SD

That working load is for the 458 win mag . I also have a friend that shoots these out of his 458 Lott . Not to sure where they seat the bullet . Another friend shoots these in his 45-70 for sub sonic loads , what type of single shot he has I do not know . I also questioned him about the 45-70 , I did not think it would work .I guess it does .Have a good one .

RR