SUPER SIZED FRIES

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I want to test them

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Sure, and load-test your truck battery at the same time!   

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Holy cow I just got back to the house and zoomed in.....50k amps rms 

Ok I took a wire wheel to the ends of em and went to measure

One had a dead short so I presume it is good idk

Then the other despite my best efforts kept bouncing around all over the place mostly reading about 430 k ohm

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I was really trying to dig in and scratch the one with high resistance idk

I only used a wire wheel on a drill I should have used my bench grinder wire wheel

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I believe that is a 50Amp fuse, the 50,000 amp listing is some other specification.

edit:  What is called "Int." on the fuse is it's interrupt rating, or breaking capacity.  That is the max. current it can safely break, without exploding or arcing over, etc.  So if there was a current peak before the fuse had a chance to blow, it's only safe up to 50KA.  It's still a 50A current rating, and should blow at around 50A, exactly how close to that should be listed on the spec. sheet.
https://www.lawsonfuses.com/what-is-a-fuses-breaking-capacity-and-why-does-it-matter/