Arken ep5 and 50bmg

Hello I just got a noreen ulr 50bmg 30 inch barrel will a arken ep5 5x25x56 hold or vortex viper hst 6x24x50 any info will help thank you
I had a viper HS T on my 308 and I crapped out in less than 50 rounds. So I would try the Arken first. I have a swfa on my 50