If the weather conditions are right, you have the right bullet design and weight, and you have the skills and experience for the shot knowing you will hit the mark, there is nothing wrong with taking the shot. Using a 30-30 bullet heavier than 150 gr. like you did for a shot that distance was wise.
I have said this before, and your experience is proof - most rifle deer hunters would be well served with a 30-30. A lot of experienced deer hunters really like this round. IMO, it is also great for beginners - lower recoil, is a good deer cartridge, and it will not go into the next county if they miss. I am fond of the 30-30, as I took my first deer with dad's 30-30. Yes, I own and have taken deer with other .30 caliber cartridges; but I also own a 30-30. It is a great deer cartridge, and it can also work well on mountain lions.