"spysir" I once upon a time shot afew Hog's with an old Career 707II .25, all head shots , all dropped in place. It was a fairly hot shooting rifle ( about 90fpe) only the first 5 shots could be counted on but I never shot more than one in a day so that was fine.
WITH proper shot placement ( and I certainly scoped in a LOT more Hogs that I got a shot at and all were shot just below the eye) no worries. You DO need to know what proper shot placement is for any given animal.
Can "it" be turned up in power, why certainly. It only cost time and or money. It will also cost you shot count.
"I" haven't had the chance to shoot the BSA Coyote yet. I have heard the trigger may not be the very best? Getting the trigger on the old Career 707 "usable" was a bit of a challenge, luckily they were being used in Field Target back then so springs & such were available.
To me the 909 .45 is NOT a good out of the box hunting rig as the trigger is VERY bad. Again this likely can be overcome with money.
Is there any chance you can get your hands on one and test fire it before buying? Power is certainly not the only consideration in hunting and you may find it is the perfect rig for you, or, discover just the opposite.
John