Benjamin bulldog 170 grn ?

AlanYou might try Eunjin and/or Air Venturi as sold be suppliers herein. 

If you really want to make an impact, try the Eunjin 220 grain pellets (they're not bullets as they are skirted). The last pig I shot, had an exit wound you could stick your fist through!

Interesting what range was the shot and what kind of accuracy are you getting
 
Shin Sung airguns are not known for accuracy, but I can't complain—the gun was given to me! Nonetheless, groups are 2 inches or better at 50 yards, depending on the pellets and/or bullets. 

The yardage to the pig was about 20 yards, perhaps bit less. The gun is noisy even with the LDC, but the impact in this case was louder! 

Alan