AA Lapua 123 Scenar ammo won't feed but Hornandy will?

[sneaky one]

Jurassic-I talked with L-52 while doing the -meltdown procedure this winter-, I was about ready to hone it too far, extra heavy duty buffing compound-he saved me from myself on this same procedure-less is more/ My new AR upper is sooo smooth, almost like a gunsmith did the work- = sweet.