I have a 13" MGM barrel in .30-30 AI for my Contender. I LOVE this thing. I've used it to very good effect on whitetails, muleys, hogs, and pronghorn. A fellow on another site recommended 125 NBTs and IMR4198. I tried that and some Varget, and 34.4 grains of IMR4198 turned out to be the load for this barrel. It also shoots factory Federal 150 grain flat points very well, so I use those when I carry it for bear and oryx, though I haven't gotten to shoot one yet. Everything else I have shot with the NBTs, and so far I have only recovered one from a hog. All others, at least a dozen, have been clean pass-throughs.
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"A person is smart; people are dumb panicky dangerous animals and you know it." K as played by Tommy Lee Jones, Men In Black