X 30 Cal speed??

Also have cool long story about this 30 Cal barrel.it was Fredrick s .given to me by Alex at fx. Has been machined on brass part most unusual. Haven't seen anyone show this or talk about it.also probe and bass piece were drilled all the way through both top and bottom the machining takes the brass bown between the 2 orings a bunch this is almost like a miny plenium crazy I know but this work was done by Ernest . barrel was used by Fredrick 2 years ago at rmac.and Alex at ebr 2 years ago.it shoots great.iam set at 145 bar on reg.so trying to determine what advantage iam getting.