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Discussion Starter #1
New to the 10MM new to Glock and started loading for it after collecting some brass. I worked up to and with; 180gr cast hard coated bullets with CCI LP 300's and 7.8gr of Power Pistol 1.265 coal (Per Hornady book and Lyman cast bullet book) 1180 fps (below book fps) and ringing a 10" gong at 50 yards, safe and all's good.
After reading a few post and deeper in the the books, I got my hands on some Accurate #9 and some CCI LP Magnum primers, after working up by the Hornady book with Star line brass, LP 350 mag primers, 13.8gr of Acc#9 and 180gr Hornady XTP-HP. The book says 1150 fps with 5" barrel, this 6" GL40 is pushing over 1300 fps,, I'm I missing something ?,, Primers are a little flat but still round edges, no more bulge than light factory ammo. Striker impact is hard to tell about with the squared point???

Date:12/6/19Glock 40 - 6" Barrle
Star line brass x1 fired - CCI LP Magnum primer - 180gr Hornady XTP HP - 1.265 COAL - 3/4 turn LF crimp
Accurate #9 Powder13.2gr13.7gr13.8gr*14.0gr
String:1243
Grains:180180180180
Hi Vel:1251130713161342
Low Vel:1230129713031328
Ave Vel:1238130113081336
Ext Spread:21101314
Std Dev:11577
Velocity1251129713031328
Velocity1234130013051342
Velocity1230130713161340
Power Factor225233234239
 

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10mm-firearms.com and GlockTalk.com have great info on Glock/10mm/reloading. I shoot a G20 stock.

165 and 180 w/ No. 9 and std. primers. No lead. Good luck.
 

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My 4" G20 load is a 180 XTP at just over 1200 fps using 13gr of AA#9 powder

The velocity in load manuals may or may not actually match real life, that's why it's good to check a couple sources.
 

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If I were to load I would consider blue dot 180 or 200 gr constrol exp bullet. I have found I can buy double tap ammo when they run good sales cheaper than I can reload or as cheap. I have killed lots of deer with thier 200gr control EXP bullet. Fired from GLock 20 Glock40 and long slide 1911s. I have taken deer out as far as 80yds and 10-12 at 50yds and I dont even know how many under 50yds. All one shot DRT.
 

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With GLocks you can get burn through at firing pin strike to with high pressure. Because Glocks strike so hard. Watch for excessive swell at base of case. You will find your cases dont last long.
 

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Discussion Starter #6
Hornady 9th edition list 180gr XTP and Accruate#9 at 14.9gr Max with 1250 fps..
On-line Western powders data list 180gr XTP and Accrate#9 at 13.5Max with 1242fps
I have other loading manuals that don't even list this combination.
I'm glad the G40 is tough, at 14.0 grs and 1300 plus fps it was letting me know it. that is why I asked here; Am I was missing something.
I hope Hornady looks in to this????
I did do some lower charged cci300 vs cci350 magnum primer fps test using AA9 and power pistol with 20/25 fps difference
I will starting over using the magnum primers and AA9 working up again, I do think the #9 is the way to go with 10mm... It is so fine that it gets packed in the tricking shaft of my work up trickle and makes it hard to turn...
I still did not see pressure signs on the brass or primers at 13.8gr ?? kinda bothers me..
 

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Discussion Starter #9
Buffalo Bore has a 180g load that is around your velocity with one inch less barrel, https://www.buffalobore.com/index.php?l=product_detail&p=114
Yes Sir. and I bet that's a hot wear and tear MoFo on a pistol to..
I really wasn't looking to run that hot, I was going by the load data in the book expecting to be around book values; hoping for a little more speed with the longer barrel but not off the chart.
I wish we knew the true pressures of that load and not just a computer guess'tament..
It was banging the heck out of a ten inch gong at 50 yards to almost doing flips..
 

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Yes Sir. and I bet that's a hot wear and tear MoFo on a pistol to..
I really wasn't looking to run that hot, I was going by the load data in the book expecting to be around book values; hoping for a little more speed with the longer barrel but not off the chart.
I wish we knew the true pressures of that load and not just a computer guess'tament..
It was banging the heck out of a ten inch gong at 50 yards to almost doing flips..
Yes its a full power load but still within pressure limits. Their are no +p loads for the 10mm, its already at +p pressures. The 10mm is a modern round and was designed around the full pressure loads and all pistols are built to handle that. The 2017 Alliant Powder loading guide shows a load of Blue Dot 11.0 grains and velocity of 1295. Also theirs a paragraph in the Buffalo Bore link that pertains to Glocks that may be of interest to you.
 

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11gr of Blue Dot works very well with 180gr FMJ. The primers are flat but not cratered. This load is what the 10mm is all about! I picked up a Mech Tech 16" carbine upper for a Glock 20 and it's awesome with this load. I'll chrono soon and see what it's running.

Edit for Chrono results: 1475fps avg
 

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Good info.

I plan to start HL for my G-40. Took a deer with it this year. It was a VERY WORTH WHILE purchase.
 
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