Originally Posted by
swheeler
Like I say, I think it has to do with the powder itself, ie harder to ignite ball powders v easier to ignite ball or extruded. Now I never said all ball powders or all extruded powders, heck there are ball powders with NO deterrent coating. I don't have any way to test pressure and don't think it would give the complete answer anyway? I'm pretty sure we all agree the added velocity is from increased pressure, but is positioning the powder responsible for the entire increase, I don't know that or think that. Some brave sole could run this kind of test with a powder that shows no position sensitivity(Unique, Bullseye, 231) in the case being tested, then add dacron and see what happens:shock:but that is usually a NONO with these powders.
Ever wonder why a no-no if positioning powder is dacron's only purpose? If that were true pressure would stay the same or close enough to make NO difference.