Quote from: Reddog81 on December 08 2022 03:46:54 PM MST
14.8 Grains is probably pushing the limits for regular 10mm loads or more likely a bit over.   12.2 is a starting load and Hodgdon lists 30,800 PSI, while 13.5 is a max load and list 34,100 PSI.   That's an increase of 3,300 PSI for 1.3 grains of powder.  Your adding another 1.3 grains of powder which is adding at least another 3,300 PSI for a total of at least 37,400 PSI.  SAAMI max is 37,500.  However the more powder you add the less free space in the case so adding powder doesn't increase pressure in a linear manner.   

How much over 37,500 is the load is anyone guess.   It's not like a round running 37,500 PSI is safe and the gun can handle 100,000 rounds but then going up to 37,501 PSI is going to blow up the gun.   It's all just incremental wear and tear until the gun beats itself apart unless you do something really stupid.

Is it an unsafe load?   Probably not.   Your empirical evidence proves the isn't going to blow up.
Is it going to cause more wear and tear on the gun than a 13.5 grain load?  Yes.
Does this matter to you?

No. Because when I buy a handgun I buy it to use it. As far as for wear and tear. I use light loads or maximum loads or beyond that, and/or anything in between. Not only do I shoot the above load as noted, not all the time. That's what's good about hand loading. You can tailor the round to any application you want to use it for. If one was to shoot constantly the above listed round. You can go to a heavier spring. But my object was to see how a stock glock 20 would function with the above load without modifying it.
It's funny you say about wear and tear on handguns. Real quick. I have a former coworker that has a 1980"s or 80 Colt Python. He's not a gun guy. He just collects things. Example: Star War figures, Hot Wheels cars. Doesn't take them out of the wrapper which is called today blister packs. Colt python untouched by human hands. Literally. Nothing wrong with that.  The Colt python he has is untouched by human hands as far as for buying it from the ffl dealer to his possession. Today if you were fortunate enough by him that you can handle it. He literally has white cloth gloves for you to handle it. I told him why don't you shoot it. Even the light loads. I know he's not a gun guy. His reply was: I'll be putting wear and tear on the Colt Python. Well that's true.
His philosophy is different than mine. My Philosophy is. Use it, but don't abuse it.

I'll take that as a compliment.

https://m.facebook.com/story.php?story_fbid=pfbid02Nd6F2c55AzJrZUKnWi5YEyCVnVBytVm5o8xktpCwktrat4CVjy2VwgThAp2CQfWbl&id=100050382871199
The Facebook page where l have pictures of the cases.

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

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

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 .

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.

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.

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.

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?

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.

 my first post to the Forum. I was directed to this forum from a referral from Glock talk. Asking if there's any other Reloading Data for the 140 grain Lehigh XP bullet and the 150 gr. XD. I have the Reloading Data from Lehigh for a 140 grain bullet using Longshot starting load 7.7 gr., maximum 9.0 gr.
Using a Glock 20 10mm. I have longshot and accurate #9 powders on hand.