Training Experiment Question

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I'm doing 5/3/1 currently, next time I bulk I'm thinking of doing the same routine but with more reps, basically a 15/10/5, until failure on the last set and all of that, having the same progressive overload each week.

What kind of results can I expect from that? I've always been curious how my body would progress. Bodybuilders use higher reps in their training, but will I really appear that much more muscular?

Will my muscular endurance increase? I'm thinking my maxes would progress, not as fast but they should progress.