berger MEF varmit bullet question

[Evan03]

picked up a box of these a few days ago, i hadnt seen them being advertised as being prefragmented, but on close inspection the jacket seems to be prestrestressed. you can see lines and feel them going the lenght of the the jacket. theyre even pronounced enough that you can feel them with your finger nail.

if they are prefragmented that would go right along with theyre name, maximum exspansion factor. i picked up some weigh 55grs and theyre a flat based bullet.


also what ive you guys found when loading these bullets.

thanks

Evan