walther cp88 competition co2 low power

Hello everyone im new to this forum.I just got this co2 handgun walther walther cp88 competition co2 and i was expecting much more out of it.I thought that it could break a glass bottle at 10 yards , or penetrate a water bottle at the same distance.I tried doing the aforementioned and it failed.However i had success when i brought the barrel very close to a listerine(mouthwash) bottle , the pellet didnt pass throught the bottle , but it stayed inside (it passed only the one side).Is there anything wrong with the gun or this is how its supposed to work?Thanks in advance!
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BBs are made of steel. Pellets are made of lead. The pistol in question has less than 4 foot pounds of muzzle energy, and at 10 yards it is under 2 foot pounds. That will not break a coke bottle! It might (?) if the projectile was a steel BB, but you can't shoot BBs in that specific pistol. 

Big5 has a CO2, Beeman rifle on sale for $99 this week. There is even an on line coupon for additional savings. That CO2 rifle is closer to 7 foot pounds at the muzzle, and will easily break a coke bottle at 10 yards. You get what you pay for. If you want something better, but not spend a lot, buy a Benjamin 397 or 392. And I wouldn't think about a Nitro piston anything.