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Old 12-24-2011, 12:39   #1
gofastman
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AutoComp and light bullets in 10mm

anyone have experience with this powder for 10mm?
I use (and LOVE) Longshot for most 10mm loads, but I picked up some autocomp for .380.
I have read that longshot isnt the best velocity wise for lighter bullets like 155gr and under.

i know visual appearance can be very deceiving and more or less useless in identifying various powders, but AutoComp looks exactly like Longshot, only AC has slightly smaller grains.
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Old 12-25-2011, 00:20   #2
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Why Autocomp?

Autocomp is designed for major powerfactor loads in "automatic" "compensated" race guns...

For .380 auto use HP-38.... I just chronoed today a new Bear Creek 95g moly RN load. 3.1g at .980 OAL averaged 765 fps out of my Keltec P3AT.
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Old 12-25-2011, 15:40   #3
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anyone?
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Old 12-25-2011, 16:59   #4
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You should try this out over in the 10ring section of glocktalk. Maybe someone there has tried this powder in 10mm.
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Old 12-26-2011, 00:10   #5
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Quote:
Why Autocomp?

Autocomp is designed for major powerfactor loads in "automatic" "compensated" race guns...

For .380 auto use HP-38.... I just chronoed today a new Bear Creek 95g moly RN load. 3.1g at .980 OAL averaged 765 fps out of my Keltec P3AT.
Well, its a slower burning powder, actually its very slow for .380.
it should be very forgiving in the pressure department when working up a max load, my goal is a 90gr XTP @1200fps from a non-pocket gun barrel

but... back on topic...
IIRC, the late SwampFox said he uses AutoComp in his 155gr XTP loads, but that was a while back. last i checked, he used Longshot exclusively in 10mm but adjusted the OAL and primer type for light bullets, I dont have the pressure testing equipment he does so i dont want to do that.
Its really a bummer he passed, that guy was a real asset to the 10mm community (and seemed to be an all around nice guy)
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Old 12-26-2011, 01:15   #6
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I use mostly Power Pistol, Blue Dot, and Longshot for all my warm to hot 10mm loads. I also only load my own lead loads so I can't be of much help to you. FWIW, I just finished working up some loads for a lee 145 grain lead SWC and found that Power Pistol gave me the tightest groups overall. Probably the tightest groups i have shot from my lead loads for any caliber. The Hodgdon site has lots of info for Autocomp in the weight range that you mention and the FPS seems pretty stout. Not sure what your goal is but I'm sure you can work up a killer load with that powder. I've only been loading for less than a year now so take anything I say worth a grain of salt... I have been wanting to pick up a pound of 800x to try out in some hot 10mm loads, and your mention of autocomp may prompt me to pick up a pound of it as well. Good luck and let us know how it works out.

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Old 12-26-2011, 08:31   #7
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Old 12-26-2011, 10:46   #8
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Not sure what your goal is but I'm sure you can work up a killer load with that powder.
my goal?
to start:
155gr xtp @ 1400fps
the plan:
9grs Autocomp
CCI 350
1.255 OAL

Eventually id like to get some
155gr xtp's up to 1500fps
and some 135gr Noslers up 1700
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Old 12-26-2011, 11:46   #9
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Gofastman, I'll be interested in what you can obtain data wise...
Have you read thru the 10mm Reloading section here on GlockTalk?
http://glocktalk.com/forums/forumdisplay.php?f=67

Lots of data to study thru...might help your project!
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Old 12-26-2011, 12:01   #10
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I've been loading Autocomp with 180gr FP Bear Creek bullets with decent results. But it's pretty dirty with all powder levels I've tried. You get a big puff of black smoke with every shot. I'm planning on trying a faster powder to see if it burns cleaner. It's still accurate but Autocomp burns much cleaner in .40 & .45acp.

Last edited by Reboot; 12-26-2011 at 12:02.. Reason: stupid autocorrect
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Old 12-26-2011, 13:24   #11
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Quote:
Originally Posted by Reboot View Post
I've been loading Autocomp with 180gr FP Bear Creek bullets with decent results. But it's pretty dirty with all powder levels I've tried. You get a big puff of black smoke with every shot. I'm planning on trying a faster powder to see if it burns cleaner. It's still accurate but Autocomp burns much cleaner in .40 & .45acp.
The smoke might be from the powder, but it's more likely caused by the moly/lead BC bullets. I'll bet if you loaded MG or Zero JHP's with it, the smoke would disappear. Autocomp should be a decent powder for 10mm, but I'll stay with 180's/200's & Longshot.
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Old 12-26-2011, 15:02   #12
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Originally Posted by Reboot View Post
I've been loading Autocomp with 180gr FP Bear Creek bullets with decent results. But it's pretty dirty with all powder levels I've tried. You get a big puff of black smoke with every shot. I'm planning on trying a faster powder to see if it burns cleaner. It's still accurate but Autocomp burns much cleaner in .40 & .45acp.
I gather that autocomp can be very clean, if you load it hot.
The powder likes to be pushed hard, and hodgon's data is simply too conservative to get it to do what it is supposed to
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Old 12-26-2011, 16:27   #13
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My newest data from the Hornady 2012 Annual shows 5" barrel with 155 XTP 1.260" using 8.9 Auto Comp going 1362 fps @ 35,700 psi...

While your data at 9.0 grains is probably safe you would be on your own above the listed data!
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Old 12-26-2011, 17:08   #14
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Gofastman, I can't help you with Autocomp, because I have no experience with it. However, I CAN achieve your desired goals. I've gotten 155gr Gold Dots and even 165gr Golden Sabers to 1400fps OUT OF MY STOCK G29 with 800-X. Also, 800-X gives me BY FAR the best performance out of my short barrel. I've gotten 135gr Nosler JHPs to 1600fps. All of this is with a stock G29 barrel. Another member, Kegs, has pushed the Noslers to a safe and consistent 1700fps out of his 4.45" KKM G29 barrel. Also, I ran them to 1800fps in my G20LS (same load that makes about 1575fps in G29), but found out my barrel had marginal support.

I've done LOTS of light bullet testing with 800-X, Blue Dot, Longshot, Power Pistol, and Unique, and all fell WELL short of 800-X. I only used standard, CCI 300 primers, and everything was out of my short G29 barrel. So, those two factors may have limited things. Mike Willard told me once that you must use CCI 350s for the light bullet Longshot loads. However, it's not necessary (or advisable) with 800-X. With all of the above powders (besides 800-X), I seem to hit a 1300-1350fps ceiling with light bullets in the G29 (using 135gr Noslers or 125gr Barnes TAC-XPs). With 800-X, I got the Noslers to 1600fps and the Barnes bullets to 1460fps (ran out of bullets or would have gone further).

Maybe Autocomp will work, but I can GUARANTEE that 800-X will get you there. If you want a 155gr bullet at 1500fps or a 135gr at 1700fps, that should be no problem with a G20 length aftermarket barrel. I can help you with starting loads to work up if you're interested.

Last edited by 21Carrier; 12-26-2011 at 17:10..
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Old 12-26-2011, 17:53   #15
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Maybe Autocomp will work, but I can GUARANTEE that 800-X will get you there. If you want a 155gr bullet at 1500fps or a 135gr at 1700fps, that should be no problem with a G20 length aftermarket barrel. I can help you with starting loads to work up if you're interested.
Wonderful, thanks a lot!
Im sure Ill be picking you brain frequently via PM

I have kind of avoided 800X for some reason, don't know why, I guess the poor metering thing kind of turned me off to it.

Im gonna continue to try to find AutoComp data, but I'll be picking up a LB of 800X if AC just wont do the trick.

The Barrel Ill be using for this will be a LWD threaded (5.2") and probably one of their comps (eventually).
I use a 24lb ISMI spring with hot handloads, too.

Last edited by gofastman; 12-26-2011 at 17:54..
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Old 12-26-2011, 21:14   #16
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AutoComp needs to be pushed hard to get ROI.
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Old 12-26-2011, 21:24   #17
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ROI?
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Old 12-26-2011, 21:47   #18
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Old 12-26-2011, 22:44   #19
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Quote:
Originally Posted by Meathead9 View Post
The smoke might be from the powder, but it's more likely caused by the moly/lead BC bullets. I'll bet if you loaded MG or Zero JHP's with it, the smoke would disappear. Autocomp should be a decent powder for 10mm, but I'll stay with 180's/200's & Longshot.
That's very possible but I'm using the same exact bullets in my .40s&w loads and it's as clean as a whistle. Sometimes I can't even tell I shot my G35 because it's so clean afterward. No joke.

I do want to try Longshot or 800x though. I gotz ta git me a chronograph.
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Old 12-26-2011, 22:50   #20
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ROI?
"Return on Investment."

I agree with the input that Carrier provided above.

For another option to consider: using factory book data, I am into the 1420s using Accurate #9 with my G20 stock 4.6" setup. If you are looking to stay within book loads, then #9 is a good option. The Accurate max is 15.9 gr at only about 33,000 psi. With the 5.2" tube, I imagine that you would get to the upper 1400s with book data. Of course, YMMV. 800-X will probably get there too, but be mindful that charge weights will be well beyond book data.

I am really interested in the AutoComp results, however. It is not a powder that I would have thought of for 10mm. From looking at the book load data, there are likely some more advantageous powders for 10mm. But it does not, by any means, appear to be unsuitable.

I doubt that you would be able to exceed the performance of 800-X for the 135 gr Noslers.
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