"...Maybe Bullseye..." Geezuz, NO. No guessing allowed. Unique, H110 and 2400 are .30 carbine powders, but not Bullseye.
You absolutely must slug the bore and make a chamber cast. It's entirely possible that your granda made his own wildcat based on the carbine case. It may have been one of his 'projects'. Assume nothing.
Unless you can find your granda's loading notes, assuming he did make notes, you may be best to hang the rifle up in a place of honour. Carbines aren't rare, but if your granda was playing with that one, it'd be a fitting tribute.
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