Your 30-30 is like you said a good “brush gun”. You aren’t going to be able to shoot really acurate over 150 yds really. I think your 380 is a little over kill, but would get the job done. I suggest using a lighter grain bullet…and one that doesn’t expand rapidly. I’m assuming you will hunt deer and you don’t need to leave a big hole. The shot gun is also a very good weapon…but again range is limited.
If you are looking for a gun…I’d say 30-06 or 270 or 243 would work out just fine…