FX Is 100 fps drop normal for FX impact M3 in cold weather?

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Airgunsteve

Member
Apr 12, 2020
17
18
FL, United States
I realize that cold weather will cause a decrease in FPS. However, I’m not sure what is considered on average a “normal” or “acceptable” drop in fps. I’ve lived in Florida for the last 20 years where the weather is quite warm even during winter time. However, in Arkansas, the winters are considerably colder.

On August 13,2024, the temperature was about 82°F. My 28 shot string with my FX M3 showed an average FPS of 891 with extreme spread of 5 FPS and STD Deviation of 1.7 FPS. Today, the temperature is about 40°F. I shot myFX M3 in the colder weather, and my average FPS was 781 FPS with extreme spread of 54 FPS and STD Deviation of 12.4FPS.

When I shot my FX impact M2, there was very little change in the fps or extreme spread or std deviation whether in cold or hot weather.

I know that the M3 has a dual regulator snd the M2 doesn’t, but are these results typical for the M3 in colder weather? I also shot my FX Pantera in .25 caliber and only the first shot had a drop in FPS but then all other shots were consistent and had good extreme spread and low standard deviation. I also shot my Daystate Alpha Wolf and it was consistent without any drop in the FPS. Maybe the FX impact M3 behaves this way in cold weather? Has anyone else experience a similar situation? Any advice would be appreciated.

August 13, 2024 FX M3, JSB Exact Heavy 18.13gr

Shot count: 28
Low: 889 FPS
Hi: 894 FPS
Avg: 891 FPS
Spread: 5 FPS
STD Dev: 1.7 FPS


13-Aug-2024 17:59:20,889,FPS,31.6,FT Lbs,

13-Aug-2024 17:59:28,889,FPS,31.6,FT Lbs,

13-Aug-2024 17:59:37,889,FPS,31.6,FT Lbs,

13-Aug-2024 17:59:47,891,FPS,31.7,FT Lbs,

13-Aug-2024 18:00:03,889,FPS,31.6,FT Lbs,

13-Aug-2024 18:00:15,891,FPS,31.7,FT Lbs,

13-Aug-2024 18:00:23,890,FPS,31.7,FT Lbs,

13-Aug-2024 18:00:34,893,FPS,31.9,FT Lbs,

13-Aug-2024 18:00:46,893,FPS,31.9,FT Lbs,

13-Aug-2024 18:00:56,889,FPS,31.6,FT Lbs,

13-Aug-2024 18:01:05,894,FPS,32.0,FT Lbs,

13-Aug-2024 18:01:26,891,FPS,31.7,FT Lbs,

13-Aug-2024 18:01:35,889,FPS,31.6,FT Lbs,

13-Aug-2024 18:01:46,891,FPS,31.7,FT Lbs,

13-Aug-2024 18:02:15,889,FPS,31.6,FT Lbs,

13-Aug-2024 18:02:29,890,FPS,31.7,FT Lbs,

13-Aug-2024 18:02:37,890,FPS,31.7,FT Lbs,

13-Aug-2024 18:02:46,891,FPS,31.7,FT Lbs,

13-Aug-2024 18:02:53,893,FPS,31.9,FT Lbs,

13-Aug-2024 18:03:06,890,FPS,31.7,FT Lbs,

13-Aug-2024 18:03:15,890,FPS,31.7,FT Lbs,

13-Aug-2024 18:03:23,891,FPS,31.7,FT Lbs,

13-Aug-2024 18:03:31,889,FPS,31.6,FT Lbs,

13-Aug-2024 18:03:38,893,FPS,31.9,FT Lbs,

13-Aug-2024 18:03:47,894,FPS,32.0,FT Lbs,

13-Aug-2024 18:04:00,893,FPS,31.9,FT Lbs,

13-Aug-2024 18:04:09,893,FPS,31.9,FT Lbs,

13-Aug-2024 18:04:18,890,FPS,31.7,FT Lbs,


January 5, 2025 : FX M3 Airgun, JSB Exact Heavy 18.13gr

Shot count: 24
Low: 751 FPS
Hi: 805 FPS
Avg: 781 FPS
Spread: 54 FPS
STD Dev: 12.9 FPS

05-Jan-2025 09:40:15,751,FPS,22.5,FT Lbs,

05-Jan-2025 09:40:28,770,FPS,23.7,FT Lbs,

05-Jan-2025 09:40:39,770,FPS,23.7,FT Lbs,

05-Jan-2025 09:40:55,772,FPS,23.8,FT Lbs,

05-Jan-2025 09:41:20,762,FPS,23.2,FT Lbs,

05-Jan-2025 09:41:29,765,FPS,23.4,FT Lbs,

05-Jan-2025 09:41:42,770,FPS,23.7,FT Lbs,

05-Jan-2025 09:41:54,785,FPS,24.6,FT Lbs,

05-Jan-2025 09:42:15,773,FPS,23.9,FT Lbs,

05-Jan-2025 09:42:27,782,FPS,24.4,FT Lbs,

05-Jan-2025 09:42:42,778,FPS,24.2,FT Lbs,

05-Jan-2025 09:42:57,777,FPS,24.1,FT Lbs,

05-Jan-2025 09:43:12,791,FPS,25.0,FT Lbs,

05-Jan-2025 09:43:28,791,FPS,25.0,FT Lbs,

05-Jan-2025 09:43:40,786,FPS,24.7,FT Lbs,

05-Jan-2025 09:44:08,791,FPS,25.0,FT Lbs,

05-Jan-2025 09:44:19,793,FPS,25.1,FT Lbs,

05-Jan-2025 09:44:32,772,FPS,23.8,FT Lbs,

05-Jan-2025 09:44:42,786,FPS,24.7,FT Lbs,

05-Jan-2025 09:45:00,791,FPS,25.0,FT Lbs,

05-Jan-2025 09:45:11,805,FPS,25.9,FT Lbs,

05-Jan-2025 09:45:23,798,FPS,25.5,FT Lbs,

05-Jan-2025 09:45:36,795,FPS,25.3,FT Lbs,

05-Jan-2025 09:45:49,795,FPS,25.3,FT Lbs,
 
Airgunsteve said:
I realize that cold weather will cause a decrease in FPS. However, I’m not sure what is considered on average a “normal” or “acceptable” drop in fps. I’ve lived in Florida for the last 20 years where the weather is quite warm even during winter time. However, in Arkansas, the winters are considerably colder.

On August 13,2024, the temperature was about 82°F. My 28 shot string with my FX M3 showed an average FPS of 891 with extreme spread of 5 FPS and STD Deviation of 1.7 FPS. Today, the temperature is about 40°F. I shot myFX M3 in the colder weather, and my average FPS was 781 FPS with extreme spread of 54 FPS and STD Deviation of 12.4FPS.

When I shot my FX impact M2, there was very little change in the fps or extreme spread or std deviation whether in cold or hot weather.

I know that the M3 has a dual regulator snd the M2 doesn’t, but are these results typical for the M3 in colder weather? I also shot my FX Pantera in .25 caliber and only the first shot had a drop in FPS but then all other shots were consistent and had good extreme spread and low standard deviation. I also shot my Daystate Alpha Wolf and it was consistent without any drop in the FPS. Maybe the FX impact M3 behaves this way in cold weather? Has anyone else experience a similar situation? Any advice would be appreciated.

August 13, 2024 FX M3, JSB Exact Heavy 18.13gr

Shot count: 28
Low: 889 FPS
Hi: 894 FPS
Avg: 891 FPS
Spread: 5 FPS
STD Dev: 1.7 FPS


13-Aug-2024 17:59:20,889,FPS,31.6,FT Lbs,

13-Aug-2024 17:59:28,889,FPS,31.6,FT Lbs,

13-Aug-2024 17:59:37,889,FPS,31.6,FT Lbs,

13-Aug-2024 17:59:47,891,FPS,31.7,FT Lbs,

13-Aug-2024 18:00:03,889,FPS,31.6,FT Lbs,

13-Aug-2024 18:00:15,891,FPS,31.7,FT Lbs,

13-Aug-2024 18:00:23,890,FPS,31.7,FT Lbs,

13-Aug-2024 18:00:34,893,FPS,31.9,FT Lbs,

13-Aug-2024 18:00:46,893,FPS,31.9,FT Lbs,

13-Aug-2024 18:00:56,889,FPS,31.6,FT Lbs,

13-Aug-2024 18:01:05,894,FPS,32.0,FT Lbs,

13-Aug-2024 18:01:26,891,FPS,31.7,FT Lbs,

13-Aug-2024 18:01:35,889,FPS,31.6,FT Lbs,

13-Aug-2024 18:01:46,891,FPS,31.7,FT Lbs,

13-Aug-2024 18:02:15,889,FPS,31.6,FT Lbs,

13-Aug-2024 18:02:29,890,FPS,31.7,FT Lbs,

13-Aug-2024 18:02:37,890,FPS,31.7,FT Lbs,

13-Aug-2024 18:02:46,891,FPS,31.7,FT Lbs,

13-Aug-2024 18:02:53,893,FPS,31.9,FT Lbs,

13-Aug-2024 18:03:06,890,FPS,31.7,FT Lbs,

13-Aug-2024 18:03:15,890,FPS,31.7,FT Lbs,

13-Aug-2024 18:03:23,891,FPS,31.7,FT Lbs,

13-Aug-2024 18:03:31,889,FPS,31.6,FT Lbs,

13-Aug-2024 18:03:38,893,FPS,31.9,FT Lbs,

13-Aug-2024 18:03:47,894,FPS,32.0,FT Lbs,

13-Aug-2024 18:04:00,893,FPS,31.9,FT Lbs,

13-Aug-2024 18:04:09,893,FPS,31.9,FT Lbs,

13-Aug-2024 18:04:18,890,FPS,31.7,FT Lbs,


January 5, 2025 : FX M3 Airgun, JSB Exact Heavy 18.13gr

Shot count: 24
Low: 751 FPS
Hi: 805 FPS
Avg: 781 FPS
Spread: 54 FPS
STD Dev: 12.9 FPS

05-Jan-2025 09:40:15,751,FPS,22.5,FT Lbs,

05-Jan-2025 09:40:28,770,FPS,23.7,FT Lbs,

05-Jan-2025 09:40:39,770,FPS,23.7,FT Lbs,

05-Jan-2025 09:40:55,772,FPS,23.8,FT Lbs,

05-Jan-2025 09:41:20,762,FPS,23.2,FT Lbs,

05-Jan-2025 09:41:29,765,FPS,23.4,FT Lbs,

05-Jan-2025 09:41:42,770,FPS,23.7,FT Lbs,

05-Jan-2025 09:41:54,785,FPS,24.6,FT Lbs,

05-Jan-2025 09:42:15,773,FPS,23.9,FT Lbs,

05-Jan-2025 09:42:27,782,FPS,24.4,FT Lbs,

05-Jan-2025 09:42:42,778,FPS,24.2,FT Lbs,

05-Jan-2025 09:42:57,777,FPS,24.1,FT Lbs,

05-Jan-2025 09:43:12,791,FPS,25.0,FT Lbs,

05-Jan-2025 09:43:28,791,FPS,25.0,FT Lbs,

05-Jan-2025 09:43:40,786,FPS,24.7,FT Lbs,

05-Jan-2025 09:44:08,791,FPS,25.0,FT Lbs,

05-Jan-2025 09:44:19,793,FPS,25.1,FT Lbs,

05-Jan-2025 09:44:32,772,FPS,23.8,FT Lbs,

05-Jan-2025 09:44:42,786,FPS,24.7,FT Lbs,

05-Jan-2025 09:45:00,791,FPS,25.0,FT Lbs,

05-Jan-2025 09:45:11,805,FPS,25.9,FT Lbs,

05-Jan-2025 09:45:23,798,FPS,25.5,FT Lbs,

05-Jan-2025 09:45:36,795,FPS,25.3,FT Lbs,

05-Jan-2025 09:45:49,795,FPS,25.3,FT Lbs,
Click to expand...
No.

It sat for 6 months ?

Regulators operate on pressure, not volume.
 
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