I've received the best velocity and accuracy in all 3 of my 243s with 80 grners using IMR 4350, my son also got the best accuracy in his Mod 7 using 4350 with 80 grners. Using the TTSX in 80 grns you can really increase velocity in the 243 over the 100 grnrs and not give up penetration or bullet performance. For some reason the 80 gn bullets seem to get velocity out of proportion with other bullet weights and I have used this weight for years and 1000s upon 1000s of rounds. Have tried all the new powders as they come out but have yet to improve on IMR 4350 and always end up going back to it.
