Okay Facts on the table.

I have here today inquestioned my gun regarding this "lancater rifling".

Here are the numbers: The oval part goes approx 60mm or 2,36" down the barrel. The narrow side measures 18,35mm or .722" the wide side measures 18,66mm or .734".
The gunsmith says it is very clear that there is a spiral or a twist. The rest of the barrel is cylindrical.

I`LL mail him a paradoxbullet here later this week, so we can see how it will "fill the barrel" .

Have this type of Lancaster muzzled ever been recorded before?..Are we re-dicover something new we can add to the gunwisdom?

More to follow: