75gr ? 77gr (part 1 of 2) - 223 / 5.56 / 9mm reload central database
since the infamous 262 load is not generally on the market many have opted to roll their own versions with the 75gr bullet.
the GI version was more than a bit on the "warm" side. i do recall seeing a few flat primers from time to time.
the 75gr bullet is mostly OK in a 1-9" barrel generally speaking.
though longer is better i have used it with good results from a 1-9" DPMS 11.5" at the closer distances your likely to shoot such a short barrel. just don't expect to reach way out with it.
a general rule though is the shorter the barrel the quicker the twist rate for the 75-77gr.
from what i can gather a 14.5"-16" is generally about 110 fps slower than a 20"
my loads generate about 2750fps from a 20" --so my homerolled 262 is closer to the hornady steel match than the real 262 it is plenty strong enough and gives a little safety margin. it shows to have outstanding energy out to about 500m --about as far as i am ever gonna shoot a 223 anyways.
the heavy 75s and 77s have a reputation for being spotty in accuracy with the 1-9" barrels so far i haven't seen many problems though i did have a few flyers till i got the primers and powder charges leveled off.
my experience is nearly the same as the re-loader on the link.
the extra length and mass of the 75gr is helpful in the 223/5.56 as long as you don't give up too much speed or go overpressure.
the 75gr from a 20" is about my favorite all around shooter in the ar-15.