RE: Ruger 77/44
I have had a few of the Ruger rifles in 44 magnum. 22 hornet, and 22 magnum. The rifles functioned well, and I like the magazine system. However the rifles lacked a bit in the accuracy department. However for the ranges you are discussing, the rifles will be more than adequate.
I disagree on the 100 yard rating of the 44 magnum in a rifle. IMO the 44 magnum is easily a 200 yard, and even out to 225 or 250 if you really know your rifle. A bunch of buffalo and other game died with a 45-70 bullet traveling at 1200 fps at some very long distances. So limiting a 44 magnum bullet that is only about 25% less weight than the standard 405 grain 45-70 bullet is just not necessary. And you can run that 44 magnum up considerably faster than 1200 fps.
You are shooting a big heavy bullet with a lot of diameter to it. The bullet makes a big hole going in, and it will also penetrate very well.
I have a couple of Marlin 1894's in 44 magnum, and I have no problem with it out to 200 yards(with open sights).
I suggest you cast your own bullets if you can pick up some WW somewhere. I can load about 1,000 rounds for about $100. And this allows you to shoot a bunch-----very cheaply!!!
Cast some bullets, or buy some cast bullets and shoot that rifle, you will not wear it out, and if you shoot it enough then 200 yards wil become second nature to you.
A 300 grain bullet would be a good choice if it will fit in the magazine.
Hunters put a lot of stock in "energy". I do not. I put a lot of stock in a big hole going in, with good penetration, and a bit of expansion. WW will expand to about .600 of an inch in the 44 magnum. And that is one **** of a hole.
For the 44 magnum out to 200 yards you really do not need a scope. However if I was going to scope the rifle I would buy the most expensive fixed 4 power scope that I could afford. Quality glass in that rifle would be far more beneficial than larger power, or a variable for that matter. Tom.