OAL question

[MphsTiger1981]

I have some 100 grain round nose FMJ bullets that I bought for my .380 reloads and I want to load some up for my 9mm. I found a safe starting load listed for the powder, but i'm not finding any information about a minimum OAL. Lyman shows 1.005 for 95 grain FMJ and 1.090 for 115 grain JHP in the 9mm, but no listing for 100 grain RN or FMJ. The average OAL for the first few rounds I've rolled are 1.04.

I know the rounds will fit in the chamber, I've dropped them in and they fit fine. My concern is how do you know if they are too short, possibly causing too much pressure?

[Jonnin]

pressure is not OAL. Pressure is where the butt of the slug sits relative to the case depth (the internal depth, not external). If you seated a 380 deep enough to be a problem in a 9mm, it would look like a wadcutter round for a revolver. You actually need to seat them moderately shallow to get them to feed and behave well.

[MphsTiger1981]

Thanks, Jonnin. I realize now that I did not word my question properly, but you answered it nonetheless. Thank you.