Smooth bore. I actually never intend to make pattern welded billets. I found a pretty new HC spike last summer in a customers yard that the water dept. had left,almost ran over it with the mower (ya that would have meant buying a brand new set of blades). Picked it up and thought to myself well DARN!! now I have to make another forge and turn this into a knife. My plan is to screw up all kinds of trinkets and fire pokers and things like that (not self defeating just realistic) as gifts (some for people,some for the scrap bucket) to get my hammer strength and skill up to par before I try to turn the spike into a knife I can put on one of the bookshelves. Im no stranger to a hammer but I have never actually forged anything and Iv been alive long enough to understand that patience and practice makes perfect. Im not saying I will never attempt it but Its just not my intention. I do have a propane forge but I HAVE to have it to HT my knives. It is kind of delicate so I dont want to be banging around rebar,RR spikes,horseshoes etc in it. BTW Thanks for the advice about the soak I will definitely have to read into that and do my homework if I ever try it.