Roger's right,...with a magnum powered rifle, you're going to need a sturdy scope like the Hawke scopes. They are really good 'glass' for the price. A step up from the Center-Point scopes,....and I'm a big fan of CP's too. It all depends on the condition of your rifle,...tuned or factory. For extra hold,...You'd be well advised to invest in a UTG scope rail made for the Diana rifles. But before you pick one out, put a set of rings on the factory rail for now. Place a 1" dowel in them where it sticks out over the barrel and check for any "barrel droop" and barrel alignment. I use a telescopic aluminum paint roller handle. Then you'll know if you need either the "zero" compensating rail,...or the one with droop compensation. The UTG's will fit right on top of the factory rail so if you prefer a low set scope, low rings are a must. This rail will give you a very sturdy foundation to work from before you set some rings and glass to the rifle!!!!! Best of Luck, tjk