10 mm handload.Was told it would blowup the gun.

[John Opitz]

Note: statements that I'm making about companies mentioned.I have no vested interest in said companies.
Tried the new accurate _#9 powder.
180 grain 10mm Hornady XTP/HAP bullet.
Using new starline brass.
Using 14.8 grains of accurate #9 powder.
Primers: federal gold medal large pistol primers #GM150M
C.O.L. @ 1.260"
Medium Crimping.
Maximum loading from handloading manuals 13.5 grains of accurate #9 Max.
Firearm used: STOCK Glock 20 gen.4
No feeding or extraction problems.
Unsupported chamber NO LESS.
Primers intact.
Pictures of cases enclosed.
Tightly cropped. 128kb limit.

[The_Shadow]

Yep!  #9 is a better powder today than years past.  AA#9 has had several formulation changes over the years.
The newest all flattened ball has better performance.

[John Opitz]

Here's a question for you or for anyone. I posted on Facebook about this.Facebook group about the 10 mm and I get things like.The gun is going to blow up. And their was another one that I'm blocked now. I can't post anything because I shouldn't have posted something like that. Because I can't quote it offhand, saying that I have to watch what posts I put up on the group. Some noob will really take you seriously and do damage to them. They also went to the extreme of calculating it, if it was possible to put that much powder in for a 180 grain bullet  I figured it was quick... something. The program. They said, the moderator said it was impossible to get that much powder  into the case.  I'm only increasing the powder from 13.5 to 14.8. That's what, with rounding errors. That's 9.6% increase. But I shot already 70 rounds of this stuff and I'm still here.  The Glock 20 I have which is a stock glock 20. Nothing's wrong with it. Was I  just lucky? Was my scale not calibrated right? Or did I just outright lie about the whole thing? But is it impossible to get that much powder in that case?

[John Opitz]

They're all rhetorical questions of course. By the way, I like how you do the tear Downs. I should say the pulldowns. As well as the other posters who participated in that.

[Kenk]

Yea, a guy has to be careful with their silly FB rules. A couple of years ago people were talking about rotating carry ammo. I mentioned that I mark them with a sharpie, once a rd has been cycled 2-3 times I just ?shootem up? which their algorithms took offense of and landed me in FB jail. Needless to say, I?ve limited my FB exposure dramatically.

[John Opitz]

Well good for you ! Showing them how it's done. I like how your analytical. I like how you do your posting. Sorry for the rhetoric, but you show them the meat and potatoes of this whole reloading approach. On Facebook reloading groups you see a lot of "how can I get the shiniest brass on my cases" attitude.

[Kenk]

Lol, I have learned a few things on some of the private groups, but mainly from this forum, and trial and error, heavy on the error : )

[RDub01]

14.8grs AA #9 has been one of my all time favorites.. Never had any issues..

Yea, just hang out over here, with those that actually know what they're talking about...

[John Opitz]

Well thank you! I give you an internet high five ! Thought I was the only one from the third planet from the sun, earth that put 14.8 grains of accurate number 9 powder into a starline case with a180 grain bullet. The way people we're talking seem like I lived on the planet Mercury where I had too much sun.
And yes, even though I don't post much. I do come by and look around, especially at those pull Downs.
I will stay in content and not do too much rhetoric.
Very impressed  with  not only how the glock is made but polymer handguns in general. Was mostly a revolver guy. Have the glock, polymer about a year or two. Impressed by the starline cases, were not bulged. The feeding and extraction of the cases, no problem. Primers were flattened but were intact, no leaking.  Not unusual for high velocity round, because on the 500 magnum I have. Used commercial rounds in the past and those primers will also flattened in the primer pockets.
Again, thanks for posting.

[sqlbullet]

Do you have chronograph data from testing your load?

As mentioned, #9 has been reformulated several times over the years.  The old data would suggest that 14.8 grains is a very compressed but safe load.  I always like the old #9 formula as it was practically impossible to get enough powder in the case to have an over-pressure.

Not sure if the "new" formulation is that different either.  The data on Hodgdon's website for a 180 grain XTP is the same data as Accurate has had for a very long time.  It is the exact data in my older copy of Modern Reloading 2nd Edition printed in 2007:  13.5 grains for 1242 fps.

That same manual lists 14.5(c) grains as a max load for a 180 grain FMJ.  It seems in recent loading data Hodgdon has dropped that load from their list of data.

[John Opitz]

Okay. powder I bought from Midway when they notified me that it came in it . Container it came in. Black lettering on a red background. And that was not too long ago. I would say within a month.
Those bad boys were clocking in at the low 1300s to mid 1300s as I remember.
On the 14.8, low to mid 1300s that is. No extreme variations in the readings But my main concern was looking at the cases for any bulges, splitting, any abnormalities. All cases tested and checked, none. How the glock was handling the rounds.
Handled fine. Don't even needed a heavier spring.Looking at the pockets any blown primers, any leakage from the primers pockets. No.,and  flattening of primers. Yes. However, still intact.
What I should have done was I should have taken a picture of the 13.5 case after and compared it to the 14.8 after .Next time I will exactly do that. Compare it with the 13.5. On the 14.8, like I said they were flattened but no leakage from the primers pockets and when I poped the primer it wasn't like the the primer was melted in the pocket.

Let me explain my workup. I started from 13.5 grams. Made 3 cartridges working up to 14.7 at .2 gr increments then what I call my topping off party. Make a  test 14.8.  I  also made 50 cartridges of 14.8 as my topping off party.
I checked all the cases in my test ones at every stage I did of the .2 gr. Increments work up. I caught at least two out of the three cases of each stage. As I have a brass catcher that doesn't catch every single case but about 95% I would say. Picking up cases from the ground ? No ! That's beneath  me .

[John Opitz]

Oh by the way thank you for your post because I was going to go up to 15 grains but I'll stop at 14.8

[John Opitz]

Rereading your  post again.
I'll do a 13.5 test again, a 14.5, and 14.8.
With pictures next time.

[sqlbullet]

That would be great to see your results.

Also interesting..Hornady 7th lists 14.9 grains as max for "180 grain bullets" which include XTP, HAP and FMJ.  They list velocity as 1250 fps.

Hodgdon website and the Lee manuals show pressures of under 35K psi with their 13.5@1242 load, indicating headroom for a little more.  I gotta wonder if they stopped testing at this charge and COAL because they didn't wanna compress the charge.  I know folks here (myself included) have had issues with compressed charges of #9 backing the bullet out unless you use a very heavy crimp.

Speer #13 doesn't have a 180 grain load with #9, but they do with a 200 grain FMJ:  14.0 grains for 1216 fps

Based on these added data points I would say your are fine at 14.8 grains.  But I would say that if you see much over 1300 fps you are getting real close to the edge of the pressure.

[sparkyv]

What is the face book?