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Berger 105 hybrid won't seat

If you have to push that hard there's a problem...so 6br Lapua brass and 105 hybrids??

I'f you take the die apart does the seating step slide through the hole in the die body smoothly?? Wouldnt be the first time I had issues with Whidden seating dies and is the reason I only use Forster and Redding
 
You likely have to much powder in the case. If it's virgin brass and you use 30.4 grains Varget, like I did, you can't seat the bullet down far enough into the case with a .104 freebore. After the case has been fired once and sized it'll work. I reduced the load to 29.4 for the first firing, there's a node right there.