Both samples of dried berries can be ground to < 1mm by using our Variable Speed Rotor Mill PULVERISETTE 14. We recommend using a sieve ring with reinforced edges for longer durability.
In our first trial, hard and dried berries have been precut to < 5mm length. Also a hammer can be used for manual pre crushing.
Complete amount of sample has been fed within 35s. Sieve ring and rotor use to remain free of sample, a grinding of higher amounts should be possible too.
Probably sample does not need to be pre crushed when a sieve ring with reinforced edges will be used (see result 2).