The following is a response from a member of SavageShooters in regarding loading the 300gr Berger for a Savage 110BA in 338 Lapua. Note this rifle has a 9:1 twist.
Donald,
For starters, the magazine was well thought out, it has plenty of room. By my measurements, I get the internal magazine dimension at 3.775". If I were to load the Berger 300's so they touch the lands, the OAL (meplat) would be ~3.727". This is approximate due to the variation present in any bullet's length measurement from base to meplat (between .002" and .007" or more, depending on the manufacturer and bullet type). This would allow me to load to the lands and still have close to .050" extra room in the magazine.
As it happens, I chose to jump the Bergers .030". This gives me close to .080" clearance in the mag.
Of course, I never measure OAL (meplat). OAL (ogive) is a much more repeatable number and will give you vastly more consistent seating depths. For my comparator tool (with a .338 insert), I get that OAL (ogive) to the lands would be 2.824". With my .030" jump (taking advantage of the "hybrid" nose profile), my seated OAL (ogive) is 2.794"
As aforementioned, my load workup is just beginning, I tried 90 grains of Retumbo, and just loaded up some 91 grain loads to see how they perform.
Darrell