Re: wrong C.O.L
I would go ahead and shoot those loads. The OAL might be a bit shorter than usual, but I can't see any real problem. Try a few and see what happens.
You don't seem to be worried about the powder charge, and I agree. Newer reloading manuals are often very conservative. Older manuals (Speer #12) give a maximum load of 6.2 grains of WW 231 with a 230 grain FMJ bullet.