FX Impact M3 Tuning Advice (inconsistency)

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Floridaman2005

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Oct 11, 2024
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So I have my Impact shooting pretty decent groups after tuning but most of my shot charts look like this. I am shooting 18.1g FX ammo at 120/85 bar and usually shoot between 880-900 fps.

I did notice my regs creep a little and that’s why the first shot is low, but why the buildup like that. Should I have more pressure at the rear reg so it has a stronger contact with the valve adjuster? I can’t figure out why my strings are like this. Anything I can fix?


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Here ya go:

FX - FX impact M4 velocity “warm up”

I’m wondering if someone can shed some light on this question. I’ve recently got an FX Impact M4 .22 700mm with slug power kit installed, heavy liner, carbon sleeve etc. If the rifle has been resting (but is room temperature) I notice it takes a good 10-15 shots for the velocity to get to...
www.airgunnation.com www.airgunnation.com
 
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Floridaman2005 said:
It’s a 500mm
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I was going to say low, I think he's having to open the valve too long to get the velocity. For Giggles I'd go up another 10 bar or so and start reducing his hammer/dwell. I'd also increase #1 to 140 faster refill. We don't see hit shot timing and with low pressure that'll play havoc with speeds...JMHO
 
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Floridaman2005 said:
So I have my Impact shooting pretty decent groups after tuning but most of my shot charts look like this. I am shooting 18.1g FX ammo at 120/85 bar and usually shoot between 880-900 fps.

I did notice my regs creep a little and that’s why the first shot is low, but why the buildup like that. Should I have more pressure at the rear reg so it has a stronger contact with the valve adjuster? I can’t figure out why my strings are like this. Anything I can fix?


View attachment 514956

View attachment 514957
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I can accept that 20+ FPS spread for a regulated airgun which cost s$300.
For an airgun that cost $2000+ not so much.

A $2000+ airgun better be almost perfect.
As in I can shoot it without tuning it.
 
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nobody1 said:
I can accept that 20+ FPS spread for a regulated airgun which cost s$300.
For an airgun that cost $2000+ not so much.

A $2000+ airgun better be almost perfect.
As in I can shoot it without tuning it.
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Well I’ve shot most groups with spreads around 5. This was after letting the gun sit for a few days and the first 20 shots of the day on it. The low first shots were due to a little reg creep but it took a little while before it leveled off. It’s definitely not tuned to perfection as this is my first PCP and first tune attempt. That’s why I came here for advice.
 
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Floridaman2005 said:
Well I’ve shot most groups with spreads around 5. This was after letting the gun sit for a few days and the first 20 shots of the day on it. The low first shots were due to a little reg creep but it took a little while before it leveled off. It’s definitely not tuned to perfection as this is my first PCP and first tune attempt. That’s why I came here for advice.
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It takes one shot with every other gun on the planet to clear what happens when your reg creeps a little. What you are experiencing is not your fault.
 
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