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N320 loading data


osw333

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I had awful results with HP-38. Velocity all over the map. Like 80+ velocity spreads ( metered with a charge master 1500 and all same headstamp). N320 got me down to single digit SD values.

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On 2/15/2017 at 9:15 AM, osw333 said:


Are you happy with Blue bullet performance? Is cheaper than extreme?

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Very happy with blue Bullets. It's all I shoot now

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4.7gr of N320 with 180gr Blue Bullet. 1.185 OAL.

 

Average Velocity yesterday was 958.3, PF of 172.  Getting ready for Area 6!

 

Note, my latest batch of Blue Bullets are all under 180gr, around 178gr, whereas my previous batch were usually over at about 181gr.  Anyone else experience this?

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I've been using N320 in my STI Edge 5 inch but I haven't done much work with the chronograph.  Here are some loads that I've checked.

 

Bullet:  Blue Bullets 180 gr. FP
Powder:  Hodgdon Titegroup 4.3 grs.
Primer:  Winchester Small Pistol
Case:  Remington 
LOAL:  1.190
Avg. Vel.:  934.40 fps  
ES:  26.35
SD:  8.48
PF:  168
Recoil Spring:  Dawson tool-less guide rod, 14 lb. Recoil Spring and Buffer Pad

 

Bullet:  Bullet Works 180 gr. RNFP Plated
Powder:  Hodgdon Titegroup 4.8 grs.
Primer:  Winchester Small Pistol
Case:  Federal 
LOAL:  1.180
Avg. Vel.:  943.97 fps  
ES:  36.25
SD:  10.34
PF:  169
Recoil Spring:  Dawson tool-less guide rod, 12 lb. Recoil Spring and Aluma Buffer Pad

 

Bullet:  Bullet Works 180 gr. RNFP Plated
Powder:  Winchester WST 5.0 grs.
Primer:  Winchester Small Pistol
Case:  Winchester 
LOAL:  1.200
Avg. Vel.:  959.61 fps  
ES:  42.27
SD:  13.89
PF:  172
Recoil Spring:  Tool-less guide rod, 14 lb. Recoil Spring & Aluma Buffer Pad

Edited by pbcaster45
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  • 4 weeks later...

My friend who built my Limited gun suggested I start with VV N320 and WST powders for 180 grain cast HI TEK coated bullets. I settled on WST; I couldn't tell any difference in accuracy, feel of recoil, etc. I couldn't justify spending twice the $$ for VV N320 when WST worked just as well.

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  • 2 weeks later...
My friend who built my Limited gun suggested I start with VV N320 and WST powders for 180 grain cast HI TEK coated bullets. I settled on WST; I couldn't tell any difference in accuracy, feel of recoil, etc. I couldn't justify spending twice the $$ for VV N320 when WST worked just as well.

Definitely shopping for new powder soon. Is WST pretty clean powder? What is your load for it?

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Here ya go.

Created: 04/08/17 02:53 PM
Description: 40 S&W
Notes 1: 180 Cast Bullet
Notes 2: 4.6 grains WST
Distance to Chrono(FT): 10.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 180.00
Temp: N/A °F
BP: N/A inHg
Altitude: 600.00
#          FPS  FT-LBS      PF
10    948      359.26  170.64  
9    942      354.72  169.56  
8    974      379.23  175.32  
7    951      361.53  171.18  
6    942      354.72  169.56  
5    951      361.53  171.18  
4    945      356.99  170.10  
3    948      359.26  170.64  
2    945      356.99  170.10  
1    955      364.58  171.90  
Average: 950.1 FPS
SD: 9.4 FPS
Min: 942 FPS
Max: 974 FPS
Spread: 32 FPS
Shot/sec: 0.5
True MV: 951 FPS
Group Size (in): 0.00

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Here is some data shot on a different day.

 

Created: 04/22/17 01:11 PM
Description: 2011 Limited Pistol
Notes 1: 180 grain cast HI TEK Coated
Notes 2: 4.6 grains WST CCI SSP
Distance to Chrono(FT): 10.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 180.00
Temp: 69 °F
BP: 29.14 inHg
Altitude: 800.00
#          FPS  FT-LBS      PF
9    949      360.01  170.82  
8    955      364.58  171.90  
7    940      353.22  169.20  
6    953      363.06  171.54  
5    941      353.97  169.38  
4    944      356.23  169.92  
3    965      372.26  173.70  
2    944      356.23  169.92  
1    943      355.48  169.74  
Average: 948.2 FPS
SD: 8.2 FPS
Min: 940 FPS
Max: 965 FPS
Spread: 25 FPS
Shot/sec: 0.6
True MV: 949 FPS
Group Size (in): 0.00

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I was hoping someone would find this useful. I loaded the same basic components and tested on two different days. I like testing my loads under different conditions throughout the year. I believe this gives me a more accurate picture of my load.

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Thank you, this is very useful info. I need to get a Chrono soon. Anyone recommended a good accurate chrono without cost over $300?

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I had a CED Millenium and it was a pain but I tolerated it until it went south on me. I recently purchased the Pro Chrono, as recommended by many folks on this forum, along with the bluetooth adapter. It's awesome! The combo is will within your budget and will serve you well.

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I used a Caldwell ballistic G2 chronograph to check the loads in the two earlier post. I bought the G2 while on sale, i believe it cost me $184. I also have an older Prochrono that worked very well for 18 plus years. I only bought the G2 because the Prochrono started having problems (stopped picking up my shots) and I liked the concept of the G2. I think either will serve you well, and both chronographs are in your budget. 

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I had a CED Millenium and it was a pain but I tolerated it until it went south on me. I recently purchased the Pro Chrono, as recommended by many folks on this forum, along with the bluetooth adapter. It's awesome! The combo is will within your budget and will serve you well.

Before area 6 match i tried few chrono friend had, they was so inconsistent, I was so unsure before the match so i pumped up little more powder. Now try new powder it would be nice to know. I had eye on pro chrono, price is good, glad to know it's a good one. Thanks for the info.

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You bet. And the G2 looks good too but I've no experience with it. Even my Pro Chrono yields anomalies that are frustrating. I've spent the day developing various loads with great care. The plan is to chrono them tomorrow. Hopefully I'll learn a bunch but I'll learn something either way. I'll post my testing process and the results for all to see and comment under an new thread. If you don't see a post, I wasn't able to get to the range. It that's the case Friday will be my next opportunity.


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  • 3 months later...

Ok my load was good but my bullet is tumbling. MY cramp was 4.21 to 4.22, so i tried 4.23 and it was twice as bad. As yesterday i tried 4.20 and it fix the tumbling problem but now bullet speed from 970 down to 910. Is this pretty common? what is your cramp on 180gr? Thanks.

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180g bayou @ 1.180 OAL  4.5g VVN320 out of my STI DVC limited was making 173PF.

 

I could only get single digit deviations if I used the same manufacture of brass..  as you know the OAL floats a bit with mixed brass

Edited by jtrump
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On August 20, 2017 at 10:40 AM, osw333 said:

Ok my load was good but my bullet is tumbling. MY cramp was 4.21 to 4.22, so i tried 4.23 and it was twice as bad. As yesterday i tried 4.20 and it fix the tumbling problem but now bullet speed from 970 down to 910. Is this pretty common? what is your cramp on 180gr? Thanks.

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Did you ever get it figured out?

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