The OAL of a cartridge is personal prefrence as long as you do not jam the bullet into the lands. I prefer .003 off myself, because it is an easy setting to work up. You find the "just touching point" using black magic marker and back off 1/8 of a turn with your seater plug. Some prefer .010 off and some like just touching. You might try all three and see which seems to work for you. Just understand that the closer the tolerance the least forgiving the load is for dirt and dust.
I looked up Benchmark for you on a data site that had 104 loads for the 243posted. There was but one load for Benchmark and only one bullet weight, a 70gr over 39.3 gr with no group size but the velocity was 3400+ fps. So sounds like you should find something for the 55 at 39-42 grains. Just work up by .5 grains.
Ah, just found it see if this does not help you:
http://www.reloadersnest.com/detail....rk&LoadID=6373
Best,
Ed
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