300 Blackout/300 Whisper Reloading
 

I would like to know if I decided to go over to the 300 Blackout, will my 300 Whisper Brass and Dies be the same? Where would I find 300 Blackout Load Data and infromation?

savageshooter.com,castboolits.com and go to group buy discussion fo cast bullets for ar, Delta company Arms L.L.C., and silencer talk has a lot of info. From everything the companies are puting in there it will open .004, shoulder the same, slightly longer throat, could shoot whisper in BLK. but not vise versa due to more free bore and would cause high pressure. Noveske barrels are compatable - check out web site. Also check out conversion to 300 BLK reamer on this website... Hope this helps

I take it you are guessing your chamber is the cause of your problems?

Problem?????

I do not know what the problem is but I have tried everyting I can think of and much more with the suggestions from this forum. Just can get it to shoot under 3" at 100 yards.
The manufactorer is not much help as everytime I correspond with him......Its always something I am doing wrong that makes it not function properly.

I thought it was an accuracy issue not a function issue.

Did you ever put any ammo over a chronograph?

Function was never a issue, accuracy at 100 yards is. Never had it group less than 3". Never use a chrono. Tried a lot of other suggestions like powders,coal, bulletts. Factory Corbon 220gr ammo..........SAME RESULTS. That is why I was contemplating giving up with the Whisper and trying the Blackout. I am open to other suggestions.

Have you tried having someone else try shooting groups with it?

I would invest in a chronograph if you are going to play with reloading subsonics. They can tell you a lot about what your bullets are doing.

go back to basics. start with checking your mounts and scope rings make sure they are secure. then I would try a supersonic load that has proven to be accurate. Then I would make sure I had a very good steady rest , sandbag if you can..what action AR you using? what barrel?

Based on the 6 bbls I've been testing (4 300AAC and 2 300 Whisper chambered) the Whisper chamber is more accurate with supersonic loads because the BLACKOUT has a much larger and longer throat area to accomodate more fouling build-up from suppressed firing. I can see no obvious difference in pressure signs between the two chambers. Ammo loaded using Redding 300/221 dies and Forester 300 BLACKOUT dies both work just fine in either chamber.