10mm LOAD DATA from over the years...

[The_Shadow]

RDub01, Thank you for the added data and glad to see some pressure values with those also.

[Alabusa]

Hornady data is all I use for 10mm. The rest are watered down, spicy 40S&W loads.

Sent from my SM-G986U using Tapatalk

[sqlbullet]

Over the last few weeks I have compiled all the data in this thread into a spreadsheet, along with some newer data sourced from the interwebs.  I wanted it in one place so I could do some data analysis on the information, and then put up a WIKI page with access to the raw data as well as various analysis.  I started the analysis the last couple of days and thought I might share a preview.

If you want a general purpose 10mm powder with lots of data, AA#7 is tops with a total of 73 loads across 17 bullet weights.  Next is AA#5 with 64 loads over 15 bullet weights, then Unique with 55 loads over 12 bullet weights.  The top 10:

|______Powder_____	|___Loads___	|___Weights___|
AA7	73	17
AA5	64	15
Unique	55	12
Blue Dot	49	11
W231	49	11
AA9	47	14
Power Pistol	45	12
HS6	43	10
800X	38	9
Silhouette	27	11
N340	25	6

Note that 800X is no longer available, so I included the 11th spot as well.  Also, rumor is that Silhouette is the same as WAP which might give it a bit higher ranking (or not if all the WAP data is already duplicated as Silhouette).

I ranked each load by speed in a given bullet weight.  Then I checked counts of powder that were consistently in the top 3 spots.  No surprise really that AA#9 was in the top 3 for speed over 13 bullet weights.  AA#7 was second with 11 top three spots.  Blue Dot, Power Pistol and Silhouetted (WAP) tied for third, each with 4 top three spots.

Staying on the speed demon train, the top performing powder by bullet weight:

|___Bullet Weight___	|___Powder_____	|___Max Velocity___|
100	800X	1,665
100	AA7	1,650
115	AA7	1,540
125	Power Pistol	1,520
135	Silhouette	1,575
140	Power Pistol	1,391
145	AA9	1,422
155	Blue Dot	1,450
165	BE-86	1,344
170	AA9	1,340
175	BE-86	1,301
180	Blue Dot	1,295
185	AA9	1,248
190	AA9	1,267
195	AA9	1,193
200	SP2	1,232
205	AA9	1,157

I put 100 grain in twice as 800X is no longer available.

I also, just for fun, ran a pivot on pressure by data source.  Gives a peak into the risk profiles they applied to the ballistics testing.  This view of the data makes it clear why Accurate powders top the velocity charts so often - they publish data that is closer to max pressure:

|___Source_____________	|___AVG Max Pressure_____	|___SafetyMargin_____	|___MAX Pressure___|
Accurate Arms	35,208	6%	37,500
Western Powders 8.0	35,206	6%	37,500
ADI Powders	35,100	6%	36,900
Hodgdon (Web V1)	34,865	7%	36,900
Alliant Print	34,691	7%	36,000
Shooter World Online	34,635	8%	37,415
Hodgdon #26	33,981	9%	36,900
Winchester	33,938	9%	35,700
IMR	33,829	10%	35,800
Western Powders	33,729	10%	35,700
Lovex	33,250	11%	33,600
Lyman #51	31,344	16%	37,500
Lyman #50	29,149	22%	37,500
Lyman Cast Bullet 4th	28,800	23%	29,900
Lyman	28,772	23%	30,000

If I exclude the cast bullet handbook data, which is generally not loaded to max pressures, the average safety margin across all publishers comes in at 10%, not weighted by number of loads. Lyman in general is pretty risk averse - If you removed them the average is 8% safety margin.

For those that frequently opine that data is driven by attorneys, please remember that a 20° F temperature increase in the ammunition works out to an average of a 5% increase in pressure.  Considering that variable in conjunction with factors like bullet seating depth, set back, primer variations, case capacity differences and manufaturing tolerances in firearm chambers and an 8% margin starts to seem prudent.

I will update this thread again with a link once I complete the Wiki page.

[The_Shadow]

Nice computation of things across powders and bullet weights.
My concerns are with Accurate #9 powder.  Over the years there have been several variations of the formulations.

My first canister of AA#9 was the microbead which was said to be WC820


Later they had mixture of WC820 80% and WC350 10%


Next was WC820 80% and Accurate #7 20%


This is the newest formulation 100% flattened ball which we see today as a total reformulation.


This newest formula of Accurate #9 seems to be the best with the homogeneous formulation of all of the older ones that were blended mixes...

[sqlbullet]

AA#9 is a great example of delta over time.  800X also had this - the flakes were the same size but the load data changed....Did the formulation change or was the older data just "hot".

I am chasing down dates for the data specifically so I can track changes by publisher over time.

[10 Round]

Nice work up. I would like to see it in a printable version.

[sqlbullet]

Once I complete the WIKI page it will include a downloadable file.

[John A.]

Having a downloadable file at wiki would be great.

IF

someone didn't come along later and delete it.

That's the bad thing with wikipedia.  Anyone that creates an account there can add or delete at will.

I do believe that there is a way that the administrators there can lock pages.  or certain parts of pages to prevent editing.  But, I don't know what that process involves.

[sqlbullet]

Not Wikipedia...Our wiki that I admin 

[John A.]

Ok, sorry.  I thought you were referring to something else.