I`d make a dummy to 1.275" which is the SAAMI max lenght and with the barrel out of my pistol (assuming a auto loader) drop it in the chamber and see if it goes all the way in. The bullet shouldn`t hit the rifleing and fully enter the chamber, if not seat deeper and try once again. When you have it seated to a depth that allows it to fall in the chamber stop, load a few to check feeding/function and if OK load to that lenght. Coloring the bullet ogive with "magic marker will help tell if the bullet contacts the rifleing.
This is assuming the manufacture doesn`t offer a suggested COL for that specific bullet. If you can find, or get one from the maker, use it.
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