Image courtesy Hornady Manufacturing
Q: I have used a Bergara Scout V2 rifle in .300 Whisper with a 420mm barrel for some time. Now I want to start reloading but have no data. I have 100 once fired Hornady cases and die set. Can you tell me what is the best powder for the Sierra 110gn JHP and the Speer 125gn TNT? These are the two bullets I’ll be using most of the time, but can you recommend a bullet and load that will be more effective on goats and pigs? I’ve been using your data for my .17 Hornet and have Lil Gun and Win-296 on hand, but will buy another powder if necessary. Is there anything I should know about problems I might strike when reloading the .300 Whisper? I’ve been told that I need to crimp the bullets? Is this really necessary?
A: Reloading the .300 Whisper (a.k.a .300 AAC Blackout) which is based on the .223 case, is pretty straightforward, and you already have the two best powders for that cartridge. A 19gn charge of Lil Gun drives the Sierra 110gn JHP at 2390fps and the same weight of W-296 gives the virtually the same velocity. With the Speer 125gn TNT 18gn of Lil Gun gets 2195fps and 17.5gn of W- 296 achieves 2110fps. Probably one of the most effective bullets for pigs and goats would be the 150gn Sierra GameKing lofted out at about 1930fps by 15gn of Lil Gun or 16gn of W-296. In order to crimp the bullets you’d first need to trim all your cases to be of uniform length, but it isn’t needed in the Bergara single shot. The Whisper’s range is limited to around 150 meters with the lighter bullets and 100 with the 150-grainer and residual energy at those distances is also reduced which only emphasizes the need for proper bullet placement