450Bushmaster.net

I was looking for a good plinking load that would allow me to get some range time in without breaking the bank. I have a cast bullet from a Mountain Mold that I designed for a custom revolver chambered in 45LC. The mold drops bullets weighing 310 grains and measure .453”. I powder coat and size to .452” for my revolver, so I loaded some of the bullets up for my Bushmaster using AA1680.

Loaded to an OAL of 2.110”, my 40 grain load produced the best group of .918” at a velocity of 1875 fps. All rounds fed from a factory Lancer magazine and with a kinetic energy of 2405 ft/lbs, I may try this round on some boar this fall. Barrel was pristine after all rounds were fired with no signs of leading.

That's a really nice plinking load!
By the way, Welcome!

A little thump to the plink lol.

Probably about the best cast load I've seen from a AR.

I saw this post and it inspired me to try the Lee 457-340 grain bullet. My loads are fairly similar to yours, but the accuracy isn't there. I wonder what the difference is?

What are you sizing the bullets to? I sized these to 452”.

I size to .452 as well. I did end up getting a little better accuracy by lengthening OAL, but still get a flyer once in awhile. I'll have to visually inspect and weight each bullet I think to get more consistency.

What's more interesting to me is that I'm getting the same velocity as you, 1875, with 340 grain bullets and 37.5 grains of Shooters World Blackout. I thought 1680 and swbo were more similar than that.

Rklenke wrote:What's more interesting to me is that I'm getting the same velocity as you, 1875, with 340 grain bullets and 37.5 grains of Shooters World Blackout. I thought 1680 and swbo were more similar than that.

while you can use 1680 data to extrapolate load infor for SWBO (Lovex DO-63.2) - its just a smidge faster than 1680.

discovered that long before SWBO started private labeling it and selling it commercially here in the states. I was sourcing it from a local boutique ammo maker here locally who was using it for x39 supers and blackout subs.

i had to download my subsonic blackout loads by a few tenth's of a grain to maintain my velocity i was getting with 1680.

as i understand it, Lovex (a Czech company) used to make 1680 for AA back in the day but lost their production contract for some reason. so they modified the formula enough to appease the lawyers and do-63 was born, and then SW decided to private label it for commercial retail sale here in the us.


it sure does burn a lot cleaner though, and i mean.. having to use less powder for the same velocity and cleaner = win/win/win to me!

plant_one wrote:...snip...
while you can use 1680 data to extrapolate load infor for SWBO (Lovex DO-63.2) - its just a smidge faster than 1680.

Where does Hodgdon CFE Black fall compared to those two?

Hoot

ive personally done zero testing at all with cfe blk. ive just not found a need to add it to the shelf.


according to the most current (2017) hodgon relative burn rate chart i can find CFE BLK is slower than 1680 is...
(#69 = 1680, #70 = CFE BLK)

i have yet to find a similar chart that includes SWBO and or D0-63 reference on them

https://www.hodgdon.com/wp-content/uplo ... -color.pdf
https://www.hodgdon.com/resources/data-sheets/




hth