OK, I've always heard the rule of thumb that you should bullet should have at least one diameter seated in the neck. i.e. for a 223 Rem, there should be at least 0.224 of the bullet inside the neck. But I'm having some problems with that.
I was loading up a bunch of ammo for my AR and I was going to use 50gr Remington HP bullets (old bulk bullets I bought years ago from Midway). Those bullets are only 0.612" long. A 50gr HP in Nosler or Hornady are more like 0.716" and 0.725". 50gr Nosler Ballistic Tips are 0.789".
My problem comes in when trying to decide on what OAL to seat the bullets to. If I seat out to 2.260" (SAAMI max and what most reloading data is based on), then assuming the brass is trimmed to 1.760", I'll only have 0.112" of bullet in the neck. If I seat 0.224" in the neck, then my OAL is only 2.148".
Now, I really don't care what my OAL ends up being, I just want to make sure that: 1) I have safe pressures, and 2) The bullet won't fall out during recoil.
What do you guys think?