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loads for 300 black out

29 Sep 2016
@ 12:03 pm (GMT)

Rodney Middap

Has anyone have a Ruger 300 black out and if so have u worked up any good subsonic loads in the 125 gn weight.At the moment i am using 165 gn cast Hawks bury River 6.4gns trail boss and they are shooting quite well at 1050fps.Has anyone tried any adi pistol powder in the black out or 300 wisper ?


29 Sep 2016
@ 07:45 pm (GMT)

Nathan Foster

Re: loads for 300 black out
Hi Rodney, it doesn't really matter what you use. Due to the fact that all conventional hunting bullets behave like FMJ projectiles at subsonc speeds.

If the goal is always 1000fps and we know that expansion is non existant, then the highest BC bullet (versus twist rate) wins.

Wounding performance is simply no longer a part of the picture. The ability of the bullet to kill at these speeds, comes down to whether you can connect with the spine or brain.

To really make this cartridge work (killing) at sub speeds, projectiles would need to be identical to the Winchester .22LR subsonic hollow point. The lead would need to be very soft and like the Phil Collins album- no jacket required.

30 Sep 2016
@ 05:34 am (GMT)

Mike Davis

Re: loads for 300 black out
try some of the cast ones from Robert in Tokoroa..he sells on trademe. the 150s are just as Nathan has described. I use them in a x39mm for grins n giggles.
22 Dec 2016
@ 08:38 am (GMT)

Mike Davis

Re: loads for 300 black out
rightho.....knew it was in here somewhere
I have finaly got my subsonic loads sorted using the 151 grn hollow point cast projectiles mentioned above......
cci std large rifle primer
4.1grns trail boss powder
they are quiet enough for me through my tired gunworks spartan suppressor
dropped 4 lambs for Christmas dinners all neck shot at around 20-30 yards
recovered 1 projectile and that has mushroomed simply awesomely with width of 14mm giving nearly 100% increase!!!!
now the projectiles are good as they come but being a bit of a tootoo bug by nature I doctored a few by adding 4 slits around front edge of hollow pint to depth of about 2mm using a stanley knife (we did this to .22lr for years before winchester power points came out)
I believe it helps by making the begining of opening really easy
usual cautions for me,safe in my rifle,use at own descretion blah blah blah
shot 2 goats front on at 5 yards the other week and neither projectile made it back into neck!!!!!! thats what I was trying to get...a 150 grn pill that expands and stops quickly to reduce risk of projectile carrying onwards as they bounce like crazy at subsonic speeds.
22 Dec 2016
@ 07:05 pm (GMT)

Nathan Foster

Re: loads for 300 black out
Thanks for sharing this Mike. Yes, I remember doing the same with .22 bullets many moons ago as a young lad.

To others, the key factor here is - no copper jacket to prevent expansion at low speeds. Having said this, a round or blunt nose form will not cause mushrooming or any hydraulic / mechanical wounding beyond a single hole caliber sized hole. So any wide hollow pointing etc helps to weaken the front section and initiate energy transfer in the form of trauma. I believe the earliest noted example of this bullet type was the Gould Express hollow point mold, era 1890's. I believe Express was the word used to generalize a hollow point at this time. It was a short time period, soon lost to jacketed bullet production.

Add a jacket and it all goes tits up. Make the bullet from pure copper and its worse still.

None of this is new. It is simply forgotten. I sometimes think that it is inaccurate to state that our understanding of terminal ballistics has grown or evolved. We seem to make changes, then spend the next so many years trying understand the choice. Odd indeed. But I do hope this site helps along with contributions as per your posts.


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