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 By Mike Coviello (Tanner)

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Winchester AutoComp Ball Powder


Looking for Winchester AutoComp Ball Powder Reloading Data for 9mm Luger 115 gr. FMJ Bullets? Trying to find it can be frustrating. The Hodgdon Reloading Data Center only lists 115 GR. LRN and 115 GR. SPR GDHP for 9mm Luger. There is no data for 9mm 115gr. FMJ, so I had to do my own testing and recipe analysis.

Winchester AutoComp Ball Powder
Winchester AutoComp Ball Powder

Laser Bullet for Gun Training

Reloading Components


AutoComp Ball Powder Reloading Data

Smokeless Powder


Lee Disk

Powder Charge

Shooting Results

Winchester AutoComp

Precision Delta, FMJ, 9mm, 115gr. COAL = 1.150 in.


3.8 gr.

Insufficient powder charge to cycle slide. Rounds fired fine in both the Glock 19 and the Glock 26 but would not eject the spent case. Tested 3/18/10.

" "


4.1 gr.

Insufficient powder charge to cycle slide. Rounds fired fine in both the Glock 19 and the Glock 26 but would not eject the spent case. Tested 3/18/10.

" "


4.4 gr.

Insufficient powder charge to cycle slide. Rounds fired fine in both the Glock 19 and the Glock 26 but would not eject the spent case. Tested 3/18/10.

" "


4.6 gr.

All test rounds shot well in both the Glock 19 and the Glock 26. Tested 3/18/10. Insufficient powder charge. See Update Below.

" "


4.6/4.7 gr.

Update! Made up 100 rounds of this recipie. Only 50% of thed rounds shot well in the Glock 26. Some stovepipes. Some failure to cycle. Insufficient powder charge Tested 4/1/10.

" " 4.8 gr. Made and shot by a friend in his new Gen 4 Glock 17. Insufficient powder charge to cycle slide. Many stovepipes. Some failure to eject.
COAL for all rounds = 1.150 inch

Test Results

On 3/15/10 I reloaded 10 rounds each of the above recipes in an effort to determine the proper charge weight of the Winchester AutoComp powder for 9mm Luger. All rounds were shot at the range and the results recorded in the above table. Conclusion: 4.6 grains is the minimum charge weight needed to properly operate a Glock 19 and Glock 26 when firing a 9mm Luger 115gr. FMJ Precision Delta bullet with a COAl of 1.15 inch. At this minimum charge weight the recoil experienced in both Glocks was mild and the spent cases were relatively clean.

4/1/10 Update: Relying on the results of my last shooting session I made up 100 rounds of 9mm Luger 115gr. FMJ Precision Delta bullet, 4.6 gr. AutoComp with an overall length of 1.150 inch. I was surprised to find that 50% of the rounds fired well. The rest caused stovepipes or failure to have enough force to cycle the slide. I ended up shooting most of these rounds loading them one at a time in the magazine and manually ejecting the spent casing. During the same shooting session my friend had made up and was shooting the same recipie of AutoComp but with 3.8 gr. and was shooting a new Gen 4 Glock 17. He has similar poor results. Apparently 4.8 grains is insufficient powder for 115gr. FMJ bullets with a COAL of 1.15. We need to do some more experimenting.


Winchester AutoComp Powder is a new powder recently made available to the general public. One and eight pound containers were made available at Winchester dealers in the Spring of 2009. Winchester AutoComp is rumored to be Winchester's factory powder used in many of their factory loads available for purchase to the public.


From the Winchester Web Site:
AUTOCOMP is extremely fine in the 38 Super, 9mm, 45 ACP and 40 S&W race guns. It’s just the perfect burning speed to feed the compensators with a higher volume of gas. With AUTOCOMP competitors get off faster shots with minimal muzzle flash, it’s a winner.



October 2008

For Immediate Release

Chris Hodgdon Public Relations Manager announced today a new powder for the discriminating competition pistol shooter AUTOCOMP™ WINCHESTER’S AUTOCOMP is highly suited for delivering maximum compensator performance.

“AUTOCOMP is extremely fine in the 38 Super, 9mm, 45 ACP and 40 S&W race guns. It’s just the perfect burning speed to feed the compensators with a higher volume of gas. With AUTOCOMP competitors get off faster shots with minimal muzzle flash, it’s a winner.”

Other characteristics of AUTOCOMP:

• Clean burning for efficient shot after shot function
• Low charge weights for economy reloading
• Flawless metering through progressive loading machines

One and eight pound containers will be available at Winchester dealers Spring 2009. AUTOCOMP data is now on-line in the Reloading Data Center. For more information call 913-362-9455 or write to 6231 Robinson, Shawnee Mission, KS 66202.


9mm Loads With Winchester AutoComp

..Mostly I load Unique with 115 grain FMJ, 115 gr JHP, 124 gr plated frontier, and "125" gr LRN. …Wanting to try a new powder, I picked up a pound of AutoComp a few months ago. This past week I finally loaded some rounds using 123 grain LRN set at 1.125 COL. …I loaded 10 rounds each at 4.0, 4.2, 4.4, 4.6, and 4.8 grain. I fired them in a Beretta 92FS Centurion (4-inch barrel) and got the following average velocity readings using a ProChrono from Competition Electronics for each load: 839, 750, 866, 952, 1007 fps. The Beretta failed to cycle properly at the first two loads, but starting at 4.4 grains, it seemed to work okay. I did not try to figure out my groupings at the time, but feel that I got a better group at 4.6 grains.

Recipe Testing and Evaluation

This week I had a friend visit from North Carolina. I took him to the range on Friday around 5pm to shoot. It was very busy and competition for brass was fierce (there were many reloaders). I was lucky to recover my own brass. While I was there I talked to a guy who was shooting 9mm Luger reloads using WINCHESTER AUTO COMP. He seemed to like it.

I decided to buy a pound of it and test it myself. It seems to be more readily available than TiteGroup or Winchester 231 powder but it is relatively new to the market. From the internet - "The reloading man at Cabella's said Winchester AutoComp is their factory powder used in a lot of their factory loads that has been released to the public."

I looked for a safe recipie for reloading 9mm FMJ Luger. The Hodgdon DataCenter and my Lee manual did not have it. Searching the forums and reloading sites did not have it . The email I sent to the Winchester site to request load data was returned as undeliverable. The local powder supplier did not have it. You would think that Winchester would have published and promoted this data if they wanted to sell their product.

I decided to determine my own load recipies for AutoComp. My thinking was as follows:

The most important thing is to find a safe DO NOT EXCEED value.

The below table is from the HodgdonReloading DataCenter for all of the AutoComp 9mm loads (all bullet weights).
Using the philosophy - the heavier the bullet the lower the DO NOT EXCEED value then the lower of the two values for the 125 grain bullets should be a good DO NOT EXCEED value for AutoComp using 115gr. FMJ.
DO NOT EXCEED = 4.8 grains.
This coincidentally matches the DO NOT EXCEED values of the lee manual for Titegroup and Win 231 for FMJ.


Feedback & Comments


I Prefer Titegroup Smokeless Powder

March 3, 2012
I prefer Titegroup as well, I do suggest that you weigh the powder charge instead of just going by the lee suggested disk size, I have found in every powder I use that the lee recommendation is lower than actual weight. it increased my performance and accuracy greatly.


Winchester AutoComp Smokeless Powder

March 3, 2012
You should be able to use the same load as the 115 GR. SPR GDHP, it is a Jacketed Hollow point, the only difference would be the OAL, HP bullets are shorter, if your bullets have the cannelure that should be the proper length, it should be a little longer than the HP bullets listed aol.


Reloading Data for Win 231

December 06, 2010
I am reloading 9mm for s/m mp9 and I have Winchester 231 I need to no how many grains of power to use with 115 grain and 124 grain bullets. Also the velocity for each of them?

Response - Howard,

That information is available at the Hodgdon Reloading Data Center



Winchester AutoComp Loads

April 18, 2010
I now have an excellent load for Berry's 9mm "plated" 115gr ammo. I had some charring on the side of the spent brass because gases were escaping from ignition. I put a firm crimp on the loaded round, and at 5.2gr, and OAL @ 1.1" all is fine. This is a great target round for me, and is very accurate. Winchester and Berry's Bullets were consulted in this issue. I would suggest that anyone who is having probs with their loads, give the manf's a call. Hope this helps.


Winchester AutoComp Loads

April 24, 2010
9mm Berry plated 115gr RN Win AutoComp / 4.4gr 1.135"
Too lite, won't cycle the action, leaves charring on side of spent brass

9mm Berry plated 115gr RN Win Auto/Comp / 4.8gr 1.135"
Too lite, won't cycle the action, leaves charring on side of spent brass

9mm Berry plated 115gr RN Win AutoComp / 5.0 gr 1.135"
Still need more powder, occasional cycling failure, sometimes stovepipes, and brass barely ejected from the gun. Still have charring on one side of brass as if it doesn't expand the case enough upon firing? Very inaccurate as well. My S&W m&p Pro is deadly accurate, but this load is all over the target. I am hesitating on going much higher then 5.1gr's, but I think it will be necessary, it just isn't enough power. I'm thinking it must approach 5.3-5.5gr?

Response - 5.1 grains of AutoComp with 9mm FMJ bullets from Precision Delta and a COAL of 1.14 - 1.15 in. seems to work well in Glocks (Glock 26, Glock 19 and the new Generation 4 Glock 17).

I too would not go any higher than 5.1 gr of AutoComp until Winchester officially publishes the proper load data. It amazes me that Winchester does not have this information widely available to the public.

I am hesitant to do any further experimenting with AutoComp since I had my first squib while testing different recipes of AutoComp for 9mm Luger. I think I will stick with official published data and proven time tested recipes and leave the experimenting to others. I was lucky with my squib in that the stuck bullet prevented the following round from feeding into the chamber, otherwise I could have had big trouble.



The following are some notes that I took while testing AutoComp.

I had made up 100 rounds of 9mm Luger with a recipe of 4.6gr. AutoComp, with 115gr. FMJ Precision Delta bullet and a COAL of 1.150 in. These fired well enough but proved to have insufficient pressure to cycle both the Glock 26 and the Glock 19.

Instead of breaking down and remaking each of the rounds I decided to experiment and see if a decrease in the COAL from 1.15 in. to 1.13 in. would have any effect on the performance in the same guns. One thing I failed to consider was if the shortened COAL was too short for the gun to feed properly.

My conclusions:

a.. 5 rounds used in testing a new recipe is not enough to begin mass production of the recipe. More rounds are needed for validation.

b.. A COAL of 1.130 in. (give or take a little) is too short for the Glock 26 and the Glock 19. Some rounds will feed properly at this length, others will not. I will stick with a COAL of 1.15 in.

c.. 5 gr. of AutoComp powder seems like it will work with 9mm, 115gr. FMJ bullets and a COAL of 1.150" but it needs more testing.

d.. About the AutoComp powder - The 5.0 gr. of AutoComp seemed to work OK in the Glock 19 and Glock 26 shooting 5 rounds in each of them. But, after having that squib I think I will put the AutoComp on the back shelf for a while until Winchester comes out with official load data for 9mm 115gr. FMJ bullets and more and more people have experience loading it. I think I will stay away from "experimenting" for a while and go back to loading the proven TiteGroup recipe.

AutoComp Test Loads Shooting Results

Glock 26 Glock 19

Qty Shooting Results Qty Shooting Results
5 gr. AutoComp; COAL = 1.13" 5 Good
5 Good
5 gr. AutoComp; COAL = 1.15" 5 Good
5 Good
4.6 gr. AutoComp; COAL = 1.123-1.128" 7 Jams
7 Good
4.6 gr. AutoComp; COAL = 1.131" 18 Jams
18 Squib; Jams; Cartridge is too short. Will not load from
magazine to chamber without jamming.
4.6/4.7 gr. AutoComp; COAL = 1.131" 25 Did not shoot.
25 Did not shoot.

During my testing of 4.6 gr. of AutoComp with a COAL of 1.131" in the above table I encountered my first squib.
The bad thing about it was that I did not know that I had a squib.

A Good Recipe for 9mm Luger with AutoComp?
My friend loaded 50 rounds with 5.0 gr. AutoComp with 1.14” COL and all fired well in the new Gen. 4 Glock 17.
The following week he loaded 100 rounds with 5.1 gr. AutoComp with 1.14 - 1.15” COL and all fired well in the Gen. 4 Glock 17.



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Mike Coviello is a former aerospace engineer, now Web Designer/SEO Consultant. Hobbies include shooting zombies & reloading ammunition.






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