[TaZ]

"..it's a scoped bolt-action rifle.."

Yeah, that's what a real sniper would use, not an AR-15.

A lot of shooters I've known have had .223 bolt-action rigs that could get small groups at 500 yards.

At 100-150 yards it could even be a Thompson Contender....which also would be very easy to conceal.

Whoever this murderer is, he is a very cold, calculated, trained hitman....sounds like military (terrorist camp trained?)....this is not your usual psychopath....someone who is emotionally and mentally unstable.

He isn't leaving any clues and has flawlessly planned his exit everytime.

Even with help, this indicates a plan....

[Robert_Paulson2]

"At 100-150 yards it could even be a Thompson Contender....which also would be very easy to conceal."

I suspect this too.