My Full Power 10mm Load workup

I'm usually a big supporter of Nosler load data.... But everything they have for the 10mm doesn't add up to anything except maybe that their test barrel is a fluke.

Its a shorter, softer bullet than the XTP... Less bearing surface and all... The 13.2 grain Hornady load is safe with the XTP from what I've seen, from shooting, not reading... And its even safer with the Nosler bullet.

There is a pretty decent margin of safety with the 10mm using new brass and any decent chamber, OEM Glocks included...

I've pushed it as hard as it can be pushed with AA9 powder... Fact is, you can't get enough in the case, under any bullet, to get yourself into serious trouble... That's one reason I like it so much... It takes setback out of the picture.

And yes, QuickLoad is all but useless with straight walled rounds... Especially so with pistol rounds.
 
Last edited:
Isn't a CIP proof load 150% max operating pressure? If so, that is less than a proof load so likely wouldn't burst but yeah, that's a lot of pressure either way.

As for the pressures being WAY off, it's not that much IME. I usually compare my QL's to published data and most of the time they are not that far off. I haven't shot every one over a chronograph but they seem to track for the most part.

Anyway, it wasn't a criticism, just a point of interest.
 
@Ridgerunner665: I yield to your experience with the #9, I've not used it in the 10mm at all. I ran a pound through my Dad's 41 Magnum and didn't care for it so I bought another pound. I know, that was dumb, but it was on sale.

I know what you mean about some of the data out there too. Hornady is like that with their 460 Magnum data too. They only give it like 100 fps over the Casull which I can assure you is not the case. Lol.

I'll give the #9 a go in the 10mm, thanks.
 
got significant smiles on my brass at 8.4 grains of Longshot, but that was using XTP's instead of the Nosler bullets.
Click to expand...

I believe that. As I said the smiles started to show up with the nosler up near 9.2/3. The nosler bullet is a good bit shorter than the xtp.

Isn't a CIP proof load 150% max operating pressure? If so, that is less than a proof load so likely wouldn't burst but yeah, that's a lot of pressure either way.
Click to expand...

The chamber may handle it, but the case at 56k psi not so much.
 
Power Pistol is pretty much identical in performance, being within a tenth of a grain or so of Longshot at all levels in my testing.
Click to expand...

That's strange considering how much faster burning Power pistol is . Long shot is between AA 7 and AA 9...And slower than blue dot. Power pistol is faster burning than HS-6
 
Power pistol is faster burning than HS-6
Click to expand...

I know Hodgdon's burn rate chart has PP faster than HS-6. It's not. More proof of the absurdity of Hodgdon's burn rate chart. Accurate/Ramshot's chart has them the same rate; and that's much closer to the truth. Power Pistol is more energetic than HS-6; and makes bullets go a lot faster. Seems to be slower from my experience.

Be that as it may.

Stats Shooter:
Good post. Lots of useful info. You're pushing your 10mm harder than I care to. But that's just me. I don't see any need (for me) to take my 10's (20sf; 29sf) to the edge. They're a handful (for me) with 180's doing 1250 f/s. At any rate, I like seeing posts of load work ups. Perhaps in the future, you could also give is Standard Deviation data - important stat.
 
Perhaps in the future, you could also give is Standard Deviation data - important stat.
Click to expand...

It is improper to compare standard deviations of tests where the mean is increasing/decreasing. Also, I don't really have enough observations to calculate an actual SD in any one set with a confidence interval above about 80%. So, for the sake of not providing misleading info, I do not post Ad's on observations numbering less than 20 -25
 
Misleading? Improper?

Standard deviation is simply the average variance between each round as compared to the average for that range. 3 rounds is enough for a standard deviation. SD are as important as average, as it shows how consistent the round. You wouldn't give the SD for the entire set; rather, you give it for each individual load.
 
Standard deviation is simply the average variance between each round as compared to the average for that range. 3 rounds is enough for a standard deviation. you wouldn't give the SD for the entire set; rather, you give it for each individual load
Click to expand...

The standard deviation is the square root of the variance between each round.

3 observations suffers terribly from small sample bias. If one in 5 rounds is 75 feet per second above or below the mean, and the rest are within 5 fps, then depending on which 3/5 you shoot and record, you will have a widely different SD on only a 3 round set.

And the problem with posing SD's from different sets is, folks tend to compare them straight across.
I have a "sticky" im working on that explains all this for this forum. But, in a nutshell, the confidence interval for the mean and SD converges to 95% (or near it) around 25 obs (depending on variance). But, around 5 the confidence interval is more like 50%, which isn't something I would report.

Folks can do and say what they want, Im just explaining what I am comfortable reporting and why.
 
Stats_Shooter - Cool. I had always used the SD that came from my chronograph, but thought it was averaging out the difference between the average and each shot's difference from the average. Perhaps I'm thinking of average absolute deviation?
 
Cool. I had always used the SD that came from my chronograph, but thought it was averaging out the difference between the average and each shot's difference from the average. Perhaps I'm thinking of average absolute deviation?
Click to expand...

It is the average, of the sum, of the square, of the difference between each shot, and the mean. So your interpretation isn't that far off.
 
Yes. I did some research. The figure I used [manually] was the average absolute deviation, not standard deviation. From what I gather, it attempts to do the same - give a measurement of consistency or lack there of. Learn something everyday...if you're lucky.
 
It is improper to compare standard deviations of tests where the mean is increasing/decreasing. Also, I don't really have enough observations to calculate an actual SD in any one set with a confidence interval above about 80%. So, for the sake of not providing misleading info, I do not post Ad's on observations numbering less than 20 -25
Click to expand...

Fair enough.

I like seeing work ups - with or without SD stats. So it's all good.
 
Fair enough.

I like seeing work ups - with or without SD stats. So it's all good.
Click to expand...

Thanks,

I always post a high, and a low velocity, and an average (even though a mean also suffers by small sample bias, it's just not as significant and may change anyway with atmospheric conditions thus I consider it an approximation)

I will say that most rounds were within 5 fps of the average...and dropped from a Dillon 550 powder measure. It's one of the main reasons I chose not to use 800x.
 
You must log in or register to reply here.
Back
Top