Where 300 Whisper and 300 BLK collide

[Rancid Coolaid]

I am on my third 300, the first 2 were dedicated 300 Whisper (prior to the BlackOut), the newest is a 12" blackout upper.

All my shooting is with reloads, various recipes, all subsonic.

The first 2 shot OK, grouped well at times, threw fliers more than I wanted.

The newest 12" SBR (barrel from Spook) in 300BLK, shooting rounds built for my 300Whisper, all reloads are using Whisper dies. The new upper shoots great, much quieter than the 8" upper, much more accurate and reproducible than the 16" or 8" prior 300s. Strangely, the new 300BLK shoots whisper ammo better than any 300 Whisper I have owned/shot.

Maybe one day, there will actually be 300BLK ammo to buy; till then, my gun and I are happy with 220SMK and 209 Amax, both at 1025, both shooting well under 1 MOA at 100 yards.

If you don't like how your Whisper is grouping, consider a BLK barrel swap, it worked great for me.

[i8asquirrel]

Nice looking rig!!

[Spook]

The blacksheep chamber is so unbelievably similar to the whisper I'd doubt it is what made the difference.
In my mind the "difference" between the two is so negligible ...there might as well not be any.

[Mike Bell]

What about Hornadys new whisper ammo? They are saying that you can shoot it in both chambers? But the whisper ammo has a longer case length...hows that working?

[rsilvers]

Hornady Whisper(R) ammo has a 300 AAC BLACKOUT case length.

The AAC 9 inch upper was tested at an average of five consecutive five shot groups - 1.1 MOA - Berger 110 bullets. Sierra 110 bullets were about 1.2 MOA.

A 16 inch fixtured test barrel, 1/8 twist, with a 300 AAC BLACKOUT chamber - 0.8 inch group at 100 - Berger 110, again, 25 rounds. Sierra 110 was 0.9".

Just to be clear - these are not BS 3 shot groups. These were 25 shots total with all counted.

[Spook]

Originally Posted by rsilvers

Hornady Whisper(R) ammo has a 300 AAC BLACKOUT case length.

The AAC 9 inch upper was tested at an average of five consecutive five shot groups - 1.1 MOA - Berger 110 bullets. Sierra 110 bullets were about 1.2 MOA.

A 16 inch fixtured test barrel, 1/8 twist, with a 300 AAC BLACKOUT chamber - 0.8 inch group at 100 - Berger 110, again, 25 rounds. Sierra 110 was 0.9".

Just to be clear - these are not BS 3 shot groups. These were 25 shots total with all counted.

rsilvers can you explain "fixtured test barrel" please I'm a bit mystified. Thx

[Titleiiredneck]

Originally Posted by rsilvers

Hornady Whisper(R) ammo has a 300 AAC BLACKOUT case length.

The AAC 9 inch upper was tested at an average of five consecutive five shot groups - 1.1 MOA - Berger 110 bullets. Sierra 110 bullets were about 1.2 MOA.

A 16 inch fixtured test barrel, 1/8 twist, with a 300 AAC BLACKOUT chamber - 0.8 inch group at 100 - Berger 110, again, 25 rounds. Sierra 110 was 0.9".

Just to be clear - these are not BS 3 shot groups. These were 25 shots total with all counted.

What distance, 100 yds or feet?