FX M4 with hybrid slugs

Keep us informed. It will help get many pointed in the right direction when they come searching. I have one hot rod slugger and two 930ish sluggers. I enjoy shooting the 930’s more. One .22 and one .25. Just friendly little guys.

Oh, you inspired me to revisit the heavy liner in my 500mm Impact. It’s a little sweatheart in .22 in the 920-930 range. But very sensitive to keeping it on track. I will try the warp speed approach and see what happens. I don’t need this gun on my upcoming hunting trips so I’ll have all winter to try to get it back to where it’s at now if things don’t work out. I got it back to behaving after my last venture when I cut the chokes off heavy and standard liners and tested them. But it took a while to find that almost perfection again.

Update: I failed. Back to standard and 935fps. I tested from 1,000fps down to 965fps. At certain points I had decent groups at 30 and 50. But not the single hole at 30 and the all cutting at 50 like I’m used to. I hope you find a good setting that’s consistent.

Michael said:

None of my barrels (liners) yielded the results I wanted at 985 FPS. The standard liner was ok, the heavy liner was better, but I’m looking for greatness.

I detuned it a bit down to 930 FPS for the 22g Hybrids, and 880 FPS with the 25g Hades Monsters (I’ve got a feed lot pesting trip coming up ). Now it’s shooting ridiculously smooth and quiet.


I should get a chance to test it tomorrow.

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That's what i found with the NSA 23gr 2175 slug as well, my M4 is a lot quieter and tame at 940~950fps than when i had it at 980~1000fps. I kept the reg at 120 bar to also drive the 25gr AEA pellets. 45~50ft-lb seems to be the sweet spot for my bone stock M4 without pushing it too hard, very snappy and fun to shoot.

Michael said:

I was hoping to find a barrel that liked both the FX Hybrid slugs and the JSB Hades Monsters. Unfortunately I couldn’t find a barrel that liked both.

The Hades Monsters decided they liked the 1:24 liner at 890 FPS


The FX Hybrids flew better at 930 FPS than 980 FPS for me. They liked one of my 1:24 liners better than the other, but clearly liked the 1:18 Heavy liner best. These are all 10 shot groups at 55 yards in rather windy conditions.

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Interesting. I'm curious.....since these Hybrid is partially based on pellet design, I'm wondering if they would fly even better at 880~890fps with the standard Superior STX liner (1:24?) that came with the M4? Another thing that you could try with these FX Hybrid is with a shorter burst of slightly higher pressure air, perhaps 120 to 125 bar at the reg, with lower Valve and Micro (HS) to keep the speed back down to 880~890 fps.

Michael said:

I was hoping to find a barrel that liked both the FX Hybrid slugs and the JSB Hades Monsters. Unfortunately I couldn’t find a barrel that liked both.

The Hades Monsters decided they liked the 1:24 liner at 890 FPS
View attachment 504869

The FX Hybrids flew better at 930 FPS than 980 FPS for me. They liked one of my 1:24 liners better than the other, but clearly liked the 1:18 Heavy liner best. These are all 10 shot groups at 55 yards in rather windy conditions.
View attachment 504872View attachment 504871View attachment 504870

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Appears it likes the 25gr a lot. I did have some luck with the 27gr H&Ns around 960+. What barrel length are you using?

How do you like those Monster Hades? at 25.39gr they look beastly as hell compared to the regular 15.89gr Hades. That's some heavy hitter right there, probably going to rip right through any squirrels.

Did you happen to try any MRD’s to compare to the Monster Hades? Just curious if they will shoot well. I had to get them zipping from a heavy liner to get tight groups.