Skip to main content
Topic: Alpha Munitions Brass (Read 1173 times) previous topic - next topic

Alpha Munitions Brass

A week ago I received 200 pieces of Alpha 6.5 large primer brass. Decided to do an analysis today and got my socks knocked off. If I had not done the measurements myself and someone else reported these numbers, I would hesitate to believe the results. 😊

Weights were taken on a Sartorius Entris 64 analytical scale (accuracy +/- 0.002 grs) and lengths were determined using a Mitutoyo ball micrometer and calipers.

I selected 20 random pieces of brass from a 100 count box just as they were delivered (ie. no prep on my part).

Neck diameter across two perpendicular sites:
     0.289 “ +/- 0.001

Neck Thickness across 4 quadrants of each neck:
     0.0139” +/- 0.0006
     (note: this is the average of 80
      individual neck measurements)         

Case Length:
     1.911” +/- 0.0005

Head Space (Hornady D comparator):
     1.530” +/- 0.0005

Dry Weight:
     448.060 grs +/- 0.248 
*note: dry weight reported represents dry weight of case while connected to a Century 21 pocket plug. To get true dry weigh subtract 279.4 gr.  (Edited 7/18/18).

Case Capacity:
     49.962 grs H2O +/-  0.268

WOW! The case capacity tolerance just blows me away.
These little jewels cost about a buck a piece but I won’t be culling a single one of them because of too much variation. They come individually packed in a case that can subsequently be used for reloaded rounds.
I could not be more pleased with these results. You done good Mr Bob @ Alpha. 👍

Re: Alpha Munitions Brass

Reply #1
that's impressive jerry... I may get a 100 for my 6 creedmoor
Grant

Re: Alpha Munitions Brass

Reply #2
I’ve analized a bunch of brass but none have come up as good as this batch of Alphas. I used to think Nosler had the best out there but not anymore.

Re: Alpha Munitions Brass

Reply #3
Can the average reloader measure case capacity or special tools needed?
Chris

Re: Alpha Munitions Brass

Reply #4
Glad you liked them.  It least it was worth the wait.
Have you received your H.H. barrel yet?



Re: Alpha Munitions Brass

Reply #6
Glad you liked them.  It least it was worth the wait.
Have you received your H.H. barrel yet?



Yes it came in. Very pleased with Josh’s work - chamber looks great thru the bore scope. Time for load development and I’m going to try several changes. No Bergers available so I’m going to have a wack at it with some 140 ELDMS, the Alpha brass and a little dash of R16.

Re: Alpha Munitions Brass

Reply #7
How does the Case Capacity compare to other brass? Is this data recorded somewhere on site other than here and there threads?
Thanks for the info, I just made an order.
As a young man they said your starting out in the machine shop as a Hambone. Here's a broom, scoop and wheel barrel. Those were some fun days.

Re: Alpha Munitions Brass

Reply #8
No, manufacturers do not typically publish this kind of data on their brass although I’m sure these are measurements that manufactures assess during production. A report like mine shows up here and there on forums. The accuracy of those private reports depends on the honesty of the reporter, the skill of the tester, and the accuracy of the testing equipment. Lot of variables there, that are further complicated by the fact that these measurements can vary from batch to batch out of the manufacture’s plant.

This particular batch of Alpha brass that I looked at this weekend is stellar in comparison to the batches of 6.5 Creedmoor Hornady, Norma, Prime (which is Norma), Nosler, Starline, and Peterson that I have evaluated in the past. I don’t know how it stacks up against Lapua 6.5 Creedmoor brass. However, If someone wants to send me 20 cases of Lapua, I would be happy to check them out. If they are better than this batch of Alpha brass I would be surprised.

Re: Alpha Munitions Brass

Reply #9
When I bought my 200 pieces Bob advised their brass has about 3.6% less capacity than the Hornady cases.  They make them a little thicker to last longer.  I reduce my powder amount by the same 3.6% stated within manuals.  I use RL26 with Fed GM 215 magnum primers and I am getting 2850 fps with the Berger 135 Hunter.  I haven't pushed it much beyond that but will see if I can hit 2900.

Re: Alpha Munitions Brass

Reply #10
Question for jvw2008, you mentioned the Alpha Brass dry case weight was     448.060 grs +/- 0.248  I'm confused.
For 6.5 creedmoor seems most cases run 170 grs or so, give or take 5 depending on who made them.  Add 5 more for primer if its included. Maybe I'm missing something simple here. Wouldn't be the first time. Thanks
As a young man they said your starting out in the machine shop as a Hambone. Here's a broom, scoop and wheel barrel. Those were some fun days.

Re: Alpha Munitions Brass

Reply #11
Sorry about that Hambone - that is confusing.
Take a look at the following link to see the neatest thing since sliced bread when it comes to measuring case capacity. 😊

http://www.xxicsi.com/primer-pocket-plugs.html

This little tool lets you use fresh cleaned brass with no primer in the pocket. It has a small O-ring around the nipple which seals the primer pocket allowing the case to be filled with H2O. Once the water weight is measured you simply pop the nipple out of the primer pocket and empty the case. The weight of the tool never changes so you can assay the weight variance from case to case. I put the dry case on the pocket plug and get the dry weight which I subtract from the water filled weight which gives you the case capacity number.

The weight of the pocket plug is around 279.4 gr. So if you subtract that from the dry weight I reported you end up with a dry weight floating around 170 grs. 😜

My apologies for not reporting the cause for the odd weight on that initial report.

Re: Alpha Munitions Brass

Reply #12
A friend gave me a box of of the SRP 6.5 CMs.  It was nice that they come in a ammo box, saved me the expense of buying one.  I too was impressed with the consistency.  I did however chose to turn the necks and did some inconsistencies there but I see it in all brass.  Not sure how much of a difference the larger flash hole is going to make.  Going into a new gun so load development will be from scratch.

Re: Alpha Munitions Brass

Reply #13
At $100 a box - that’s a damn fine friend!! 😊

Re: Alpha Munitions Brass

Reply #14
Jerry thanks for the clarification on the empty case weight, I knew it would be simple somehow. I ordered 200 Alpha brass and a hat, it came to about $225 or so.  So you have a good friend there Blinkster.
As a young man they said your starting out in the machine shop as a Hambone. Here's a broom, scoop and wheel barrel. Those were some fun days.