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9mm Major load development 115CMJ with Silhouette


Chillywig

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I have been wanting to try out some MG 115CMJs. Silhouette is the powder I have been using so this what I started with. Chronoed the past two days and am needing to up my POWER factor a bit more

 

Here is what I have done

7.8gr 1430fps 10 shot average

8.1gr 1451fps 10 shot average

8.2gr 1461fps 10 shot average

 

Should I continue to up the powder or possibly start changing OAL to get that last little bit of power factor?

Edited by Chillywig
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OAL is a measurement that

1st fits your mag

2nd fits the chamber of your gun with the "plunk" (drop, spin and tip bbl back and let round fall out) test

3rd only by necessity, causes the best feeding in your gun after the first two criteria are met.

 

So your course of action is ladder the powder up until you make the PF you want or see pressure sign you don't want.

Or change powders etc. BUT lots of folks make great loads in Major PF with Silhouette!

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OAL is ~1.160

 

KKM barrel so much longer than that and it will quit spinning on the plunk

My other gun also has a KKM barrel but drives the same loads about 3PF higher - I assume the popholes size accounts from the difference

 

Looking at the way those results are trending I might have to push the load beyond 8.5gr to get a 172 PF

Edited by Chillywig
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LOoking forward to seeing your results. I’m in the middle of doing the same thing with Sil as well. If you haven’t seen pressure signs from the brass I would keep working up the load as well. I’ve got some loaded at about 8.0 grn behind a 115. Unfortunately I haven’t had time to chrono those yet so they’re just sitting around for now. I have loaded and fired 8.3  behind a blue bullet 125 (weighs in at about 128) and I didn’t see any pressure signs in my brass. I wouldn’t be surprised if you have more room to play with.  So far I’m loving the result of sil.

 

forgot to mention I loaded around 1.160

Edited by CamboSoup22
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Sil is a great powder but had two con areas for me when I was testing it. One - it was inverse temperature sensitive so know your temps and what to expect for PF for different temperatures. If you normally shoot in temperature stable place, then no worries. It also seemed to very from lot to lot quite often so always chrono your loads between lots. Two- the yellow residue left behind in the gun was annoying to me. It seemed to get the gun dirtier than I wanted in those all day long matches but not a huge deal. All in all, a great Open powder but HS6 is still my favorite.

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Limcat 8.46 Silhouette 
Shots: 10
Average: 1509 FPS
SD: 8 FPS
Min: 1496 FPS
Max: 1522 FPS
Spread: 26 FPS
Power Factor Average: 173
Power Factor Low: 172
Power Factor High: 175
Barometric Pressure: 30
Temperature: 65
Weight: 115 grains
--------------------------
Name: Limcat 8.36 Silhouette 
Shots: 10
Average: 1490 FPS
SD: 4 FPS
Min: 1481 FPS
Max: 1496 FPS
Spread: 15 FPS
Power Factor Average: 171
Power Factor Low: 170
Power Factor High: 172
Barometric Pressure: 30
Temperature: 59
Weight: 115 grains
--------------------------
Name: Limcat 8.2 Silhouette 
Shots: 10
Average: 1461 FPS
SD: 7 FPS
Min: 1449 FPS
Max: 1473 FPS
Spread: 24 FPS
Power Factor Average: 168
Power Factor Low: 166
Power Factor High: 169
Barometric Pressure: 30
Temperature: 62
Weight: 115 grains
--------------------------
Name: Limcat 8.1 Silhouette 
Notes: 8.1 silhouette 
Shots: 9
Average: 1451 FPS
SD: 5 FPS
Min: 1444 FPS
Max: 1457 FPS
Spread: 13 FPS
Power Factor Average: 166
Power Factor Low: 166
Power Factor High: 167
Barometric Pressure: 30
Temperature: 62
Weight: 115 grains

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Look at this 115CMJ load shot from different guns

 

--------------------------
Name: CK arms 8.46 Silhouette 
Shots: 10
Average: 1538 FPS
SD: 8 FPS
Min: 1527 FPS
Max: 1555 FPS
Spread: 28 FPS
Power Factor Average: 176
Power Factor Low: 175
Power Factor High: 178
Barometric Pressure: 30
Temperature: 65
Weight: 115 grains
--------------------------
Name: Limcat 8.46 Silhouette 
Shots: 10
Average: 1509 FPS
SD: 8 FPS
Min: 1496 FPS
Max: 1522 FPS
Spread: 26 FPS
Power Factor Average: 173
Power Factor Low: 172
Power Factor High: 175
Barometric Pressure: 30
Temperature: 65
Weight: 115 grains

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Here is the comparison of the two guns shooting a Montana gold 124 HP OAL1.140

 

Name: CK Arms 124
Notes: 7.3 silhouette 
Shots: 8
Average: 1383 FPS
SD: 8 FPS
Min: 1371 FPS
Max: 1396 FPS
Spread: 25 FPS
Power Factor Average: 171
Power Factor Low: 170
Power Factor High: 173
Barometric Pressure: 30
Temperature: 56
Weight: 124 grains
--------------------------
Name: Limcat 124
Notes: 7.3 silhouette 
Shots: 10
Average: 1359 FPS
SD: 7 FPS
Min: 1348 FPS
Max: 1377 FPS
Spread: 29 FPS
Power Factor Average: 168
Power Factor Low: 167
Power Factor High: 170
Barometric Pressure: 30
Temperature: 56
Weight: 124 grains
--------------------------
 

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  • 2 weeks later...

I had heard of the reverse temp sensitivity of Silhouette. Did some shooting - same load same gun no cleaning in between to examine PF difference at 63 and 30 degrees.

 

Name: Limcat 8.5 Silhouette 
Notes: Cold outside 
Shots: 7
Average: 1531 FPS
SD: 11 FPS
Min: 1518 FPS
Max: 1552 FPS
Spread: 34 FPS
Power Factor Average: 176
Power Factor Low: 174
Power Factor High: 178
Barometric Pressure: 30
Temperature: 30
Weight: 115 grains
--------------------------
Name: Limcat 8.5 Silhouette 
Shots: 10
Average: 1521 FPS
SD: 9 FPS
Min: 1504 FPS
Max: 1534 FPS
Spread: 30 FPS
Power Factor Average: 174
Power Factor Low: 172
Power Factor High: 176
Barometric Pressure: 30
Temperature: 63
Weight: 115 grains
--------------------------
 

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On 11/30/2017 at 12:59 AM, gng4life said:

Sil is a great powder but had two con areas for me when I was testing it. One - it was inverse temperature sensitive so know your temps and what to expect for PF for different temperatures. If you normally shoot in temperature stable place, then no worries. It also seemed to very from lot to lot quite often so always chrono your loads between lots. Two- the yellow residue left behind in the gun was annoying to me. It seemed to get the gun dirtier than I wanted in those all day long matches but not a huge deal. All in all, a great Open powder but HS6 is still my favorite.

When shooting the 124HP out of the CK I always got the yellow looking powder residue. With the 115CMJ loads I am not seeing hardly any of the residue. Not sure if its because of a higher pressure or something else...

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3 hours ago, Chillywig said:

Jury is still out Scott - hope to do some more experimenting this winter

 

When you get your gun re-chambered in 9mm I'll let you try some too...

Sweet sounds good. I have some super Comp loaded with mg115hp with hs6. Haven’t got a chance to to shoot em yet

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