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I didn't want to hijack another thread so starting a new thread - https://www.thehighroad.org/index.php?threads/sort-9mm-by-headstamp.921531/#post-12682339
During the past decade, I kept reading posts from some members that R-P (Remington) headstamp brass have thinner walls. But in my testing and myth busting measurements where I checked neck tension by measurable/repeatable bullet setback feeding dummy rounds (no primer, no powder) from magazine, this was not the case as R-P/R-P "." brass tended to produce less bullet setback.
R-P brass having thinner walls may have been the case in decades past (And perhaps for 45ACP) but not for 9mm now.
All the 9mm cases I have measured in recent decade (Mostly once-fired brass I saw go from factory boxes to range floor, bright brass I collected from ground along with factory boxes at outdoor BLM shooting areas or bought from THR members as mostly "once-fired" range brass) at 4 positions around the case mouth (.100" below) and case neck (.200" below) at 12/3/6/9 O'clock have consistently and repeatedly showed R-P (And newer R-P ".") brass have thicker case wall on par with Starline/Winchester and I would not consider them to be "thinner" case wall brass.
In the "Myth Busting Neck Tension and Bullet Setback" thread, 12/3/6/9 O'clock measurements were made at .100" and .200" below case mouth.
And as you can see, .355" sized 115 gr plated RN bullet (Selected due to shorter bullet base compared to 124/147 gr RN bullets) loaded to 1.130" OAL that many reloaders may use in "real world" range blasting/plinking application, bullet setback measurements were summarized and averaged in below listing tested in Gen3 Glock 22/23 using KKM/Lone Wolf 40-9 conversion barrels - https://www.thehighroad.org/index.p...nd-bullet-setback.830072/page-3#post-10715550
CONCLUSION: This final post from "Myth Busting Neck Tension and Bullet Setback" thread demonstrated that R-P headstamp brass did not experience bullet setback with .354" sized Everglades 115 gr FMJ and .355" sized Hunting Shack Munitions 115 gr plated RN (Test continued with .3555" sized RMR 115 gr FMJ and .356" sized Zero 115 gr FMJ) all loaded to 1.130" OAL to once and for all, bust the myth that R-P 9mm brass has "thin" case wall - https://www.thehighroad.org/index.p...neck-tension-and-bullet-setback.830072/page-4
Additional verification.
When I tested the new Lee Pro 6000 for finished OAL consistency in progressive mode (shellplate full), R-P and R-P "." brass produced least amount of OAL variance, further confirming case wall thickness and brass alloy strength/quality - https://www.thehighroad.org/index.p...r-oal-consistency.911743/page-3#post-12446468
Further verification came when I tested 2023 Lee Pro 1000 for finished OAL consistency in progressive mode (shellplate full) and R-P and R-P "." brass produced .002" OAL variance with no bullet setback - https://www.thehighroad.org/index.p...pro-1000-unboxing.916672/page-2#post-12569726
Time to put this "myth" to rest, for 9mm brass.I sort R-P out due to their thinner case walls.RP gets sorted out and stored due to thinner wall thickness.
During the past decade, I kept reading posts from some members that R-P (Remington) headstamp brass have thinner walls. But in my testing and myth busting measurements where I checked neck tension by measurable/repeatable bullet setback feeding dummy rounds (no primer, no powder) from magazine, this was not the case as R-P/R-P "." brass tended to produce less bullet setback.
R-P brass having thinner walls may have been the case in decades past (And perhaps for 45ACP) but not for 9mm now.
All the 9mm cases I have measured in recent decade (Mostly once-fired brass I saw go from factory boxes to range floor, bright brass I collected from ground along with factory boxes at outdoor BLM shooting areas or bought from THR members as mostly "once-fired" range brass) at 4 positions around the case mouth (.100" below) and case neck (.200" below) at 12/3/6/9 O'clock have consistently and repeatedly showed R-P (And newer R-P ".") brass have thicker case wall on par with Starline/Winchester and I would not consider them to be "thinner" case wall brass.
In the "Myth Busting Neck Tension and Bullet Setback" thread, 12/3/6/9 O'clock measurements were made at .100" and .200" below case mouth.
Measurement #4 - Case Wall Thickness .100" below case mouth - https://www.thehighroad.org/index.p...nd-bullet-setback.830072/page-3#post-10712225
Measurement #5 - Case Wall Thickness .200" below case mouth - https://www.thehighroad.org/index.p...nd-bullet-setback.830072/page-3#post-10713822
All the measurements were summarized and averaged in this post - https://www.thehighroad.org/index.p...nd-bullet-setback.830072/page-3#post-10715550Average Case Wall Thickness .100" Below Case Mouth (Where taper crimp is applied):
.0129" - PPU
.0126" - S+B
.01256" - CBC
.0125" - HRTRS
.0124" - Tulammo
.0121" - GECO
.0120" - PERFECTA
.0119" - AGUILA
.0116" - R-P
.01158" - GFL
.0115" - PMC
.0111" - WIN
.0110" - Starline
.0108" - .FC.
.0105" - SPEER
.0104" - BLAZER
Average Case Wall Thickness .200" Below Case Mouth (Where most neck tension is applied to hold bullet ... Around Bullet Seating Depth for HSM 115 gr RN at 1.130" OAL):
.0144" - CBC
.0138" - PPU
.0137" - GECO
.0135" - HRTRS
.0135" - Tulammo
.0133" - S+B
.0132" - WIN
.0131" - GFL
.0130" - AGUILA
.0130" - PERFECTA
.01225" Starline
.0122" - PMC
.0121" - R-P
.0115" - .FC.
.0111" - SPEER
.0110" - BLAZER
But brass case wall thickness alone doesn't translate to neck tension as there are other factors such as malleability/ductility of brass alloy strength/quality and to me, proof of this in "real world" application is measuring and repeating bullet setback.And as you can see, .355" sized 115 gr plated RN bullet (Selected due to shorter bullet base compared to 124/147 gr RN bullets) loaded to 1.130" OAL that many reloaders may use in "real world" range blasting/plinking application, bullet setback measurements were summarized and averaged in below listing tested in Gen3 Glock 22/23 using KKM/Lone Wolf 40-9 conversion barrels - https://www.thehighroad.org/index.p...nd-bullet-setback.830072/page-3#post-10715550
Average Bullet Setback from Measurement #3 with Hunting Shack Munitions 115 gr plated RN at 1.130" OAL:
.0000" - GECO
.0000" - R-P
.0000" - WIN
.00008" - CBC
.00008" - Tulammo
.0001" - PERFECTA
.0003" - GFL
.0006" - PMC
.0008" - BLAZER
.0010" - .FC.
CONCLUSION: This final post from "Myth Busting Neck Tension and Bullet Setback" thread demonstrated that R-P headstamp brass did not experience bullet setback with .354" sized Everglades 115 gr FMJ and .355" sized Hunting Shack Munitions 115 gr plated RN (Test continued with .3555" sized RMR 115 gr FMJ and .356" sized Zero 115 gr FMJ) all loaded to 1.130" OAL to once and for all, bust the myth that R-P 9mm brass has "thin" case wall - https://www.thehighroad.org/index.p...neck-tension-and-bullet-setback.830072/page-4
Additional verification.
When I tested the new Lee Pro 6000 for finished OAL consistency in progressive mode (shellplate full), R-P and R-P "." brass produced least amount of OAL variance, further confirming case wall thickness and brass alloy strength/quality - https://www.thehighroad.org/index.p...r-oal-consistency.911743/page-3#post-12446468
- RMR 115 gr FMJ RN sized around .3555" were used
- Case mouth was flared to .380" at Station #5 (Used .750" length resized case to set the flare amount)
- .378" taper crimp was applied (Used .750" length resized case)
- Bullets were seated and taper crimped in same step at Station #6
- Blazer unsorted - OAL of 1.128"-1.133" (.005" variance)
- G.F.L. unsorted - OAL of 1.129"-1.133" (.004" variance)
- .FC. unsorted - OAL of 1.128"-1.131" (.003" variance)
- FC unsorted - OAL of 1.130"-1.132" (.002" variance)
- WIN unsorted - OAL of 1.131"-1.133" (.002" variance)
- R-P unsorted - OAL of 1.133"-1.134" (.001" variance)
- R-P "." unsorted - OAL of 1.134"-1.135" (.001" variance)
Further verification came when I tested 2023 Lee Pro 1000 for finished OAL consistency in progressive mode (shellplate full) and R-P and R-P "." brass produced .002" OAL variance with no bullet setback - https://www.thehighroad.org/index.p...pro-1000-unboxing.916672/page-2#post-12569726
- Blazer unsorted - OAL of 1.128"-1.131 (.003" variance)
- FC unsorted - OAL of 1.129"-1.132" (.003" variance)
- .FC. unsorted - OAL of 1.129"-1.131" (.002" variance)
- R-P unsorted - OAL of 1.132"-1.134" (.002" variance)
- R-P "." unsorted - OAL of 1.133"-1.135" (.002" variance)
- WIN unsorted - OAL of 1.133" (.000" variance)
- Blazer - 1.128" - 1.126" - .002"
- Blazer - 1.128" - 1.125" - .003"
- FC - 1.131" - 1.131" - .000"
- FC - 1.131" - 1.131" - .000"
- WIN - 1.133" - 1.133" - .000"
- WIN - 1.133" - 1.133" - .000"
- R-P - 1.134" - 1.134" - .000"
- R-P - 1.134" - 1.134" - .000"
- R-P "." - 1.134" - 1.134" - .000"
- R-P "." - 1.134" - 1.134" - .000"
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