The scope used by Canadians is either (earlier) the Leupold 4-16x40mm LR/T M1icon or (later) Schmidt & Bender 5-25x56 PMII. The standard M33 ball is not used. The kills were made with an undisclosed match-grade round specifically developed for the purpose, so we can't actually be sure of the velocity or bullet weight. And yes, ALL long range kills involve a certain amount of luck. However, 3 of the 5 longest confirmed kills to date have been made by various Canadians. They seem to be especially "lucky".