I have used the hornady plinker in the tube mag without a problem. It has a 'pointy' nose, but is lead, NOT FMJ. It is also a light Unique load that has almost NO recoil, so isn't a problem setting off the primer. I don't have a croney, but POI is about the same as 150 gr cor-lok, @100. I TAPER crimp, just to remove the bell. I looked at those carbine slugs, considering using them. Let us know how they work in the 30-30.