Uhf repeater antenna question

I'm in the process of setting up a GMRS repeater (460 uhf) and I have a feed line question. I'm going to be putting out 50w at the repeater. I understand the importance of a quality antenna and feed line. With that being said, I have RG8X that I'm planning on using. It's a 30' run from the repeater to the antenna. With all other things taken out of the equation for this discussion, just focusing on the feed line - is this a bad idea? Obviously, using something like LMR-400 would be better, but I already have the rg8x. Am I going to see a major loss in performance with the 8x? Thanks for your input.





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