The closed tips come in all different flavors and degrees of "closed". I had one .338 300gr OTM out of a box of 250 with the tip so solidly pinched shut with copper that neither of the two Kevin Cram tools opened up the tip. Next I took a small drill bit in a battery powered drill and tried to chase the countersunk tip open. Believe it or not, the drill bit exited the side of the bullet, rather than chase down into the empty cavity. NEXT, I took a grinder to the bullet tip until I ground away all the solid copper at the nose of the bullet, and finally reached the open cavity. By that time, the bullet was looking more like a wadcutter. I shot that bullet while breaking in a new Bartlein barrel.
My experience was with the SMKs, and none of them had solid tips so the Meplat trimmer worked
without removing to much of the jacket to harm it.
If the bullets have the hollow point tip closed all the way and near solid I would send them back for a refund and would not use them for anything but targets.
I suspect a quality control issue.
Just my opinion
J E CUSTOM