For quality, accuracy and fit, the two top springers today are the Aa TX200 and the HW97. For target shooting most prefer the .177 but if your pesting many prefer the .22 cal. My own oersonal favorite is the TX in .177. Mine shoots 900 fps with the AA 8.4 gn pellet, very smooth shot cycle and fits me like a glove. If I were younger and doing a lot of offhand shooting, I would prefer the MK 2 version as it has less barrel weight and a better balance. This is where the HW 97 shines, better balance for offhand shooting in my opinion. The 97 is more difficult to work on your self, well not really, it is that the TX is just so easy and simple. You mentioned a model 48...great rifle, I had one few a number of years, very accurate, great power!! More efficient in .22 cal but can be detuned a little and turned into an awesome .177 cal target rifle.. Any of those I have mentioned should shoot 1/2" groups or better at 40 yds with a good tuneup. Adjusting that stock to fit your hold style will add greatly to how well you can shoot a particular rifle. When the gun is smooth, consistant and fits so you can repeat your hold each time, you will be able to hit just about anything you want!!!