I have been shooting 168gr SMKs out to 700 yards with the below recipe. Brass - Win Primer - Win LR Powder - Varget 46 gr. I recently bought 175 SMKs to try out to 1000 yards. At the same time I decided to purchase Lapua brass to work up with this new load to try and tighthen up the brass inconsistancies. I have 2 boxes of CCI BR2 LR primers on hand, I would like to know if you would recommend using those or just sticking with the Winchester primers?