Help with seating my new Lapua Brass properly

[Gargoyle]

I put in a bullet measuring 2.789 and it fed perfectly. If you see where I measured from there is still clearance for the bullet to slide down into the magazine. Measuring the maximum distance to clear a round into the magazine is 2.80.

When I am limited by magazine length, I load them lightly touching the front of the mag. Less they fly forward in the magazine upon recoil. I then adjust powder and powder charge for tune.

 

[JFrank]

Jim, his overall mag length is all that really matters in this scenario.
Some tangent bullet designs may give him the ability to touch lands, but I wouldn't hold my breath.
Seating deeper is the only option.
What I found interesting is taking a known load in Federal brass and wondering why it wasn't successful with Lapua.
Basically the OP changed his recipe when changing brass, I believe he needs to rework the powder charge

Yes, I didn’t really need the question mark at the end of the post. I already new the answer just like you do.

 

[mgunderson]

Base to ogive measurements should be generally similar for a well tuned 308 and target ogive bullets. Changing brass may move the tune for the seating depth, but it typically doesn't move more than a few thousandths.

 

[Bc'z]

Base to ogive measurements should be generally similar for a well tuned 308 and target ogive bullets. Changing brass may move the tune for the seating depth, but it typically doesn't move more than a few thousandths.

Brass volume changed his tune

 

[mgunderson]

A stable seating depth tune will typically hold up over obscene speed changes. Brass volume is not enough to change that. Might want to consider other factors.

 

[Sandstorm]

We dont really know how stable it was to begin with...but yea i get it too.
It should not change much...however adjustments in seating will help get it back followed by
final powder adjustment if needed.