Recoil is definitely a thing on modern in-line muzzleloaders. I used a Primary Arms 1-6x on one several years ago. It wouldn’t hold zero either. Ended up selling the rifle when New Mexico banned scopes on muzzleloaders for hunting. I calculated the recoil energy on that gun once and it was 2x the recoil of a 9# 300 win mag.I actually looked at the Swaro Z3 when I first started looking...based on swaro reputation. I have since read some things about this particular model (Z3) that leads me to believe it may not be appropriate for a muzzleloader. Reliability/ability to take recoil is my number one consideration here.