I have personally seen 2 Model 59’s with cracked receivers. Both were very well used. They were (are) still being used, but I certainly wouldn’t recommend it.
I don’t know what the history was on either, so can’t comment on the issue of ammunition.
For my own Model 59, I use it sparingly (once or twice a season) and shoot light target loads for Gambel’s Quail.
If I need to shoot heavier loads for anything, I’ll use a steel receiver gun (Model 12 or Super X 1).

I have several Model 59’s and the newer, hotter loads will crack the receiver horizontally. I would highly encourage you to keep with the lighter traditional loads. I have not tried it yet, but I think the Model 59 barrel will fit on a Model 50 base gun. This would yield a gun weighing somewhere in the middle but allow the hotter loads.
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