So you are saying that Jeremy lied through his teeth about everything about Sheila and did not expect to be investigated?
And can you clarify your comment about Jeremy chose the weapon to shoot rabbits? So are you saying he would not know the power and that it would be so successful in killing humans ? I don't know quite what you are getting at?
Jeremy wanted a semi-auto that held a lot of rounds. The only semi-auto he could get Nevill to buy for him was a .22LR rifle. He had to claim he wanted a weapon to target shoot with and also to shoot vermin because those were the only potential uses at WHF. He couldn't claim he was planning to hunt bears, deer etc that would require a larger caliber rifle or birds (shotguns). The supposed use limited his options of why he could get Nevill to buy. He could not openly say he wanted to kill humans or large mammals on the farm and thus desired a larger caliber semi-auto (which would be substantially more expensive anyway) and they already owned shotguns if he wanted to shoot birds.
He would have needed to illegally obtain a larger caliber weapon if he wanted one but he figured a .22 was all he could get and he figured it would be good enough. How would Sheila obtain a larger caliber weapon anyway? He needed to pretend she used a weapon found at the farm. Obtaining an illegal weapon that could not be traced back to him and leaving that on Sheila would have set off alarms. The crux of his frame job was that she went crazy and grabbed a weapon of opportunity that was at the farm.