Northern, that is one nice bull, and nice shooting especially with a rifle you are not used to!

Find youself a good double rifle, and set yourself up to hand load for it. That 470NE factory ammo sells for $380 USD per box of 20, that is $19 USD per shot, so handloading is a real idea for that reason, and so you get the very best your double has to offer regulation wise.

.......................Congratulations sir!