Well I am shooting where I shoot everyday so I know the ranges, drop, etc. It isn't as hard as you think. My 350 is the second springer I bought so it is well worn in now. I should post some pictures of the target I was shooting yesterday when the weather got really nice. I was putting tons of shots in a quarter sized area at 35 yards. I want to try another shot at a possum from the deck so I want to be sure the gun is sighted in well, that I practice, so I have confidence in the shot.
I've been practicing longer shots for my summer prairie dog hunt in late May early June! I was shooting my gamo squirrel at over 60 yards and knocking it down consistently. Now I seriously doubt it will be that easy in Kansas as the winds out there are horrible. I'm going to have a range finder before I go out there.
Between the 350 and the TF 89 all my other guns feel like toys! I think the secret to magnums is just shooting them a lot. I did a home lube on my TF 89 which has helped it a lot. Now the problem with shooting them is they can tire you out cocking them until they get worn in. When I first got my 350, about 50 shots was all I could stand. It actually bruised my shoulder!