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Messages - jvw2008
Take a look at the following link to see the neatest thing since sliced bread when it comes to measuring case capacity. 😊
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.
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.
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.
Can the average reloader measure case capacity or special tools needed?
There are several other videos you can look at but this one will get you started.
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)
1.911” +/- 0.0005
Head Space (Hornady D comparator):
1.530” +/- 0.0005
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).
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. 👍
Sounds like his COAL was 2.715" to lands. Not his base to ogive.
Yes I agree, it sounds like it. But it’s not clear so I’m looking for a definitive answer.
Just stick with one or the other and work up a great load and be happy with it.