P.O.U.S.'s (Projectiles Of Unusual Size)

[Alamo]

On 11/6/2017 at 2:10 PM, Sisco said:

Speaking of workable ammunition, anyone have experience with this? It looks like a good price. The rule is in effect, I bought some.

 

http://www.selwayarmory.com/bite-the-bullet-300-aac-blackout-220-gr-sierra-matchking-hpbt-subsonic-950-fps-box-of-250.html

I think I might try some of those SMK 220 gr projectiles for the next sub loading.

[Alamo]

23 hours ago, 98Z5V said:

This is very close to my standard 300BLK load, Hornady 150gr FMJ-BT and 16.1gr H110.  Excellent accuracy and good punch.

Yep, I concur... will do some accuracy testing to see how they group.

[Alamo]

Some stills from the high speed film of the subsonic 208... according to my calculations, velocity is equal to the supersonic version at 200 yards.

[Alamo]

Close up comparison of the 208 gr, supersonic on left and subsonic on right. From the stills, there is still some energy transfer going on at subsonic speeds and some mushrooming, but not nearly as impressive as at faster speeds. Energy at 200 yds is about equal to a .357 Magnum at the muzzle, which is pretty impressive.

 

 

[Alamo]

More from the slo-mo... 1st series from one of the 155 gr and 2nd from 168 gr.

 

[98Z5V]

That poor cooler is taking some punishment...  

[Alamo]

I shot the cooler... but I did not shoot the chronograph (that was my buddy Mike) 

[Alamo]

Here’s what I’m shooting them out of... it’s got a 8.5” Palmetto State Armory barrel with a 1/7 twist.

 

 

[Alamo]

I’ve made some minimum charge loads (14 gr H110) with the 155 gr version. I’m anticipating a velocity of 1525-75 fps. At 200 yards, the original 16 gr version is moving at approx 1360 fps.  Will have a better idea once I put them over the chrony, but I should be able to simulate the original version’s performance at 200 yards by setting up at around 50 yards or so.

Don’t have any of the 168 gr projectiles for conversion right now, but will try to get some minimum charge versions of those built for testing as well.

[Alamo]

The cavity created by that itty bitty Barnes bullet.

Barnes TSX/ TTSX is my go-to projectile in all three calibers that I load (.308, .300 blk, .223/5.56). It’s just too pricey to shoot for no good reason... but they sure do work like the sum of all beaches.