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Author Topic: Playing with a 700mm FX STX "Heavy" liner fitted to the WAR Flex .... Whoa !!  (Read 878 times))

Offline Motorhead

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Just picked up a 700mm STX Superior Heavy Slug liner in .30 caliber ( 1-22 twist )
My War Flex had been running with the OEM 17" TJ's set up for high power, yet not leaned on so hard to be an air hog.  Shooting a JSB 44.75 gr at a 2400 psi set point there at @ 880 fps for @ 78 fpe give or take.
* Doing nothing but a barrel change to the 700 mm ( 27 inch ) the output has skyrocketed !!! Now the JSB 44.75 smokes out at @ 1005 fps for 100.3 fpe  :o :o
Loading up a 61.9 grain slug it's going to @ 870 fps for 104 fpe  ;)
  Crazy the power is so close with a dramatic weight change and pellet to slug ???

Oddly the gun appears no louder, actually quieter in residual report, but the snap is crisper. 

Spend a good part of the day machining the needed parts and pieces to adapt it.  Took an @ 3/4" piece of a cut off 16mm barrel that has 1/2-20 threading and bored it out for a light press fit over the liner which is @ .395" diameter.
Then with Aluminum machined up a 3 1/2" sleeve at 1/2" O.D and I.D for the liner to fit the WAR receiver. Put in a snap ring groove & Drilled a 1/4" transfer hole & deburred.  Light press fit the parts with Loc-Tite 640 sleeve retaining compound we have a complete barrel and Thin Noodle really bendy one at that !!
Next needed to fabricate the shroud, using a JSAR air stripper / end cap and DOM 1" tube was able to square up everything, get a thin nylon compression collar for tube to butt against at receiver.  Tightening down the end cap placed the barrel in STRETCH or as we say ... TENSIONED. Now Long and Stiff  ???

Not shot for accuracy yet .... had customer jobs to do as well and will for a few weeks yet.  It is at least assembled now for another days testing.

Scott S
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Offline oldpro

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At least a picture or two
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Online SpiralGroove

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At least a picture or two

Yeah ... Really Scott - No pics  ??? :P
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Offline anti-squirrel

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I recall seeing some threads at The Other Place RE: FX barrels and carbon sleeves being used to good effect on other brands, so this just adds to the excitement.
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Offline dan_house

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no pics.. didnt happen :)

so you gearing up for EBR or RAMC next year?
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Online JuryRigger

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Wow.... That's quite a jump, with just a barrel change...
Any theories as to the why's? Smoother ID, looser ID? Slower twist using less energy to give rotational velocity?
Jesse
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Offline D-RIG

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Yep I'm going to go along with the other post and say a picture or 2 would be great .
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Offline Glem Chally

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Wow.... That's quite a jump, with just a barrel change...
Any theories as to the why's? Smoother ID, looser ID? Slower twist using less energy to give rotational velocity?
Jesse

Probably the 10 inches of extra barrel mostly.
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Offline bear air

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Following along. Can't wait to see the flex and some target work. I always enjoy your threads Scott.
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Online SpiralGroove

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Wow.... That's quite a jump, with just a barrel change...
Any theories as to the why's? Smoother ID, looser ID? Slower twist using less energy to give rotational velocity?
Jesse

Probably the 10 inches of extra barrel mostly.
+1 ;)
  • Bothell, WA
PCP's:
AR2079A-HPA (.177)
AR2079A-HPA (.22)
BSA R10 (.177) Huma Regulated
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RAW HM1000x LRT RED - (.25)
QB78 (.177) OEM

Pumper's:
1973 Benjamin Franklin 342
1984 Benjamin Franklin 347

Springer's:
Beeman R9   (.20) - Circa 2019
Beeman R10 (.20) - Circa 1988
HW30S (.177)
HW35E (2) (.177)
HW35E - Silver (.177)
HW50S (.177)
HW50S - Silver (.177)
HW80 (.20)
HW95 Hybrid (HW98 stock) (.177)

Offline Motorhead

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I will say that the FX Slug liner creates a lot less drag when pushing a slug end to end .. a Lot less than the TJ barrel.
While i do agree LENGTH has a lot to do with it ... less in-bore drag from 4 narrow lands certainly is helping too.
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Offline dan_house

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 "less in-bore drag from 4 narrow lands certainly is helping too."

you said slugs... and then I dont get it.... so the slug is NOT "riding" on the entirety of the bore diameter, just the lands? SO only 4 points of contact with the bore....so less friction. But how does it seal ? or am I missing something (always a possibilty...) 
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Offline Motorhead

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Appears NOT .... Pushing a few .300 slugs, NSA & others, there is no groove contact, only land.  Sighting down bore with slug down a few inches there is just a  very vague trace of light around it.  So very very close but no contact.
Land lines on a pushed threw slug are well defined so there is good bite on keeping the spin going by the looks of it.

As to the seal or a slight lacking off is doubtful to creating much loss or air being the total area on .30 is so great. Big blast of HP air and slugs gone !!!
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Online SpiralGroove

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Did someone mention ... we need pics :D?
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PCP's:
AR2079A-HPA (.177)
AR2079A-HPA (.22)
BSA R10 (.177) Huma Regulated
RAW HM1000x LRT Camo - (.22)
RAW HM1000x LRT RED - (.25)
QB78 (.177) OEM

Pumper's:
1973 Benjamin Franklin 342
1984 Benjamin Franklin 347

Springer's:
Beeman R9   (.20) - Circa 2019
Beeman R10 (.20) - Circa 1988
HW30S (.177)
HW35E (2) (.177)
HW35E - Silver (.177)
HW50S (.177)
HW50S - Silver (.177)
HW80 (.20)
HW95 Hybrid (HW98 stock) (.177)

Offline Motorhead

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Ok folks ... went back into it increasing the throat depth so slugs would just be seating into rifling as well pellets.  SO took some pictures for Ya !!
Chrony shot is with a NSA 49 grain dish base ... 957 fps = 99.63 fpe  Yea that's healthy enough  ;D

Being we could NOT machine in o-ring grooves either side of transfer port due to the liner ... opted to machine the slip fit sizzle tight. Then placing a 1mm o-ring against breech face, then washer & clip. When drawn into tension the o-ring crushes into the small bevel on receiver/ barrel hole & crushes in enough to flush up & make a seal.

Last pic was my idea to stabilize liner within the shroud.  What is ?  It's a core of a printing paper roll LOL    Made a split sleeve to snap over the liner having the paper roll core press over it. Then slightly built up the O.D. with @ 2 wraps of gorilla duct tape for a firm press fit into shroud tube.  No internal shakes or vibrations now !!  This Roll Core allows air to pass threw it between webs allowing the entire shroud length to be effective !

Only played a bit this morning for accuracy 80 yards able to hit walnut size rocks shot after shot easily !!!!!  Paper is going to be another day.

Scott S

« Last Edit: November 06, 2021, 03:27:42 PM by Motorhead »
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Offline Motorhead

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Also make note on the 4th picture the COLLAR up against the receiver on the shroud mounting shoulder. It is NYLON and gives tad bit of yield when tensioning the barrel and helps stabilize the shroud assembly letting it find it's natural square to base position.

Also on picture 6, is a Donny FL TATSU Moderator that is threaded on a dummy 1/2-20 stud on forward side of Butt plate.  Muzzle has a thread protector cap in place and if you need to hush it down simply swap em out.   Interesting tho is the fact the rifles not that loud for making 100 fpe and this has a lot to do with the JSAR inspired hybrid balanced valve, SSG hammer spring and light hammer. Air delivery is switch on / switch off fast having a fairly short dwell cycle Just a quick SNAP firing cycle.

 

Scott S
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Offline oldpro

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Offline scottyathome0

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Always interesting !
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Offline dan_house

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Big blast of HP air and slugs gone !!!

ok, gotcha. And didnt remember it was 30 cal.....
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Daisy Red Ryder modded and tuned


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Offline Motorhead

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Just a follow up on a few fronts  ;D

Cold Shot with a NSA 47.2 grain .... 1000 fps for 104+ Ft lbs.

Seems the hammer sticksion is 100% gone. This due to using a Glass filled acetal poppet and X ring within my custom balanced valve configuration.

So we now have total confidence in picking this beast up and sending a shot on target not worried about the PITA sticky valve / cold shot issues of the past.    STOKED !!!!

Scott S
  • Northern California ... Old Hangtown
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