I have two 6mm BRs, one has a Kreiger and the other has a Hart barrel. There is about 150 FPS diff. between the two.

They shoot almost the same load, but I will amit that the faster one does have .2 tenths more powder.

Some barrels are faster than others and that is facts, even from the same maker.

I have several makes of custom barrels and can not tell you one is better than the other. I do like some makers better than others but can't tell you why.

I may not be smart but I can lift heavy objects

I have a shotgun so I have no need for a 30-06.....