Another question: I tried to find out the ideal bullet seating OAL for my specific rifle and following instruct in Speer book - First, barely seated a round, chambered it in rifle after marking bullet up with a sharpie magic marker to see if it was touching the rifling in the barrel, and I can't tell at all. Possibly it isn't touching the rifling (?) as I had to press it in a bit more from barely seated to fit the magazine. I chambered it slowly feeling for contact with anything and it went easily as if no contact bullet to chamber.
Do you guys have this factored in for your rifles or do you just use the OAL from the book? Better ways to find the rifling or even get this measurement from a book somewhere or factory?
Speer describes it as "Often, best accuracy is obtained when the bullet almost touches the rifling in the chamber throat" then spends two pages describing how to find this, a guy in a store in Anch also went into this as a fairly big deal. Now I can't see the rifling marked on the bullet, am at max magazine length at 2.936", adjusting the seating die in one full turn got me to 2.904 and progressively six more full turns down to get to the "book listed" Oal of 2.70 for the Speer Spitz BTSP bullet I was seating.
Seems like a lot of depth away from the max possible?
I checked the length of Factory rounds and the longest I have is a Federal 130gr Vital Shock 2.827 OAL
What do you think?