Joe,
You always get so confused. I never said that button rifling was not accurate. It is the most accurate method for jacketed. I said that button rifling is not the best for lead because you can't pull a taller button through without heavier equipment or softer steel. And that the button puts chatter marks across the lands and grooves which is also detrimental for lead. When I talk barrels here it is related to lead use.
Joe. All barrel steel in this country is made by exactly 4 manufacturers. Krieger will charge you an extra $50 for a blank if you want 416 stainless because it IS HARDER to machine without screw ups. The higher the number the tougher to machine and hold the tollerances. Plus it takes more time. And the higher the failure rate too. Did they tell you that?
I will see if I have a Savage stainless around the shop. I will send it to you and you play with it and a nail. You won't need a lathe to see what happens.
Shot out has many definitions? Try no rifling at bore diameter just ahead of the throat. Once that occurs, it is shot out in my book. But you would have noticed it way earlier for lead.
JoeB has shot competitively for a day or two. If he says that he watched his throat lengthen, I figure that his throat lengthened. He shoots nothing but commercial lino and mono, so I doubt that he has a contamination problem. But bear in mind that was just a 223. I know my 06 Remington stainless has lengthened about .200. And that's only around 1500 rounds.
All lead that contains antimony is abrassive.
Ah Joe? You said Shilean was heasitant to say anything? Did they claim that THEY used 416 too?