Morning

Does anyone or has anyone bought or used a scope aligner kit on their blackpowder rifles scopes?I bought this Nikko sterling scope aligner kit yesterday after not having such a great range day on sunday.To basically start with a process of elimination,and by saying this I am not blaming my rifle as there is a lot of factors to consider.I just want to know how accurate this system is,as it is suppose to be a shot and time saver and should get you within the 90-95% accurate range on a target set up at 100mtrs.Of couse there might be a bit of fine tuning on the range as eveyone's eyes are different and some of us are left handed shots,and also taking the bullet weight and the powder measured into consideration.