300 Blackout - Heavy Supers

dubious

dubious

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Anyone know where i can find load recipes for heavy 300 blackout bullets that are at max pressure?
Most reference info I've found online above 180gr seems to only list sub sonic load data.

Would love to know what the max load is for 220gr ELD-M with H110 or CFE BLK

i.e.

Fdalq5R.png
 
I use Gordon's Reloading Tool for stuff like that. I am big into .300 but I can't say I have put much thought into that myself. With a tiny 7.5" barrel it doesn't really make sense. If I ever source something longer maybe, 1500fps isn't bad.
 
Yeah my barrel is not much longer at 10.5" (bolt), also 1:7 twist so I'm curious to see what's possible in the mild supersonic at 150-200gr. Hopping to find something MOA at 100y


Here's some max load data I found from Hogdgon:
(fps for 16" barrel)

110gr - - - - 2300fps (CFE BLK)
125gr - - - - 2200fps (H110)
150gr - - - - 1970fps (H110)
168gr - - - - 1890fps (CFE BLK)
180gr - - - - 1800fps (CFE BLK)


Can't find anything above 180gr other than what Legi0n mentioned:

208gr - - - - 1500fps (CFE BLK)


And I have to agree with IDCAY on the 220gr bullet, speed at 1400fps is probably accurate and too close to sound barrier to be stable, specially with my short barrel and lower fps
 
150gr bullets can be pushed to roughly 1800 fps, which is a lot more useful.

Posted before I looked at the post above. :( Ah well for a WAG I wasn't too far off.
 
there is a caveat on the 208gr/1500fps: the powder is so compressed that it may push the bullet out slightly if stored for a while
I have shot the ammo within 12 hours of making it
 
mudgunner49 said:
I get 2000 FPS with 150's and L'il Gun out of my AAC Handi-Rifle with a 16" barrel...
Click to expand...

Lil'gun is great for absolutely top speed. It also puts out a lot of heat, so much that I won't use it. H110 gets within 50-100fps without getting your barrel glowing after a couple mags. That's an exaggeration of course but really, what's with Lil'Gun?? Probably not an issue for you from a single shot...
 
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B said:
Lil'gun is great for absolutely top speed. It also puts out a lot of heat, so much that I won't use it. H110 gets within 50-100fps without getting your barrel glowing after a couple mags. That's an exaggeration of course but really, what's with Lil'Gun?? Probably not an issue for you from a single shot...
Click to expand...

Agreed 100%, and if I were using a semi-auto it would be a consideration. I've used H110/W296 with great results, but LG (which I have a bunch of) gave me significant velocity gains and better accuracy and I don't possess the requisite dexterity to enable me to reload fast enough to cause an issue with the single shot... LOL
 
mudgunner49 said:
I get 2000 FPS with 150's and L'il Gun out of my AAC Handi-Rifle with a 16" barrel...
Click to expand...

that is correct
150gr seems to be the bullet weight threshold dividing the "conventional powder loads" and the "hotshot CFE-BLK"
I was impressed when I could drive an 180gr bullet to 1800fs (16" bbl) with CFE_BLK
the AA-1680, H110 and LilGun didn't get that fast
on the other hand, CFE-BLK with light bullets is a waste of powder

oh well, there is satisfaction in reloading ... off the chart if I may say so myself
 
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