TwoShot Posted March 29, 2008 Share Posted March 29, 2008 This was my first experience loading major for anything other than a .45 acp. I thought I would share the results. I was pleased to see the velocity went up in a linear fashion. The 7.3 grain load showed some flattening of the primer, but I believe it is acceptable. STI Trubor 9 mm Powder - Ramshot Silhouette Bullet Montana Gold 124 CMJ RP once fired brass Primer Winchester SR Sized with a Lee "U" die OAL - 1.15 Slight taper crimp with Lee FCD Outside temp 50 degrees Sample size 8 rounds each Press - Hornady Projector Powder wt. 6.5 Gr. Hi-Lo, 1217-1230 fps ES-13, Sd-5 Ave Velocity - 1222 PF - 151.5 Powder wt. 6.7 Gr. Hi-Lo, 1245-1257 fps ES-12, Sd-5 Ave Velocity - 1252 PF - 155.2 Powder wt. 6.9 Gr. Hi-Lo, 1274-1288 fps ES-14, Sd-5 Ave Velocity - 1280 PF - 158.7 Powder wt. 7.1 Gr. Hi-Lo, 1301-1320 fps ES-19, Sd-8 Ave Velocity - 1310 PF - 162.4 Powder wt. 7.3 Gr. Hi-Lo, 1334-1349 fps ES-15, Sd-6 Ave Velocity - 1342 PF - 166.4 Link to comment Share on other sites More sharing options...
ipscbob Posted March 29, 2008 Share Posted March 29, 2008 Can you post a pic of the flattening on the primers for the 7.3 load? I would be wary of a load that is starting to flatten primers at 50F. What happens to the pressure in the summer? Link to comment Share on other sites More sharing options...
TwoShot Posted March 30, 2008 Author Share Posted March 30, 2008 Can you post a pic of the flattening on the primers for the 7.3 load? I would be wary of a load that is starting to flatten primers at 50F. What happens to the pressure in the summer? I don't have a digital camera. The primers show less flattening than primers from CCI police ammo. That is what I was comparing to. I will have them checked out by a gunsmith who will be at the match in two weeks. Thanks for the concern, I will get advice from one more knowledgeable than me before moving on. Link to comment Share on other sites More sharing options...
HSMITH Posted March 30, 2008 Share Posted March 30, 2008 Sounds like the throat in the barrel is really short. I have been into the mid 190's power factor with Silhouette and didn't see any flattening on rifle primers. This is also the reason I do load development with Federal small pistol primers, they show pressure and will be FLAT before a WSR primer gets anywhere close to flat. It just dials the sensitivity up a little when primers are about all we have to gauge pressure, primers are a very poor method of gauging pressure so I want all the sensitivity I can get. Silhouette is a great 9mm major powder, by price it is my favorite and second choice if price is not a factor, good stuff for sure. Link to comment Share on other sites More sharing options...
ipscbob Posted March 30, 2008 Share Posted March 30, 2008 Sounds like the throat in the barrel is really short. I have been into the mid 190's power factor with Silhouette and didn't see any flattening on rifle primers. Yup....Sounds similiar to my experience with 38super and silhouette. I load supercomp cases, silhouette, 124gr MG JHPS, and win primers to 175+pf and see NO pressure signs so this seemed to be a red flag to be checked out. Link to comment Share on other sites More sharing options...
TwoShot Posted May 15, 2008 Author Share Posted May 15, 2008 From my first post you can see I was making major at 7.3 grains of Silhouette. Those were the first rounds fired through a new gun. I bumped the powder to 7.4 and loaded 500 rounds. Somewhere around 450 rounds fired I chronographed again. To my surprise velocity was 1285 to 1295. I just loaded some more with 7.5, average velocity is 1305 to 1310. I have loaded for 20 years and for many guns, this major 9 stuff is frustrating. Any ideas on why these loads are slowing down. Nothing else was changed and I rechecked the powder charge by random samples. Link to comment Share on other sites More sharing options...
TMC Posted May 15, 2008 Share Posted May 15, 2008 I use 8.0 with Winchester small pistol primers with no pressure signs. Link to comment Share on other sites More sharing options...
dr2e Posted May 15, 2008 Share Posted May 15, 2008 (edited) i have been doing some load testing and i am using: 7.65 silhoutte 124gn montana gold cmj fired winchester brass wsr primers 1.166 - 1.170 oal tested on 3 different cronos with consistent readings with a >10 sd on all(which surprised the heck out of me after checking some dillon thrown loads !) no signs of flattening primers and an average 172 pf. 5" kkm barrel w/marvel comp nice dot recovery too! Edited May 15, 2008 by dr2e Link to comment Share on other sites More sharing options...
HoMiE Posted May 15, 2008 Share Posted May 15, 2008 Here is my load out of SV IMM 4.5" open gun, Speer once-fired, Fed SP, 1.175" OAL, MG 124 JHPs Silhoutte 7.8gr HI 1388.4 fps LO 1361.7 fps SD 11.1 ES 26.7 AVG 1369.6 fps PF 169.8 Link to comment Share on other sites More sharing options...
TMC Posted May 15, 2008 Share Posted May 15, 2008 I use 8.0 with Winchester small pistol primers with no pressure signs. I should add my gun is a 4 port hybrid, hence the 8 grain load. Link to comment Share on other sites More sharing options...
lcs Posted May 15, 2008 Share Posted May 15, 2008 TwoShot, According to your first post, your OAL is to short (1.150). If you are using mags with spacers for 9Major, then you can go to 1.174. If using SVI mags without spacers you can go to 1.185 easy, but not really need for 124gn bullets. With a 124 CMJ the OAL of the bullet is longer and seats deeper in the case than a JHP for example. I have thousands of 9 Major shot with silhouette and have used 115JHP, 121IFP, and currently use 125JHP Zeros loaded with 7.7, WIN brass w/WSR primers for 171PF and have not seen any signs of pressure. Link to comment Share on other sites More sharing options...
JThompson Posted May 15, 2008 Share Posted May 15, 2008 (edited) TwoShot,According to your first post, your OAL is to short (1.150). If you are using mags with spacers for 9Major, then you can go to 1.174. If using SVI mags without spacers you can go to 1.185 easy, but not really need for 124gn bullets. With a 124 CMJ the OAL of the bullet is longer and seats deeper in the case than a JHP for example. I have thousands of 9 Major shot with silhouette and have used 115JHP, 121IFP, and currently use 125JHP Zeros loaded with 7.7, WIN brass w/WSR primers for 171PF and have not seen any signs of pressure. 2 I was at 8.3 with OAL at about 1.163-5 PF 172 Primers were just starting to show pressure, but nothing to bad. EDIT 115gr bullet Edited May 17, 2008 by JThompson Link to comment Share on other sites More sharing options...
stockton Posted May 16, 2008 Share Posted May 16, 2008 ... your OAL is to short [... +100!!! 1.500 is waaaaaaaay short for 9 major. Go to AT LEAST 1.175. I am using a Schuemann Hybri-Comp 5.5 inch barrel and Bedell Ti comp with 3 tapered (.125 into bore, .1875 at top of barrel rib) poppleholes. 7.7grs. of Silouette pushing a 124gr MG JHP loaded to 1.175 OAL with WSR primers makes 167.4 PF in 75 degree weather with NO signs of pressure. Same load with WSP primers also shows no pressure signs and I have pulled primers to check and their walls still look nice with a bevel around the edge of the striking flat (that edge squares pretty early with pressure). Link to comment Share on other sites More sharing options...
matt2ace Posted June 2, 2008 Share Posted June 2, 2008 7.8 gr Silhouette 124gr CMJ (MGD) 1.162" OAL WSP or WSPM primers (mostly WSPM) STI (very) shorty I get similar results as posted by other user's here. ~170PF and very low SD (4-8 with same headstamp, 5-10 with mixed headstamps). No signs of pressure issues with either WSP or WSPM (magnum primers are supposed to have higher pressures) Link to comment Share on other sites More sharing options...
JimInFL Posted June 2, 2008 Share Posted June 2, 2008 (edited) Although I'm pretty new to this, I just happen to chrono mine a day or two ago, so I'll share. 7.7 gr Silhouette 125 gr Zero JHP 1.162 OAL -and- Same using True Blue. Averages between 171.5 and 172.5 PF, with the TB the higher of the two. This is in a Jim Anglin full size gun. I kind of like the 'feel' of the TB a bit better, although, like I said, I'm still pretty green to this. No pressure signs that I can identify. (edited to add - Winchester small rifle primers) JimInFL Edited June 2, 2008 by JimInFL Link to comment Share on other sites More sharing options...
Harmon Posted June 13, 2008 Share Posted June 13, 2008 i ran 30000 rounds of 9mm major with 3n37 loaded shorter than 1.150 without any pressure problems. tried silhouette, it was ok, but not better than 7625 IMO Harmon Link to comment Share on other sites More sharing options...
smokshwn Posted June 13, 2008 Share Posted June 13, 2008 +1 on 1.15 being on the short side for 9major. I am running 1.17 ish WSP primers and my charge weight is right at 7.8 for 124 gr bullets with zero pressure signs Although I'm pretty new to this, I just happen to chrono mine a day or two ago, so I'll share.7.7 gr Silhouette 125 gr Zero JHP 1.162 OAL -and- Same using True Blue. Averages between 171.5 and 172.5 PF, with the TB the higher of the two. This is in a Jim Anglin full size gun. I kind of like the 'feel' of the TB a bit better, although, like I said, I'm still pretty green to this. No pressure signs that I can identify. (edited to add - Winchester small rifle primers) JimInFL Jim, just wanted to give you a heads up on the TB. My experience was that it was a very good feeling powder however I went from very slight primer flattening at 7.8 to tophatted smashed primers at 8.0 so I think there is a pressure spike right in that neighborhood. YMMV Link to comment Share on other sites More sharing options...
JimInFL Posted June 24, 2008 Share Posted June 24, 2008 +1 on 1.15 being on the short side for 9major. I am running 1.17 ish WSP primers and my charge weight is right at 7.8 for 124 gr bullets with zero pressure signs Although I'm pretty new to this, I just happen to chrono mine a day or two ago, so I'll share.7.7 gr Silhouette 125 gr Zero JHP 1.162 OAL -and- Same using True Blue. Averages between 171.5 and 172.5 PF, with the TB the higher of the two. This is in a Jim Anglin full size gun. I kind of like the 'feel' of the TB a bit better, although, like I said, I'm still pretty green to this. No pressure signs that I can identify. (edited to add - Winchester small rifle primers) JimInFL Jim, just wanted to give you a heads up on the TB. My experience was that it was a very good feeling powder however I went from very slight primer flattening at 7.8 to tophatted smashed primers at 8.0 so I think there is a pressure spike right in that neighborhood. YMMV Thanks smokshwn - did you need to go higher on the load for a reason, or were you experimenting ? Link to comment Share on other sites More sharing options...
Joe4d Posted June 24, 2008 Share Posted June 24, 2008 I say increase OAL and start over assuming your bore will take longer OAL, Second are you leaving the powder in the measure ? was the 7.3 load from a freshly opened powder jar and the 7.5 is from powder that's been open for awhile or left in a powder hopper gaining moisture ? dunno if that would account for .2 gs or not but just a thought. Link to comment Share on other sites More sharing options...
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