Cpt I have sent 3 emails to them. 3 no answer.Smile So I am going to put it on the back burnerss for awhile.And If I can't confirm the strength.I will use it for a 22LR. But in the meantime I have some good 16 and 20ga.guns I can use one of them. But thanks for all the information I have goten on this site. Whitey