Only you can say.
I'm in my 70s too, and as much as I love my .357 mag revolvers, I download them for 'fun' shooting at the range and they do not hurt me. Not down to 38 Special level, but 125 grain JHPs at ~1100 ft/s are pleasant and use much less powder than real 357 mag loads.
If this is a class, not a match, you are probably not shooting for score and do not need to 'make power factor'; the bullets just need to hit where you aim them and either ring steel or punch through cardboard.
If you have enough moon clips or speedloaders, and a less=than-full-house load your GP-100 likes, the worst that happens is people tease you about living in the last Century. We can cope with that, no?
If there is a recommendation for a second gun, can you take both the Ruger and the HK and enough ammo for both, and just see how it goes?
I admire your spirit and wish you well with the class.
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