True round nose .40 S&W bullets are a rarity, so load data is hard to find. Most all of them are TCFP, not RN.
However, the correct OAL with RN for your gun would be:
Seat long, and keep making them shorter until the bullet stops hitting the rifling leade before they will fully chamber.
In otherwords, take the barrel out and use it as a guage to set the OAL for your gun.
rc