Broken record time. Get an Ultradot and don't look back. I have abused mine for four years on a .475 Linebaugh and .500 JRH and it has never missed a beat. The Tascos don't have a very good reputation for handling recoil.
It worked fine on my RH in .44 mag. but when I put it on my Encore.500 mag. barrel,it shattered one of the inside lenses,so my .500 now wears an Ultra-dot.
H.H.I.#8190 Colossians 1:17 And He is before all things,and by Him all things consist!
Check out Ultradotwest.com The 30mm UltraDot is $149.99 Shipped. Add $20 for a Scope Coat with the UltraDot logo on the sides. Heather will take good care of you.