I don't know why you think the .177 isn't as good as the .22. You have to factor in a few things. The .177 shoots flatter, penetrates extremely well. I owned a lot of rifles in many calibers and the 22 hits hard but so does the .177. Most of my guns are .177 by choice. They just shoot like a laser. Caliber is not the end all be all but shot placement is and its paramount in both calibers. I have shot 5 woodchuck and every one was a one shot hit to the head with a .177. They didn’t run, they didn't move, they just rolled over. I use the H&N Barracuda extremes 9.57 and these expand to almost 30 caliber from my ballistic tests. Heavy weight pellets carry more momentum, so they hit hard, but so does a heavier .177 only with much better penetration in game. Its a balance between velocity and weight which gives great results. My HW110 in .177 is a lights out rifle. The 9.57 is doing 950 to 960 thats 20 fp’s of energy those hit hard and expand great. I also like the jsb’s 13.43 at about 820 to 830. I have shot game with both calibers including the .20 and haven't really noticed a drastic difference in taking game, they all wored if I did my part. This reminds me of the old 9mm v 45 debate. Guess what, they both work! Nothing wrong with .177. Its about shot placement in air guns or powder burners. It’s about picking the right pellet with velocity for the job.