Muzzle loader scope sometimes have a longer eye relief. Most of the time they are just low powered scopes. I have a 4x BSA scope on a 50 caliber muzzlerloader although I only shoot 100gr of powder it has held up.

I would probably look for a 2-7 Nikon Prostaff, they have about a 4" eye relief and can be had new for under $150, I just picked up a used one for $85.

Doug
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Sticks and stones may break my bones but Hollow Points expand on impact.