A .22 pellet will have more mass and generally pack a harder punch. Take a look at the Benjamin Trail NP, around 200 bucks, hits like a mule, is very accurate, and can throw a heavier pellet.
These are fine rifles. They can be made much better as well
with the trigger upgrade mentioned above.
They use the newer technology gas pistons. Like found on the
hatchback on your vehicle.
They are shrouded also, makes them a little more quiet.
The .22 is about 30 bucks more, but worth it.
http://www.pyramydair.com/s/m/Benjamin_Trail_NP_Nitro_Piston_air_rifle_combo/2049#sSpec
Over penetration with the .177 is a real problem even with the
heavier diablo shaped pellets.
For hunting, try the Predator pellets. They are not hype, they work.
Hits hard like a wadcutter pellet does but has much better ballistics.
Very devastating, even more so in .20 and .22 cal
The energy is used up ripping and tearing instead of just passing
through.
But, like most air rifles. They have to shoot well in
YOUR rifle.
http://www.pyramydair.com/s/p/Predator_177_Cal_8_0_Grains_Pointed_200ct/352
They do cost more, but they are not for paper punching,
strictly hunting.
Once you dope your scope, you can quickly make corrections for any
point of impact changes between your plinking pellets and the Predators.
Just dial in the clicks when you go hunting. Of course, it is well worth
the expense of a pellet to check point of impact after doing so.
Don't get caught up in the velocity hype. Pellets in all calibers usually
perform best when limited to the 850 to 950 feet per second range.
What has two thumbs and loves air rifles?
This guy. :dblthumb: