At one time I did have one of my 2 scorchers drilled with the 320 drilling, and I still have one of my tombstones drilled that way....since the group of tournaments I used to bowl with "extreme" patterns is no more didn't see the need to have my scorcher with that drilling so I put a much milder drilling back on it, since I was basically getting the same look from one of my tombstones. Either Tombstone I wouldn't part with, but.......my Amb Particle(16 pound) doesn't "have" to stay with me...the amb core is not the best fit for me.
Brad