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Old May 10, 2012, 09:27 AM   #2
wncchester
Senior Member
 
Join Date: December 1, 2002
Posts: 2,832
Jev, we can understand your question but OAL is much simplier than you have been led to believe.

First, no weapon cares where the bullet nose hangs in space, all that matters is the jump before the bullet hits the rifling. Seating long in rifles can jam the lands and that does increase start pressure without any real increase in speed so we need to avoid that. Seating short insures a bit of bullet free run before hitting the rifling and that reduces peak pressure and, usually, speed - but not much. It's rare for factory ammo to contact the lands in a factory chamber and that's not what most of us would want but it's likely safe to use.

Next, load book OAL is simply what the book team used to develop the listed data, it's not a 'rule' for the rest of us any more than their powder charges are. It matters not what someone else does, IF we're going to custom make our ammo to work best in our rigs we need to experiment with both charges and seating to find what works best for us.

Back when I started reloading very little loading data included even a suggestion for OAL, we just set it as we wanted according to our bullet, chamber and magazine and then developed our charge. We lived.
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