Originally Posted by beltor
Ok, I have 5 rounds loaded with federal small pistol primer (100 I think), Hornady 180 gn FMJ-FP, 4.2 gn of HP-38. 3 have an OCL of 1.124 and two of them hav a 1.120 will the two with the shorter OCL be ok, or do I need to pull the bullet and reset them?
Yes, they will be fine. 4 thousands of an inch is less than the thickness of a human hair and will not affect pressures in any way.
Hornady lists this bullet at 1.125, you are right on the money with Hornady data. Bullets will vary and OAL will vary. .004 is nothing and as good as you will get.
That said, OAL is bullet and firearm specific, not manual specific. You need to check you loads and make sure they fit in YOUR chamber before you leave the bench.
Take the barrel out and do this. If it looks like #4 you need to seat deeper regardless of what the manual says. The finished rounds should drop right into the barrel and fall right back out when tipped upside down.