Good to know.
223 Rem, 55 gr and H355, lets beat this again!
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tcoz
Member
I've used 24.2gr for thousands of loads. That one load in the Hornady manual has always puzzled me, being so low. I use their 55gr and 150gr FMJBT bullets almost exclusively (my range is only 100 yds) and for the other calibers that I load (300 BLK, 7.5x55 Swiss and .30-06 Garand), my loads are right in the ranges that Hornady gives so I've never been able to figure it out.
The Army has something incorrect??
I do not have the mental capacity to convert psi to cup as there is no direct conversion.
cheygriz
member
The above Army tech sheet lists rifle cartridge chamber pressure erroneously in psi. Mentally convert them to cup (copper units of pressure).
Bart, do you have a link to that information?
Bart, do you have a link to that information?
New member here...how y'all doing. Been lurking for some time and decided to take the plunge.
I noticed the same issue as the OP.
Some time ago, I started averaging the max load. I'll pick at least 3 data sources (one if which will always be the powder mfg). I try to use Lyman also. (H/T - Optimized Charge Weight)
I noticed the same issue as the OP.
Some time ago, I started averaging the max load. I'll pick at least 3 data sources (one if which will always be the powder mfg). I try to use Lyman also. (H/T - Optimized Charge Weight)
Page 10-7 lists for the pressure 52,000 PSI which seems correct per SAAMI
and military can be higher and not conform to SAAMI??
https://www.ar15.com/content/webPDF/TM43-0001-27.pdf
http://www.saami.org/specifications_and_information/specifications/Velocity_Pressure_CfR.pdf
and military can be higher and not conform to SAAMI??
https://www.ar15.com/content/webPDF/TM43-0001-27.pdf
http://www.saami.org/specifications_and_information/specifications/Velocity_Pressure_CfR.pdf
cheygriz
member
Rule3, I agree. SAAMI shows 55KPI.
I would find it hard to believe that such an obvious mistake confusing CUP with PSI would make it into an army TM and not get corrected almost immediately.
I would find it hard to believe that such an obvious mistake confusing CUP with PSI would make it into an army TM and not get corrected almost immediately.
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