Bullet seating depth and powder pressure

[texarkanahunter]

I'm developing new loads for my new F/TR gun. It's a 308 Win, Bartlein 30" 1 in 10 twist heavy varmint contour, throat depth .085. I'm loading the Berger 185 grn match hybrid in Lapua brass, CCI BR2 primers. I'll be trying Varget, VHT N540 and VHT N550 powders initially. Based on my understanding of the powder burn cycle here is a multi-part question. If pressure spikes at the moment the bullet starts to move and then quickly begins to drop, wouldn't pressure spike slightly a second time if the bullet is seated a fair distance off the lands since the bullet movement is impeded at this point? Also, how would this affect the resulting bullet flight and stabilization? Is the best precision load better served by seating at or extremely close to the lands?

 

[savagedasher]

Bullet seating defiantly has a difference on pressures out is normally less. In is definitely more.
Out it can move some before hitting the land. Way out its the same as adding more powder. I add 5000lb of pressure to max pressure when i get close or into the lands. Always start low and work up.All bullets take different seating depth.Rember guns and women are alike they both come in all different sizes and shapes. To keep them happy you have to find they like.
Larry