I am looking to buy a spotting scope. I will be using it primarily when shooting a .22 rifle at 100 yards. Will the Bushnell Spacemaster 15-45x50 be adequate for this? I've read some good things about it on other threads. I can afford to go up to something like a Kowa 661 if I have to, but I like the price and size of the spacemaster. Any thoughts?