Over a offseason:A huge part of it definitely needs to be training in the specific environments. But there also must be some great ways to learn and train fundamentals at home, or at the 100 yard range. I know what my range limitations are, I am just not sure how to best utilize what I have available to me.
Get a good video training course like Modern Day Sniper to at least have a solid training education. There are many variants and methods, but I found his practical.
Build and break field position drills at home with dry fire 3x a week. Get fast and confident. Learn to break a trigger without moving the rifle.
Use Form’s paper test, standing, kneeling, sitting, prone. Repeat regularly to test yourself at the range. Save all the targets in a book.
Build and break with a 22 LR at 25 and out to 300 if possible. Thousands of rounds.
Build and break with a .223 hundred of rounds as far as possible.
Build and break drill with your hunting rifle, 100-150 times as far as possible.