FX Tuning Fx Impact .30

[hgatesm]

Hello,

I have recently acquired an FX Impact M4 in .30 cal. 700mm barrel, tungsten hammer, slug probe.

I truthfully am very lost in trying to get this thing tuned, I thought I had it close a couple of times but then get to the range and end up running out of air before I can get to anything conclusive. I am having a hard time figuring out what setting to have the valve/regulator/wheels (macro/micro) at, I have watched several of the youtube videos out there and some information seems to be contradicting. I just want this gun to shoot accurately so any help would be greatly appreciated! Thanks in advance!

 

[zerochance]

I’m afraid I’ve picked the wrong rifel to start it’s so finicky I’m lost and ready to throw in the towel

If you ever decide to sell your Impact M4, let me know...

But jumping in head first is a dangerous act. I think it's best to have Utah Airgun tune it to whatever you're shooting.
I just bought a Impact M4 Compact in .25. I had Utah Airgun tune it, but I didn't like the tune so I ended up re-tuning it to shoot NSA .29gr slugs at 933 fps. It shoots very well but take it with a grain of salt... I am shooting at 12 yards because that's what I got. 2 inch targets

 

[Jerry w]

If you ever decide to sell your Impact M4, let me know...

But jumping in head first is a dangerous act. I think it's best to have Utah Airgun tune it to whatever you're shooting.
I just bought a Impact M4 Compact in .25. I had Utah Airgun tune it, but I didn't like the tune so I ended up re-tuning it to shoot NSA .29gr slugs at 933 fps. It shoots very well but take it with a grain of salt... I am shooting at 12 yards because that's what I got. 2 inch targets

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Bought the gun at piramid air — they sa it’s my scope hedged on when I ordered it 30 cal BeReal then sold me 200 rounds of 44.5 slugs then tell me I should had it tuned for slugs! My fault go figure if you were a sales man would you think and realize hay this guy 30 peels 30 cal berrall needs a fax tune!!!!!!! Noooo sent me bone stalk rifel anow say it’s my fault for not getting a tune price was no prob——— so went to Utah air an bought fox king 30 cal scope rings,scope tuned to 44.5 slugs wala priamid lost a sale and happy went ther Mary way. They did not handle the customer right salesman dropped the cabbages I’m through with pm air been a customer over 10 plus so that’s my rant spread the word— regards Jerry old blister

 

[Jerry w]

I have a 0.30 caliber, 700 mm barrel M3 tuned to shoot 44.8 grain domed FX diabolo pellets out to 60 yards.

At 60 yards outdoors I can put 20 consecutive shots inside a 2" tip to tip diamond target under normal wind conditions.

Indoors at 20 yards my 5 round group sizes are consistently between 0.036" and 0.40" edge to edge.

I tuned the rifle to "group size" Indoors at 20 yards.

Because I was testing 6 different brands/weights of pellets I set my plenum pressure to 120 bar for my heaviest pellet.

I began testing with the following settings: Air valve at 4, Macro at 8, Micro at 3.

I shot two 5 round groups for each pellet then increased the Macro 1 click and repeated.

I continued this process until the Macro was at 16.

I was fortunate that just 1 brand and weight of pellet outperformed the others. I then returned the Macro to the setting that produced the smallest group for that pellet.

I then advanced the Micro 1 click and shot two 5 round groups and continued this process until the Micro was maxed out. I then set the Micro to the setting that produced the best groups.

With the Macro and Micro set, I used a chrono to set the Air Valve. I turned the valve clockwise 1/4 turn, shot a 5 round group and continued this process until velocity just dropped. The rifle will also quiet down a fare amount.

Then I indexed the liner 1/8 turn clockwise, shot a 5 round group and repeated this process until the liner had been rotated 180 degrees. The POI shifts were ridiculous and the group size did NOT change and I was using a Targetshooting.com one piece rest and maintaining the same POA.

Once sighted back in at 20 yards, I took the rifle outdoors and shot groups at 20, 30, 40, 50, 60, and 70 yards. Past 60 yards the diabolos would spiral and the groups would open up a fare amount.

This is not the quickest way to tune an Impact but I enjoyed the process very much and learned a lot about my Impact and diabolo pellets.

Hope this helps.

Troy

Have an m4 never tryed pellets wanted slugs only only piramid sold me a bone stalk pellet platform along with 30slug barrel I’m pissed they say it’s my fault for not getting a fav tune for slugs butt sent me 200 rnds of slugs and tureens and said it’s my fault for not ordering fav tune so now I have pellet rifel that will half to bee tuned pellet shooter will need help there !!! Regards jerry

 

[Jerry w]

I’m going keep it as pellet gun not happy with piramid it’s a loooooong story 30/22 pellets are now what I’ll use

 

[Jerry w]

Went to Utah’s air gun store bought a new fx king in 30 cal tuned scope mounts 44.5 grain slugs piramid sold me the right gun(fx m4)but screwed me on the tune thy say my falt so utaha got the sale i will not trade with again been a costomer with them 15 yrs thanks will need some help with the fx pellet tune ! Regards jerry

 

[Troy Bakel]

Have an m4 never tryed pellets wanted slugs only only piramid sold me a bone stalk pellet platform along with 30slug barrel I’m pissed they say it’s my fault for not getting a fav tune for slugs butt sent me 200 rnds of slugs and tureens and said it’s my fault for not ordering fav tune so now I have pellet rifel that will half to bee tuned pellet shooter will need help there !!! Regards jerry

My original goal for the 30 cal was to target shoot at 100 yards.

Outdoor testing of AEA, FX, and JSB 44 to 50 grain round nose diabolos proved that the Internal and External Ballistics with various tunes and plenum pressures (120 -150 bar) we're not going to be competitive beyond 70 yards.

I sent the rifle to Mr. Buck at Cape Fear AG LLC and had him do a 4 year maintenance on the rifle, replace the regulators and the 700 mm barrel with a 600 mm barrel and tune it for 60 yards so I can suck at N50 instead of sucking at 100 yard benchrest.

Mr. Buck's tune is Air Valve - 3.0, MA - 16, MI - 3.5, plenum -120 bar, 880 to 885 fps (5 shot average 1 min wait between shots) for all 3 brands of pellets

The rifle is very good at 50 yards with all 3 brands of pellets, the same at 60 yards.

If I increase the Micro to 4.5 the 50.15 grain JSB are good out to 70 yards.

It seems that as long as these diablos are rising or flat at the target distance you are okay. If they are falling at the target distance the groups are going to open up. If you speed them up the External Ballistics get worse and they spiral.

I don't know offhand what the twist rates are for both the 700 and 600 mm barrels but they are different.