MI.sabot,
I have never had a problem with 777 and the .25 ACP plug using standard Small Rifle Primers (CCI 400) in any weather/temperature. I like the 777 FFFG for the conicals, and FFG for the saboted bullets. Never seen the need for the Small Rifle MAGNUM Primers for 777 powder, the standard ones worked just fine.
Kieth,
Ben told me he wasn't going to make any more, but I heard that he did make some more after that. I don't know for sure, but that is what I have been told. I read a post the other day that the poster said he might be making more. Only one way to find out for sure, and that is to call him. Their website was down the last time I checked.
I'm not sure what Ben is going to do, if you want one, you might want to call him and ask. I ahven't talked to him since he told me he wasn't going to make any more. I waited 5 years to get mine, it is better than any other option fro BH209, but could be bettter yet if headspaced off the front of the primer instead of the rim.