Might be the ogive like the Bergers that delay expansion some. The Lapua brass is harder than most maybe they use a similar harder alloy for the jackets.
Pat just made a new convert of me. I will give the 139 - 6.5 a try for next year in my Swede. The 130 Bergers are deadly but a little too explosive for my use at shorter ranges.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
| 
