Yeah, I had a similar dog that wouldn't hunt. Built it myself with a custom barrel from big time maker. Turns out that the 1:10" twist was far too slow for 6mm lead free bullets, or long heavy weight lead core bullets. Thing wouldn't shoot better than a Whamo slingshot. Boosted the twist to 1:8" and found the holy grail. Problem was me, I had to learn about twist rates.