My insert was made by Zimmerman. The external dimensions of the insert were just too small to handle 8X57JRS. To clarify, the insert didn’t fail while shooting. But I could see it was going to happen so I cut the insert into little pieces. It didn’t harm the host drilling in any way.
Now my maximum insert caliber is 22 Hornet. If I wanted a larger rifle caliber I would choose a permanent liner in a shotgun barrel.
I just bought a 16X16X6.5X58R Meffert drilling. My plan is to line the 6.5 barrel to 22 Magnum. It will be my small game gun.
