6.8x43mm Surprise

Will it GURPS?

The 75gr bullet from the 22 ARC at 2953.4 fps will do 6d-1 pi.  20 avg.

The 108gr bullet from the 6mm ARC at 2626.7 fps will do 6d pi.  21 avg.

The 123gr bullet from the 6.5 Grendel at 2485.6 fps will do 6d pi.  21 avg.

The 120gr bullet from the 6.8 SPC at 2648.6 fps will do 6d+1 pi.  22 avg. <-- This is more than the normal 6d pi from a 16" barrel.

6" of wood is DR 6*

1.57" of concrete is DR 12*

The 1/2" mild steel plate backing the first two tests is DR 28.  None of them should penetrate the steel after the frangible materials.  All of them go through the wood.  All of them should exceed the HP of the concrete paver.

I'm ignoring the water test.

1/4" of mild steel is DR 14, they should all penetrate and they all do.

3/8" of mild steel is DR 21, 6.8 should penetrate and the others should not.  By ONE FREAKING POINT OF DAMAGE!!!  I guess this is what a single point of damage looks like.

I am not sure it really GURPS, but its a marginal case.  That 6.8 round went through with more than a point left over.  There's a ±10% fudge factor built into the rules that might help account for it.  Adding 10% to the 6d+1 brings us to 7d-1 and that averages 23 points of damage...  It still seems like it's carrying more through than 2 points.

It's not really a difference in bullet construction, they're all plastic tip rounds.  If anything the DR of everything should be doubled because they're all (0.5) pi+ rounds because expanding ammo!

I'd say it almost GURPS.