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Old September 16th, 2018, 04:05 PM #11
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Quote:
Originally Posted by outrider58 View Post
As far as subs go, the primer is as important as the powder for consistent velocities.
can you elaborate?
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Old September 16th, 2018, 04:22 PM #12
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Quote:
Originally Posted by OLM-Medic View Post
can you elaborate?
Always better to use hotter primers for subs. Subs contain half the powder(more or less) than standard loadings. Often that powder is either lying flat in the cartridge or is shoved forward in the case as a result the cartridge being slammed into the chamber as in a semi-auto. All this causes space between primer initiation and contact with the powder.
Will your subs still go bang using standard primers? Yes, but the goal should be to gain the highest, most consistent velocities without stepping over the subsonic threshold occasionally.

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Old September 16th, 2018, 04:44 PM #13
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So, bench, magnum, or military primers are preferred.

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Old September 16th, 2018, 04:53 PM #14
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FWIW the 220gr RN pills I use for subs take up all the "air space" so even with 1/2 the charge the case is still full of powder. I use the same CCI 450 primers for super/sub BO as I do for .223.

Also FWIW, A1680 is the only sub powder that I found that would cycle my carbine gas system without the can.. From my testing the gas system, buffer spring and buffer are the most important items in sub cycling
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Old September 16th, 2018, 07:10 PM #15
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Quote:
Originally Posted by 85MikeTPI View Post
FWIW the 220gr RN pills I use for subs take up all the "air space" so even with 1/2 the charge the case is still full of powder. I use the same CCI 450 primers for super/sub BO as I do for .223.

Also FWIW, A1680 is the only sub powder that I found that would cycle my carbine gas system without the can.. From my testing the gas system, buffer spring and buffer are the most important items in sub cycling
CCI450s are magnum primers.

And basically the same as the military primers, except for the cup to anvil distance.
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