Does this OAL feed? If so, maybe stay with it. If not, shorter feeds faster and longer feeds slower. Nominal to me is 1.125".
After picking an OAL which feeds with a mid charge weight, then I would split the range into like 5 loads and try them for accuracy. I test 40 at 15 yds.
Sorry, but answering your question really isn't possible by my way of thinking...
FWIW, I like Titegroup, Longshot and AA#5 in 40. AA#5 is probably my favorite, but Longshot is faster.