08-30-2022, 09:48 AM
(This post was last modified: 08-30-2022, 09:53 AM by lazyengineer.)
I use 4166 in 6.5 CM with light bullets. Not most optimal velocity, but good enough and gas operated guns really like it. Basically, it's usage appears close to 4064 - and so a bit bulky for Grendel - or so I thought.