[Adamantium]

Here is the best advice that can be given on OAL, it is from Accurates reloading manual,

SPECIAL NOTE ON CARTRIDGE OVERALL LENGTH “COL”
It is important to note that the SAAMI “COL” values are for the firearms and ammunition manufacturers industry and must be seen as a guideline only. The individual reloader is free to adjust this dimension to suit their particular firearm-component-weapon combination. This parameter is determined by various dimensions such as 1) magazine length (space), 2) freebore-lead dimensions of the barrel, 3) ogive or profile of the projectile and 4) position of cannelure or crimp groove.

So in reality the most important thing about OAL is that it functions in your weapon and you use it in your load work up. A smart reloader treats OAL like he/she would treat a primer or powder. If you are going to change it, work up a new load for it.

But if you are a new reloader and simply want a number to accept, I have used Berry's 200 grain flat points with an OAL of 1.18" and it works just fine all the way up to max load with Bullseye and Green Dot (in my gun of course).