Which barrel makers use a Sunen hone machine on their barrels?

[gunsandgunsmithing]

Every big block Chevy I ever raced had the block align honed. It has been a rather common practice since the early 1970’s.

But there is a lot of difference between the align hone used in the automotive field than that limber ittle thing used to hone barrels. First, the automotive align hone is massive and stiff. Its function is specifically to not only insure all the main saddles are the same size, but they are also in perfect alignment.
In short, it took the place of the old quick way align boring machines.

I have seen several videos of the honing of barrels. All were computer controlled and the hone appeared to automatically adjust for tight spots in specific areas of the bore.

The best evidence that it does very little in straightening out the ID is I chambered a new gain twist 6PPC Barrel two weeks ago for my LV and let’s just say the hone did a pretty poor job of straightening out any of those “squirrelyjigs in the ID that most barrels have.

You're right about the rigidity of a small vs large mandrel. I'll leave it at that, though.