I am a bit confused about what it is, specifically, you are talking about, when you say "thin web". The web is the thick part, forming the base of the case, and seems an unlikely spot for a blowout,. even if not fully supported by the chamber or bolt. The thin part at the "top" of the web, where the thick web turns into the much thinner case body on the other hand is a much weaker spot.
I have no idea what the early specs on the .350 Legend were, what is given now shows a case head (where the web is) having a diameter of .390" with a rebated rim measuring .378" diameter, which fits the standard .223 AR 15 bolt face.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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