Murray Brook
Silver $$ Contributor
With my #'s Dave advised me to go with a .2725 neck. I don't shoot matches, just for my enjoyment and did not want to have to turn necks. Pointless for my needs.
BR case neck thickness?
- Thread starter RedfootRanch
- Start date
Shooter13
Gold $$ Contributor
Heck I'm moving away from turning necks I'm just going to skim cut! I do shoot competition too.
Since I have moved from bushings to expander mandrels to set neck interference, of the 5 most recent chamberings, the 6.5x284 is the only one I turn for and that is a skim targeted at 75%+. I intend on testing without turning for that that cartridge this summer to see the results at 1k and beyond.
Murray Brook
Silver $$ Contributor
I have heard this also and also heard from guys that have used it that they got very good case life. As for me I have yet to use this brass. I purchased a box for my next build because the Lapua is getting hard to find. I might also add that I have used Norma brass before in several other cartridges and found their brass to be of top quality.
rwj
Gold $$ Contributor
Grafs is the retail outlet for Peterson…
Thanks, @Hoot! I'll add these numbers to my list. The "LPT" prefix on your Lot # is only the 2nd occurrence with the other measuring in with largest thickness being .0145. Without more LPT prefix input, I'll treat that as a non-use outlier.
As an after thought, I am also curious what case heads on virgin brass mic to after reading a post some time ago regarding pressure signs on the OCD Alpha brass when it wouldn't grab the chamber as told by @Alex Wheeler in that post.
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I have picked up 100 pieces of Alpha and Peterson as well as I have 2 boxes of Lapua, from 2 sources with likely differing lots, inbound to measure and compare. Your inputs, combined with the my own measurements, will give me what I was after with this thread.
After having built a 20x47 Lapua, I have everything on hand to load for a 22 or 6mm in the x47. With a little necking down, I can now build virgin-case models in QuickLoad for output comparison.
Thank you for your responses!
After having built a 20x47 Lapua, I have everything on hand to load for a 22 or 6mm in the x47. With a little necking down, I can now build virgin-case models in QuickLoad for output comparison.
Thank you for your responses!
Ccrider
Gold $$ Contributor
So, why don’t you post the various thickness of the lots you have.
I also received 5 additional pieces of Lapua in the mail today that I borrowed from a friend to compare. Once I get the 2 boxes of Lapua in my hands, I will get all the measurements in one sitting. I will post up my findings including neck wall thickness, case base diameter and a few other measurements, as well as case capacity in grains of water for those who may be interested.
Here is what I have found with the brass I have/had on hand. A Hornady vernier ball micrometer was used to measure neck thickness. Having heard the Alpha brass was shorter in headspace than other brands, I chose to take a comparison measurement on the shoulder as close to the neck as possible. This was done by using a 28 cal bullet comparator and this is shown as "Other Length" in the pics. The samples of Alpha 6 BR brass have not arrived yet so I was unable to compare it to the BRA brass for measurements and capacity. After measurements were recorded I neck down the 10 pieces in each sample to 22 cal with a .274 bushing - maintaining the same 4 thou less than caliber that I found in the 6mm state. Between all the handling and drying, many of the markered 1-10 numbers became illegible so the positional 'numbering' for testing got mixed and doesn't correspond. Having heard Alpha primer pockets were tighter than other brass brands, I checked this as well.
Primer pockets were plugged with a 21st Century PP plug. All external measurements beyond neck thickness were down with a Mitutoyo digital caliper and weighing was done on an FX120. I used a set of (-) .001" pin gages to measure primer pockets.
Primer pockets were plugged with a 21st Century PP plug. All external measurements beyond neck thickness were down with a Mitutoyo digital caliper and weighing was done on an FX120. I used a set of (-) .001" pin gages to measure primer pockets.
Yes, I did this in one step.
When I built my 20x47L, I necked down ~.060 in 7 steps with bushings I had on hand. I still ended up with an average of .010+ of neck runout after running a .2031" expander mandrel through them prior to loading. The first 10 fire-forming shots went into a .389" group at 100 yds.
When I built my 20x47L, I necked down ~.060 in 7 steps with bushings I had on hand. I still ended up with an average of .010+ of neck runout after running a .2031" expander mandrel through them prior to loading. The first 10 fire-forming shots went into a .389" group at 100 yds.
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