I bartered away some SPPs for some rifle powder I like, and was short on, but have almost a full case of small magnum pistol primers SMPP (SPPM?), but mostly reload 9mm, as we have 3 guns that use them...
How much should I back off my load when using SMPP?
Load data (Hogdon site) says 3.8 to 4.4 Universal for 124gr projectiles.
Lee Second edition has similar data for 100gr frangables (3.8 - 4.2gr Universal).
Assuming conservative lawyer data, as the max speed for 124gr lists 1045 FPS with 4.4gr on Hogdon,
Should I even back-off 4.0gr of universal with 124gr projectiles, if I use CCI Small Pistol Magnum Primers?
I have been using right-at the same data for 115gr FMJ, 124gr X-treme plated FP, and 124gr Acme 124gr RN with S&B/CCI SPP.
During the last shortage, I did test CCI #41 Hard Cup Small rifle primers in 9mm, and small pistol primers (various) in .223/5.56, w/out issue.
As I recall, #41's chrono'd about + 50-75 FPS in 9mm with the same charge.
The .223/5.56 I did not chrono, but they shot as well as I can shoot with iron-sights in a 1:8 20" AR.
Thoughts?
Please advise...
How much should I back off my load when using SMPP?
Load data (Hogdon site) says 3.8 to 4.4 Universal for 124gr projectiles.
Lee Second edition has similar data for 100gr frangables (3.8 - 4.2gr Universal).
Assuming conservative lawyer data, as the max speed for 124gr lists 1045 FPS with 4.4gr on Hogdon,
Should I even back-off 4.0gr of universal with 124gr projectiles, if I use CCI Small Pistol Magnum Primers?
I have been using right-at the same data for 115gr FMJ, 124gr X-treme plated FP, and 124gr Acme 124gr RN with S&B/CCI SPP.
During the last shortage, I did test CCI #41 Hard Cup Small rifle primers in 9mm, and small pistol primers (various) in .223/5.56, w/out issue.
As I recall, #41's chrono'd about + 50-75 FPS in 9mm with the same charge.
The .223/5.56 I did not chrono, but they shot as well as I can shoot with iron-sights in a 1:8 20" AR.
Thoughts?
Please advise...
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