Auto comp

[earlbob]

I thought it was short for a 38 super load to, I load mine at 1.265. I do not load 9mm Major so OAL is an unknown. Wonder what these are for?

[JDBraddy]

Sorry, the gun is chambered for .38 SuperComp, Federal Primers being softer than most, will show pressure sign sooner. I'm using WSP primers. Altatude is 750ft above sea-level. Looks like I need to bump it up another quarter-grain. If primers start to flatten, then perhapse I can lengthen OAL a bit.

124gr Montana Gold JHP

7.25gr Win Auto-Comp

OAL = 1.190

String #4

Min Vel = 1304.27

Max Vel = 1353.26

Avg Vel = 1323.38

PF = 164.1

Extreme Spread = 48.99

Standard Dev. = 16.4

String #5

Min Vel = 1294.65

Max Vel = 1340.38

Avg Vel = 1321.40

PF = 163.8

Extreme Spread = 45.73

Standard Dev. = 13.34

Tried some for the first time today, I have a Caspian with three port comp and two poppel holes.

Weather conditions where sunny with 3-5mph wind gusts, 81 degrees farenheight, here's my results.

124gr Montana Gold JHP

8.5gr True Blue

OAL= 1.190

Max Vel = 1356

Min Vel = 1338

Avg Vel = 1344

PF = 166.7

Extreme Spread = 18.3

Standard Dev. = 6.0

124gr Montana Gold JHP

7.0gr Win Auto-Comp

OAL = 1.190

Max Vel = 1318

Min Vel = 1276

Avg Vel = 1301

PF = 161.3

Extreme Spread = 42

Standard Dev. = 10.6

No pressure sign observed. It was noticably milder report than the True-Blue. I intened to bump it up by 0.2gr incriments and see if it makes major before showing pressure sign.

I love information like this but if someone is not familiar with the various overall lengths then they would have no idea what cartridge is being discussed and even then one might still wonder, least I do.

earl

Those are either very short 38 Supers or very long 9 mm. I would be a littel apprensive at stuffing 8.5gr of TruBlue behind a 124gr in 38 Super 1.240, I tried it and my primers went very flat at 8.4gr and looked like they were at the verge of puch thru. I was using Fed SP which I like to test with since they show pressure signs before it gets out of hand. I read that primers can affect pressue up to 2,000 CUP, maybe they are are the high pressure generators of the lot.

[earlbob]

Thanks for the input. I like the idea of sticking with the small pistol primers as much as possible.

earl

[CocoBolo]

JBrady runs a Caspian 38SC that might explain the odd length. Its an old school gun so if AutoComp works for him it means it puts out lots of gas. I would recommend AA#7 or N105 with 115gr bullet for that old school gun.

I have a bunch of 9 Major loads to test this week with AutoComp, HS6, AA#7, and N350. N350 & TruBlue perform very similar in 38 Super except for pressure and TB is dirty. With the smaller charge weight in N350 I think it will be a no go, but make major easily.

[Intel6]

I copied the data in my post form this thread:

9x23 & Autocomp thread

Neal in AZ

I shot these over the IR screens of a CED M2

These were shot out of a 9x23 SV Factory gun with 4x hybrid holes and the long comp.

Case: Winchester

Bullet: 124 MG CMJ

Primer: CCI SR

LOA: 1.260"

7.2 grs. Autocomp

10 shot avg: 1346 fps

PF: 166.9

7.4 grs. Autocomp

10 shot avg: 1372 fps

PF: 170

[BlackBuzzard]

Last week I did a extended comparison of HS6 and Autocomp side by side.

Both loads were 172PF with 115 MG JHP - 9mm major, 1.165 oal.

HS6 has slightly less recoil snap. It also has less dot amplitude (up down motion) shot to shot.

Fired from full length barrel gun - no holes.

Still the differences are not great IMO.

Autocomp is cleaner, but the messy nature of HS6 is easy to clean up as it doesnt get baked on hard to surfaces.

I'm sticking with HS6 though I have 8pound of AC to use up.

BB

Edited March 15, 2010 by BlackBuzzard

[PINMAN44]

Black buzzard PM incoming

[Foxbat]

Fox what is your OAL??? Are you seeing any pressure signs? What primers are you using?

Thanks

Robby

At this point using 1.265"-1.270", Remington SP, no signs of overpressure at all.

[PINMAN44]

My bad fox, I'm using 9mm I didn't know u were using that in a super

Thank you though!!!

[BMartens]

Last week I did a extended comparison of HS6 and Autocomp side by side.

Both loads were 172PF with 115 MG JHP - 9mm major, 1.165 oal.

HS6 has slightly less recoil snap. It also has less dot amplitude (up down motion) shot to shot.

Fired from full length barrel gun - no holes.

Still the differences are not great IMO.

Autocomp is cleaner, but the messy nature of HS6 is easy to clean up as it doesnt get baked on hard to surfaces.

I'm sticking with HS6 though I have 8pound of AC to use up.

BB

Sent you a PM with a couple questions on the 115 grain loads.

[JDBraddy]

Since everyone here seems to think I'm loading too short, I changed my seating die, I loaded some up with

124gr MG JHP

7.5gr Win Auto-Comp

OAL 1.260

String #1

Min Vel = 1344.25

Max Vel = 1385.00

AVG Vel = 1368.9

PF = 169.7

Extreme Spread = 40.75

Standard Dev. = 11.83

String #2

Min Vel = 1318.9

Max Vel = 1368.25

AVG Vel = 1351.7

PF = 167.6

Extreme Spread = 49.34

Standard Dev. = 16.61

It was flat shooting an comparatively mild, it easily makes major without any pressure sign, it was accurate, and cycles well in my gun. I think I just found my new load!!!

Sorry, the gun is chambered for .38 SuperComp, Federal Primers being softer than most, will show pressure sign sooner. I'm using WSP primers. Altatude is 750ft above sea-level. Looks like I need to bump it up another quarter-grain. If primers start to flatten, then perhapse I can lengthen OAL a bit.

124gr Montana Gold JHP

7.25gr Win Auto-Comp

OAL = 1.190

String #4

Min Vel = 1304.27

Max Vel = 1353.26

Avg Vel = 1323.38

PF = 164.1

Extreme Spread = 48.99

Standard Dev. = 16.4

String #5

Min Vel = 1294.65

Max Vel = 1340.38

Avg Vel = 1321.40

PF = 163.8

Extreme Spread = 45.73

Standard Dev. = 13.34

I love information like this but if someone is not familiar with the various overall lengths then they would have no idea what cartridge is being discussed and even then one might still wonder, least I do.

earl

Those are either very short 38 Supers or very long 9 mm.

[RickyH]

Pinman44 did you get any info on Auto comp 9mm yet?

[Alan Adamson]

Pinman44 did you get any info on Auto comp 9mm yet?

There is lots of information on Autcomp in 9mm... Major that is... I run around 7.16gr at 1.190 oal in a 9Major gun with a MG 124 JPH, makes 170-1 PF and shoots nice. That in a 5" gun with no poppels.

Alan

[nYdGeo]

JBrady runs a Caspian 38SC that might explain the odd length. Its an old school gun so if AutoComp works for him it means it puts out lots of gas. I would recommend AA#7 or N105 with 115gr bullet for that old school gun.

I have a bunch of 9 Major loads to test this week with AutoComp, HS6, AA#7, and N350. N350 & TruBlue perform very similar in 38 Super except for pressure and TB is dirty. With the smaller charge weight in N350 I think it will be a no go, but make major easily.

You're right on about N350 in a .38 Super. I loaded 1000 115's and 1000 124's using N350, which in spite of the small charge size is a very slow powder (just has a high nitroglycerin percentage, so it makes more energy per grain). I know of several 9mm Major shooters that swear by N350. But because of the small charge size in the .38 Super case, it is obviously much harder on the cases than some of the other loads I've shot, especially the 124gr rounds. On the other hand they felt exactly as soft as the IMR 7625 loads at the same PF, but were obviously much flatter shooting to all three shooters involved.

I haven't tried Autocomp yet, but so far the nicest combo of reasonably soft and extremely flat shooting, with excellent rise 'n' fall dot movement I've found for my .38 Super is 12.0gr of AA#7 behind a 115 launched by Wolf SP primers. Cases look a bit better than after N350, primers are fine, and surprisingly clean.

I do hope to test Autocomp soon and compare it to the #7 loads. I'd love to find something that shoots as amazingly flat as the #7 loads but with a smaller charge weight.