Marsh,
  This thing about BP causing more obduration than smokeless seems to be pretty well excepted. I'm going to say I'm not to sure. Looking at pressure curves of both powders they don't seem all that far apart where it counts..... At ignition.

  I don't ever recall seeing an experiment where bore sized bullets were shot into a sawdust box with both black and smokeless to see if both expand the bullet to groove size. We know black will, but will smokeless? Interesting thought!

  Getting on a roll here! 

  Personally I could never figure out why some people seem to think that a bore sized bullet is as accurate as a bullet slightly over groove size. A bore size bullet has to obdurate to fill the grooves and seal off the powder gases, and in so doing what guarantee is there that it will bump up evenly? In the old days there were reasons for using bore sized bullets, but from all the target shooting articles I've seen it appears as tho they used bullets of groove size.

  A bullet, for best accuracy, has to fit the bore properly and be hard enuf so that the shock of ignition doesn't completely pass thru the bullet and deform the nose. This would apply whether the powder was black or smokeless. So whether black or smokeless produces more obduration is kind of moot since a proper sized bullet will actually size down slightly, unless of course it's breech seated. But even then we only seat the bullet out so that it engraves to about halfway into the bottom band so some of it will be sized down.

  Your thoughts!?

PETE

40_Rod,
  In your message you started a new paragraph with the comment "However on the subject of Antimony" when you mentioned Antimony so I figured that you were delving into another area of cast bullet alloying.

  I will agree that alloys with Antimony in them MIGHT not be applicable for Schuezten. Haven't tried that but have shot a lot of mono and Lino bullets that were paper patched, as I mentioned in my reply to Marsh. Possibly this might protect the base of the bullets in such a manner that the edge of the base won't "chip", but I doubt it.

  I'll stand by my assessment of your "test" of Lino bullets.

  I also don't know of anyone having done experiments with Lino bullets in plain base bullets, but have shot Lino in gas checked bullets without the gas checks with some success. Possibly someone ought to try shooting Lino PB bullets. Never know what might happen. Wouldn't recommend it in an old original soft steel barrel, but there are plenty of Schuetzen barrels out there of modern steels that would handle it.

  Plus maybe cranking the MV's up too. Some of the problem with soft PB bullets is that you can't get the MV's up to where they might be able to handle conditions better. Don't know of any rule says we have to use tin/Lead alloys, and no rule limiting MV. Might be time to think outside the box!

PETE