those ranges.

95 grain

100gr. The heavier weight will carry the energy farther. The longer length will be more stable in flight.