AverageJoeShooting Posted April 10, 2020 Share Posted April 10, 2020 Anyone have a starting load using AA7 and cci small rifle magnum primers for 38sc open? I've heard magnum primers add velocity, so I'm not sure if I want to start at my normal 10.4 grns Link to comment Share on other sites More sharing options...
BigBamBoo Posted April 10, 2020 Share Posted April 10, 2020 My load was 9.8 of AA7 with Starline brass, 124gr MG JHP’s, and Fed SRP. This load was interchangeable with my buddy’s .38SC rig. In fact we sometimes shared ammo at matches. My rig was a full length with no barrel holes. His was a full length rig with two holes in the barrel. Link to comment Share on other sites More sharing options...
AverageJoeShooting Posted April 10, 2020 Author Share Posted April 10, 2020 but were they magnum primers? Link to comment Share on other sites More sharing options...
36873687 Posted April 10, 2020 Share Posted April 10, 2020 From spp to srp I see 3 pf jump. Sorry never tested magnum Link to comment Share on other sites More sharing options...
ar15rick Posted April 10, 2020 Share Posted April 10, 2020 With my previous open gun pistol which was an STI built open gun with no popple holes I used 11.3gr of AA7 with 115 PD. Using small rifle primers loaded at 1.245 oal and i got 171 PF. I dont know what magnum primers will do. I have never used magnum primers. Sent from my SM-N960U using Tapatalk Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted April 10, 2020 Share Posted April 10, 2020 8 hours ago, AverageJoeShooting said: I'm not sure I want to start at my normal 10.4 grns You're correct. Back it off to 10 gr and work up, slowly, with chrono. Link to comment Share on other sites More sharing options...
zzt Posted April 11, 2020 Share Posted April 11, 2020 15 hours ago, Hi-Power Jack said: You're correct. Back it off to 10 gr and work up, slowly, with chrono. This ^^^^^^^. I do not understand the need for rifle, or worse, magnum rifle primers for 9mm or 38SC major. There is not a significant difference in primer brisance between SPPs. If you are getting flattening with one, go to a harder cup. CCI SPP have harder cups than most. If you are getting flattening and pressure signs with those, you don't go to rifle primers to 'cure' the problem. You adjust your load. Geez, with the powders available today you can reach major PF in 9mm as a STARTING load. With others you are within SAAMI +P pressures, or slightly above them. The OP is using AA7. That is not hard to light, and burns completely with a SPP. Link to comment Share on other sites More sharing options...
AverageJoeShooting Posted April 11, 2020 Author Share Posted April 11, 2020 4 hours ago, zzt said: This ^^^^^^^. I do not understand the need for rifle, or worse, magnum rifle primers for 9mm or 38SC major. There is not a significant difference in primer brisance between SPPs. If you are getting flattening with one, go to a harder cup. CCI SPP have harder cups than most. If you are getting flattening and pressure signs with those, you don't go to rifle primers to 'cure' the problem. You adjust your load. Geez, with the powders available today you can reach major PF in 9mm as a STARTING load. With others you are within SAAMI +P pressures, or slightly above them. The OP is using AA7. That is not hard to light, and burns completely with a SPP. Tbh I new to 38sc. People just said to use small rifle primers, so that's what I picked up. The magnum primers were an accident l, but I accidentally bought 9k magnum primers....so that's what I'm going to use. They wouldnt take them back so now I got a ton of them to use up Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted April 11, 2020 Share Posted April 11, 2020 5 hours ago, AverageJoeShooting said: I bought 9k magnum primers....so that's what I'm going to use. You won't see any significant difference. Link to comment Share on other sites More sharing options...
Acsr Posted April 12, 2020 Share Posted April 12, 2020 Im at 10.4 gr of aa7 oal of 1.225 124gr rmr for a 170 pf. Aa7 is a great powder very gassy, meters well and is consistent dirtier than 3n38 but never had it cause me a malfunction Link to comment Share on other sites More sharing options...
AverageJoeShooting Posted April 12, 2020 Author Share Posted April 12, 2020 2 hours ago, Hi-Power Jack said: You won't see any significant difference. no significant differance between regular small rifle and small rifle magnum primers? How could that be? Link to comment Share on other sites More sharing options...
AverageJoeShooting Posted April 12, 2020 Author Share Posted April 12, 2020 41 minutes ago, Acsr said: Im at 10.4 gr of aa7 oal of 1.225 124gr rmr for a 170 pf. Aa7 is a great powder very gassy, meters well and is consistent dirtier than 3n38 but never had it cause me a malfunction im using 10.4 grains of AA 7 with 124 grns but cci small rifle primers Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted April 12, 2020 Share Posted April 12, 2020 11 hours ago, AverageJoeShooting said: no significant differance between regular small rifle and small rifle magnum primers? How could that be? Be interested in seeing the results of YOUR testing. Let us know how large the difference in velocity is between regular and magnum primers - everything else being equal. I bet it is an insignificant difference. If not, I'll offer a full apology. Link to comment Share on other sites More sharing options...
AverageJoeShooting Posted April 12, 2020 Author Share Posted April 12, 2020 Lol I'm switching to loading them as soon as my powder comes in....which is taking forever cuz of this flu garbage Link to comment Share on other sites More sharing options...
zdali Posted April 13, 2020 Share Posted April 13, 2020 After being told to use small rifle primers for 9mm major, I've gone and done some testing. My conclusion is that here is _some_ merit to the theory, but not enough to care. Winchester primers showed the biggest change. 124gn Berrys RN, 7.0gn 3n37, stock CZ Czechmate, 10 shots, all chrono'd on the same day. PFs below CCI Small Pistol A:160 L:159 H:161 CCI Small RIfle A:161 L:157 H:162 Fiocchi Small Rifle A:158 L:154 H:160 Winchester Small Pistol A:157 L:152 H:160 Winchester Small Rifle A:161 L:160 H:166 Link to comment Share on other sites More sharing options...
AverageJoeShooting Posted April 13, 2020 Author Share Posted April 13, 2020 6 hours ago, zdali said: After being told to use small rifle primers for 9mm major, I've gone and done some testing. My conclusion is that here is _some_ merit to the theory, but not enough to care. Winchester primers showed the biggest change. 124gn Berrys RN, 7.0gn 3n37, stock CZ Czechmate, 10 shots, all chrono'd on the same day. PFs below CCI Small Pistol A:160 L:159 H:161 CCI Small RIfle A:161 L:157 H:162 Fiocchi Small Rifle A:158 L:154 H:160 Winchester Small Pistol A:157 L:152 H:160 Winchester Small Rifle A:161 L:160 H:166 have you done small rifle vs small rifle magnum? Link to comment Share on other sites More sharing options...
ParaGunner Posted April 13, 2020 Share Posted April 13, 2020 I use 10.8grns of AA7 at 1.23oal in 38sc, with 121grn bullets. My gun has 4 holes and comp if that helps. Link to comment Share on other sites More sharing options...
Aircooled6racer Posted April 13, 2020 Share Posted April 13, 2020 Hello: When I tested small pistol, small rifle, and small magnum pistol primers years ago. The magnum pistol primers where the hottest. They gave up to 35 feet per second more with the same powder drop than regular small pistol primers. As a side note cowboy shooters use magnum pistol primers with very low powder drops. Thanks, Eric Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted April 13, 2020 Share Posted April 13, 2020 2 hours ago, Aircooled6racer said: magnum primers gave up to 35 fps more Thanks, Aircooled .... That's up to 1% more velocity. Do you recall if it affected POI ? Link to comment Share on other sites More sharing options...
zzt Posted April 13, 2020 Share Posted April 13, 2020 52 minutes ago, Hi-Power Jack said: Do you recall if it affected POI ? When I tried that inadvertently, there was no difference in POI. I discovered it during a chrono session. I was wondering why the latest batch of rounds were faster than they should have been. It turns out CCI has accidentally put several sleeves of CCI 550 magnum primers in my case of CCI 500. I didn't get quite the increase A reports. My Limited load went from 172 PF to 175-6. Link to comment Share on other sites More sharing options...
AverageJoeShooting Posted April 13, 2020 Author Share Posted April 13, 2020 That's good to know. Now I need to find out if 115s and magnum primers are the way to the shooting gods heart Link to comment Share on other sites More sharing options...
AverageJoeShooting Posted April 13, 2020 Author Share Posted April 13, 2020 1449 1474 1504 1448 1495 1486 1474 1480 1488 1525 1482 1494 1489 1485 1524 1188 1539 1321 This is my load data for 10.4 grns of AA7 on a 124 grn bullet at 1.230 Not sure what's going on with the 1321 and 1188. I think the case was cracked or something Gun felt flat as hell tho Link to comment Share on other sites More sharing options...
safarihunter Posted April 14, 2020 Share Posted April 14, 2020 I tried magnum primers for a few months. Didn't see any benefit so went back to the standard sm pistol Link to comment Share on other sites More sharing options...
AverageJoeShooting Posted April 14, 2020 Author Share Posted April 14, 2020 2 minutes ago, safarihunter said: I tried magnum primers for a few months. Didn't see any benefit so went back to the standard sm pistol with 38sc? did they add velocity Link to comment Share on other sites More sharing options...
safarihunter Posted April 16, 2020 Share Posted April 16, 2020 My chronograph only showed 6-8 fps Link to comment Share on other sites More sharing options...
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