Your choice for weapon was fine, and the 125 grain bullet would have done fine with a direct shoulder shot.
I use cast bullets of 160-175 grains, 28 grains Re-7, a shoulder shot and everything is dropped in it's tracks, including 240 pound pigs.
The ear;ier comment regarding shot plaxce emnt was also correct better hogh than low, and sagain, I'd move it forward 4" too. there's just not thatmuch meat l;oss with the shoulder shot, and I've never had to track a pid or deer OR elk from a 30-30 round placed there using my own cast bullets.
I like to see kids start right and make it EASY on Dads too.
If I can help from Texas, let me know .
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