Berger 109 LR Hybrid and Lapua Scenar 105’s

[BD1]

Are you measuring the variation on seating depth with the Forstner die on the Lapua 105s at tase head to tip, (COAL), or at the case head to datum line?  My experience with the case had to tip of the bullet was =/- .005, but IMHO that is not the dimension that determines accuracy. I care a lot more about case head to datum line, (where the ogive contacts the lands). Thats the issue I had with the Forstner Ultra micrometer seating die.

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So today when I reply to a post I see a button to "add attachment". Maybe I can post pics now. Something to do with paying to join?

I am measuring ogive length. I gave up on overall length 20 years ago.

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I also found a couple more Grendel mags in my stash and ordered some more online. I don’t like having mag issues affecting my accuracy.

I've been using two 10 round Duramags and they seem to work without any issue, so I just ordered some 20 rounders. However the 40 rounds I've fired so far, loaded five at a time, is not a significant sample.  The 10 round Duramaga allow seating to 2.30 which is another big plus IMO.  I'll report on the 20 rounders when I get a chance to load some more.