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 Post subject: FN57 and AR57 Chronograph Data, plus more!!!!
PostPosted: Fri Jun 11, 2010 10:20 am 
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Joined: Thu Jan 28, 2010 7:56 am
Posts: 98
Location: Carlisle, PA
Of note: went to the range last night and did a test with SS197, and SS195 with my new Chronograph. Here are the results:
temp. 72, low humidity, wind 1-2 mph 1800-1945 hours EDT

SS195
AR57: 2368, 2398, 2393, 2385 & 2415 fps Avg. 2391 "Factory": 2470 / Difference -170 fps
FN57: 1926,1937,1987, 1932, & 1924 fps Avg. 1941 "Factory" 1970 / Difference -29 fps
450 fps difference, 40 fps gain per bbl"
SS197:
AR57: 2070, 2032, 2063, 2089, & 2080 fps Avg. 2066 "Factory" 2100 / Difference -44 fps
FN57: 1672, 1654, 1662, 1670, & 1664 fps Avg. 1664 "Factory" 1675 / Difference -11 fps
402 fps difference, 36 fps gain per bbl"

Also tested:
9mm: 5" bbl consistently gave + 30 fps over 3.8" bbl
.380acp: Sellier & Bellot gave an avg of 998 fps out of 3.75" bbl- my favorite food for the PK380 Remington came in at 957 fps avg.
.243 Winchester: Hornady Custom 58gr V-max moly Avg of 3467 fps vs factory stats of 3750 fps.
** found that there is an average of 260 fps velocity loss between factory stats on a 24" bbl, vs. my Rem 700 VTR 22" bbl using 3 types of Hornady ammo including 95gr SST Custom and 80 gr. GMX Superformance

Kilo


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 Post subject: Re: FN57 and AR57 Chronograph Data, plus more!!!!
PostPosted: Sun Jun 13, 2010 12:06 pm 
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WTF

Joined: Tue Jun 01, 2010 2:34 pm
Posts: 946
Location: SoCal
I love reading posts like this...

You should keep it up and post more results if and when you come across some of the other 5.7 variants.


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 Post subject: Re: FN57 and AR57 Chronograph Data, plus more!!!!
PostPosted: Mon Jun 14, 2010 5:55 am 
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Joined: Thu Jan 28, 2010 7:56 am
Posts: 98
Location: Carlisle, PA
thanks


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 Post subject: Re: FN57 and AR57 Chronograph Data, plus more!!!!
PostPosted: Mon Jun 14, 2010 8:01 pm 
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Joined: Sat Jun 12, 2010 11:43 pm
Posts: 28
To have relevant data you need to include barrel lengths. How long of a barrel did your AR57 have?


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 Post subject: Re: FN57 and AR57 Chronograph Data, plus more!!!!
PostPosted: Mon Jun 14, 2010 9:05 pm 
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Joined: Sat Dec 06, 2008 12:56 am
Posts: 3089
Location: Lone Star State
We always appreciate members taking the initiative to share data. Thanks!



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 Post subject: Re: FN57 and AR57 Chronograph Data, plus more!!!!
PostPosted: Mon Jun 14, 2010 9:23 pm 
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Vindicated

Joined: Tue Sep 02, 2008 11:44 am
Posts: 3780
Location: VA
good man. thanks


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 Post subject: Re: FN57 and AR57 Chronograph Data, plus more!!!!
PostPosted: Tue Jun 15, 2010 5:13 am 
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Joined: Mon Jan 26, 2009 10:27 pm
Posts: 205
Location: Anchorage, AK (expatriated to SC)
WA-Tom wrote:
To have relevant data you need to include barrel lengths. How long of a barrel did your AR57 have?

Quote:
450 fps difference, 40 fps gain per bbl"


Do the math


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 Post subject: Re: FN57 and AR57 Chronograph Data, plus more!!!!
PostPosted: Tue Jun 15, 2010 7:00 am 
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Joined: Thu Jan 28, 2010 7:56 am
Posts: 98
Location: Carlisle, PA
16"


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 Post subject: Re: FN57 and AR57 Chronograph Data, plus more!!!!
PostPosted: Tue Jun 15, 2010 12:59 pm 
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Joined: Sat Jun 12, 2010 11:43 pm
Posts: 28
Thanks! Thats what I thought, but I could not assume you were not using an NFA length rifle barrel.


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