The belt on a powerbelt does not stay attached to the bullet. It's designed to fall away quickly and it does. I've never had any accuracy issues with the 325gr elr bullets with the mz-rex brakeLR Customs is right..........
The ELR's are well known to cause problems when shot through a brake. CVA has had 2 or more revisions to brakes and still, owners are just removing their brakes and saying 'to heck with it'. However, get rid of the ELR's and shoot a good bullet, bullet to bore and the brakes work.
There are a lot of great bullets that can be used..
I'm going to attach a photo that will clearly show what happens when plastic goes through a brake, in this case a radial brake. Its clearly evident that the base of sabots are shredded when shot through a brake. This is exactly what happens with the ELR, except..... the skirt remains attached to the bullet, unlike a sabot. There goes accuracy.
Its easy to see which were shot through a brake and those which were not.