Is is possible that the term "frag" indicates that these BB's are intended for use in things like 40mm and tornado grenades? I have used BBB's fairly often and, although they were always the dbl polish, I have never had a problem with them.
The only time I have ever seen a feed problem like that was when the mag was over loaded or, When I first started in this sport and tried to use the BB's from crappy tire.
I'm just spitballing here but, I thought I might be something to consider.
"Si vis pacem, para bellum - If you want peace, prepare for war."
I do not fear the valley, for I am the shadow