Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
BCM
Member Login

Site Notices
10/30/2020 2:42:12 PM
300 Blackout Master Thread (Page 65 of 65)
Page / 65
Next Page Arrow Left
Link Posted: 8/8/2020 5:22:17 PM EDT
If you have reloading equipment, but want to skip the brass-forming step, I got 500 pieces of already-formed, and primed brass for 21.6 cents per case from this website:

https://www.brassmonkeycc.com/product-page/300-aac-blk-10k-pcs

Trimming, forming, chamfering, annealing, and priming is probably all great fun if you have the time and motivation.

I was concerned that the product received would be questionable somehow - such as too-thick necks. Everything looks really good. Necks are 0.008" thickness - which is same as the necks on Winchester white box 300BO.

I ordered a second bag of 500 after receiving the first bag this week.

Range-testing it Wednesday.
Link Posted: 8/8/2020 9:48:05 PM EDT
Link Posted: 8/12/2020 8:36:35 PM EDT
[Last Edit: 8/12/2020 8:54:24 PM EDT by W_E_G]
Quick range report for the Brassmonkeyz Lake City 300 Blackout brass.
Remember this is 5.56 brass that has been cut down and sized for 300 Blackout.
Headstamps were 17 and 18.

I fired about 50 pieces today.
No problems with the brass whatsoever.

There has been discussion about use of H-110 powder, and the pressures that can happen when it gets near a MAXIMUM load.
I think I gave that a pretty good test today.
I was trying to come up with a good load using H-110 and the common "M80" 150-grain FMJ bullet.

I ran several of those bullets with 17.0 grains H-110 -- which is expectedly fairly warm load according to Quickload.
I think its actually a good bit hotter than Quickload predicts.
My gun is an 8" barrel wearing a 9" suppressor.
Quickload says this load in an 8" gun should deliver around 1722 fps at a pressure of 53,664

I got an average velocity of 1899 fps, and some pretty healthy marks on the brass.
Biggest mark was from the ejector hole - causing a significant burr on the spent case.
Apologies for the weird coloration of the pic. I had to tweak a lot of the settings on the iphone pic to get the marks to show up. Remember the gun was running a suppressor, so the cases are really filthy. Until I adjusted the color/contrast the main thing that jumped out at the viewer was the DIRTINESS of the cases.
There is a fair bite too from the extractor, but not anything that would have given me heartburn if that were the only mark.
The ejector-hole mark is exessive. I intend to back this load down one full grain, and see if the issue with the ejector-hole mark resolves.

Attachment Attached File


Attachment Attached File


Attachment Attached File


Attachment Attached File
Link Posted: 8/12/2020 8:51:51 PM EDT
[Last Edit: 8/12/2020 8:52:52 PM EDT by W_E_G]
I should mention that I fired the same M80-bullet/17.0-H110-charge in WINCHESTER cases, and I got no burr or mark worthy of photographing.

I weighed the H20 capacity of the Lake City and the Winchester (and Starline for that matter).
Each comes out to somewhere in the neighborhood of 23.5 to 23.9 grains H20.
I suck at measuring H20 in cases, so I make no representations of the consistency or quality of my water weighing.

I did notice that the 17.0 grains H-110 did cause the extractor to put a visible bend in the rim of the case.
I can never get the bent rims to show up properly in an iphone pic.
All I've got for you is this pic that sort of shows the "chomp" that the extractor put into the rim.

The bend is something to be concerned about.
It is more visible TO THE EYE when viewed from the headstamp side of the case - but that won't show up for me in a pic.
I don't think this pic really shows it sufficiently, but here it is anyway.

Attachment Attached File
Link Posted: 8/12/2020 8:56:03 PM EDT
So, long story short, H-110 will tell you when you are using too much of it.

17.0 grains with a 150-grain bullet is too much in my gun.
Link Posted: 8/12/2020 11:57:34 PM EDT
Link Posted: 8/13/2020 5:27:45 AM EDT
[Last Edit: 8/13/2020 5:33:51 AM EDT by truedef]
I've never reloaded, but have been doing a lot of studying while I am overseas.

I've watched this video a few times and thought I would share, I speed the playback up to 1.25x as its slow.

Failed To Load Title


Originally Posted By W_E_G:
If you have reloading equipment, but want to skip the brass-forming step, I got 500 pieces of already-formed, and primed brass for 21.6 cents per case from this website:

https://www.brassmonkeycc.com/product-page/300-aac-blk-10k-pcs

Trimming, forming, chamfering, annealing, and priming is probably all great fun if you have the time and motivation.

I was concerned that the product received would be questionable somehow - such as too-thick necks. Everything looks really good. Necks are 0.008" thickness - which is same as the necks on Winchester white box 300BO.

I ordered a second bag of 500 after receiving the first bag this week.

Range-testing it Wednesday.
View Quote


I saw you share this a week or so ago and ordered 500. Couldn't pass it up as primers are unobtainable and its ready to go. The only thing I am missing is a tumbler and media at the moment. I managed to scoop everything else up so these 500 cases will get me started nicely.

Thanks for sharing.
Link Posted: 8/13/2020 9:50:33 AM EDT
Right on Blackout Bro!
Link Posted: 8/13/2020 7:18:07 PM EDT
I've been working on a SUB-SONIC load for the M80 bullet.

I really like the CFE/BLK powder for 200-grain subsonics. Truly the ideal powder for the 200-grain bullets because of loading density.

Anyhow, I decided to pull a load out of my ass (with the help of Quickload) to try to come up with a "plinking" load for the M80 bullets.
I shot several rounds of my made-up load yesterday over the chronograph.
Loading density is less than ideal (~76%). But everything functioned just fine in the 8" Palmetto upper.
Velocity was lower than I had hoped, but I didn't miss it by too much. I'd prefer velocity to be around 1050 fps.
I did not shoot for accuracy. I can only vouch that the load shoots minute-of-not-hitting-the-chronograph.
I think I'll try 14.0 grains next time.
And its no big deal if a few rounds in a lot go supersonic. Main reason for this load is to just have a (mostly) subsonic plinking load using a less-expensive, and (formerly) widely-available bullet.
The bona-fide subsonic loads out of this gun are still "noisy," even though they aren't loud. All the clatter of the bolt operating is pretty significant compared to a bolt gun or such.

Anyhow, here's the Quickload screenshot, and the load data I used, and the record/average of yesterday's chronograph work.

Attachment Attached File


Attachment Attached File


Attachment Attached File
Link Posted: 8/15/2020 6:02:52 PM EDT
[Last Edit: 8/15/2020 10:58:39 PM EDT by dryflash3]
Lehigh Defense has 194-grain subsonic projos in stock

https://www.lehighdefense.com/all/308-maximum-expansion-194gr-subsonic-bullet

Not inexpensive.

@W_E_G
In the future please post this kind of info in the tacked "where to find" thread at the top of the page. dryflash3
Link Posted: 8/16/2020 8:31:27 PM EDT
So I've been slowing preparing to load 300 Blackout for the first time. I will be using some balm 200 grain bullets from Midway. Using the .250 ogive method, but I'm thinking it will be too short. They are at 2.04 OAL. Never loaded something like this before. I've loaded some photos of how it looks. The small scratch on the bullet shows where it measures .250.




Also I have N110, CFEBLK, and Lil Gun. Which should I try to work up load with first for subs.
Link Posted: 8/16/2020 8:52:15 PM EDT
For subs I use lil gun, but I'm loading up 245s and not 200s.  I'd bet it would work fine, though.  As far as bullet length goes, I've loaded as short as 2.032 with some 150s before and they fed ok after I opened to the feed ramps a touch with a Dremel.  Their profile was a bit less pointy than those, however, so yours might load fine without the need to mess with the ramps
Link Posted: 8/16/2020 11:29:51 PM EDT
Link Posted: 8/17/2020 8:44:36 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By dryflash3:
First pic is GTG, second pic OAL is too short, may not feed.

Remember .250 to the center of the bump.


View Quote



Thanks, I corrected it. Loaded only four rounds today with different charge weights to test for function. I noticed load data says a max of 8.2 of Lil Gun but people load up to 8.5 grains. I loaded one each at 7.4, 7.7, 8, and 8.2 to try out.
Page / 65
Next Page Arrow Left
300 Blackout Master Thread (Page 65 of 65)
Top Top