Latest activity

Hot Threads

Latest activity

 Posts Forum list
 

Filter

What's the Go-To 223 Brass Now?

K
Lapua should hit the market again soon, but with the pent up demand and backorders it may go very quickly.


I use Lapua in my bolt guns but I've had good luck with starline 5.56 and norma brass in a few ARs. Raven Rocks Precision has run some very good deals on the norma stuff in the past.
Click to expand...

Knights Armament SR25 6.5 Creedmoor

Bigjake83
Milspec Longhorn said:
Wow. Great groups - especially from the 168 GMM
Click to expand...

I find shooting 10-20rd groups easier than multiple 5rd groups, especially if you're coming on and off your rifle to load your mag after every group.

I forgot who asked, but someone asked to see some 20rd groups out of the new 18" Geissele SPR Cut Rifled barrels.

I used this as a Data Collection Exercise and treated it as a high round count 2 minute PRS stage, basically 3-4X the normal round count, so these two 20rd groups were shot with Factory Black Hills 5.56 77gr OTM one after the other and in haste but once you're locked in they just keep stacking.

I shot the first 20rd group on the right first, then moved left, you can see as the barrel temp increased the groups started to open, but it gave me a solid Data Baseline.

Now I know I can maintain MOA Accuracy shooting a Ambient Temp (71°) Barrel Surpressed for a total of 40rds.

I know this isn't Apples to Apples but I've found the same to be true with .308 and 6.5CM, but Large frame Gassers Barrel temp increases faster so I've only done two 15rd round groups for a total of 30 for Large Frame Rifles in a two minute time frame.

20250321_184452.jpg


Screenshot_20250401_115851_Messages.jpg
Screenshot_20250401_115905_Messages.jpg
Click to expand...

Firearms Craddock Precision Bartlein 6.5 cm Lr308 / AR10 upper Complete BRAND NEW

Stavey
Here’s what I have. Never had a round in the chamber. Entire upper is 100% BRAND NEW
- Craddock Precision Bartlein 6.5 Creedmoor 22” barrel .875 @ gas block +3 rifle gas bead blasted and marked Craddock Precision Bartlein 5r 6.5 barrel $765
- Aero M5 upper reciever $175
- SLR Sentry 8 detect adjustable gas block $150
- Sgt of Arms 17.5” ARCA Handguard $240
- Terminator brake $220
- Rubber City Armory HP Bolt carrier group $300
- Vltor BCM charging handle $100
$1940 invested minus tax and shipping
Selling for $1725
I’ll include a new POF 308 roller cam pin $25
As well as 2 extra HP firing pins $80
Thanks for looking
Cross Listed
Text for further info 815-343-3888
IMG_5026.jpeg
IMG_5025.jpeg
IMG_5024.jpeg
IMG_5023.jpeg
IMG_5022.jpeg
IMG_5021.jpeg
IMG_5020.jpeg
IMG_5019.jpeg
IMG_5018.jpeg
IMG_5017.jpeg
Click to expand...

Neck Tension Inconsistencies on Lapua 6.5CM Brass

straightshooter1
Rocketmandb said:
The first 45 bullets were out of one box of lot #1468 of Berger 220s. Then I ran out of bullets and had to open a new box of lot #1468 of Berger 220s. Nothing else changed. Same brass prep, same press setup, same time, same everything. Literally, all I did was get up, walk over to where all my bullets are, retrieve a new box of the same lot, and continued seating.

I contacted AMP to get their perspective and the first thing they said was, "measure the bullets."

Unfortunately, I had taken those last 45 bullets out to the hills the weekend before. Fortunately, if you want to call it that, one of those rounds had a bad primer. So, I pulled that one bullet and compared it to a few bullets out of the new box.

What I found:
- The OAL was essentially the same.
- The body of the bullet was ~.025" longer on the new-box bullets - measured by putting a comparator on both ends of the bullets.

Looking at the graph, you can see that the new-box bullets engaged around .025" earlier. That makes sense if the body is longer. You can also see that the slopes of the graphs are essentially the same. The reason the terminal forces on those bullets is higher is that there is more bearing area. In fact, if you just slid the orange plots to the right, they would match up.

EDIT: Morale of the story, measure your bullets every time you open a new box.
Click to expand...
Apparently, when you refer to the "body of the bullet" you're referring the the Bearing Surface.

Several years ago now, I discovered this difference in bearing surfaces between lots with two different lots of 168 SMK's where there was a difference of .033". So I sorted through them and set aside 20 that were .033" longer than 20 of the shorter. Loaded all 40 up and shot them into 10 round groups and chronoed all the shots. As I thought there might be, the .033" longer bearing surface rounds had a very different average velocity and a very noticeable difference in POI at only 100 yds.

Like you, I discovered it's a good idea to sample measurement for every new lot/box of bullets as there can be significant differences. But I'll point out too that the difference in bearing surface length being quite quite small, like .010" or less, isn't really isn't going to show up on target or in velocity due to all the other noise that's going on.
Click to expand...

Opinions on VV N540 powder for 223/5.56 hand loads?

st1650
N540 is pretty good for heavy 223s. Give about an extra 25-50FPS over varget for the same pressure out of my 77TMK loads, accuracy was similar, tad worse than varget but SD wasn’t as good.
I was loading 25.0gr for a bolt gun load at 2.475in with the 77TMK. Lapua brass, CCI 450.
Apparently it reduces your throat/barrel life faster than N140 and Varget.
Click to expand...
  • Like
Reactions: MustangGreg66 and simonp
Load more
Top Bottom
Back
Home
Forums
Merch
Alerts