FX FX Crown MII GRS

[Jspool]

Hi all, I just placed an order for an FX Crown MkII GRS. I’ll use it in 25 yrd benchrest and field target.
Its chmbered in .177.
I have no experience with FX products and do not know how to get a good sub 20fpe tune with a 10.34 pellet.
Any suggestions for an initial setup would be greatly appreciated.

 

[alpineboard]

Got the grs continuum this past May. I started with neutral cam hammer spring, and worked up from there. Presently at 130 bar , 760 fps, 27 hn slug, with the 380mm barrel. The 700mm will do approx 850 at 110 bar with same.
Hint, check your barrel spacer distances. Watch the youtubes on tuning.

 

[Mcleod]

Crown MKII .177
500mm barrel
Fill ~250 bar
Reg pressure 100 bar
Front wheel - medium
Power wheel - 12
FX pellets- 10.3gr
~935.4 FPS

 

[Jspool]

Does the MKii tune the same method as the original Crown?

 

[Jspool]

Got the grs continuum this past May. I started with neutral cam hammer spring, and worked up from there. Presently at 130 bar , 760 fps, 27 hn slug, with the 380mm barrel. The 700mm will do approx 850 at 110 bar with same.
Hint, check your barrel spacer distances. Watch the youtubes on tuning.

Sorry, do the barrels need to be gapped?

 

[Goldwing]

Hi all, I just placed an order for an FX Crown MkII GRS. I’ll use it in 25 yrd benchrest and field target.
Its chmbered in .177.
I have no experience with FX products and do not know how to get a good sub 20fpe tune with a 10.34 pellet.
Any suggestions for an initial setup would be greatly appreciated.

Depending on the size of your hands the GRS is pretty chunky and not really made for walk about hunting, I sold my GRS stock for a more traditional stock.
The GRS is the heaviest of all FX stocks for the Crown, made especially for bench and not that good for bench at that.
And no where to put a rear worm screw adjuster or any rail for a front bipod ether, stuck with a bunch of sand bag clutter
Went this way with a custom made rear mount for the Saber monopod system (no sandbag crap needed)

 

[Jspool]

I have XXL hands so I’m good with a man sized stock. I have machined delrin 6”x3” rests with a picatiny clamp for forearm benching on a SEB rest. Rear stock sits in a deap eared sandbag. I’ve always been able to adapt my guns to the bench. For my N50 gun I use a one piece rest.

 

[alpineboard]

Sorry, do the barrels need to be gapped?

There are support spacers inside the barrel shroud, to support the barrel, as the barrel is only attached at the receiver end, it free floats, kind of, but these spacers aid in its support and need to be in proper positions. I got my crown last May , and wish I had checked them immediately. There is a youtube vid on this, can not seem to find it now, search FX barrel swap,replace, or similar.

 

[markT]

I'm thinking .177 Caliber.. Chamber would be for a cartridge.. example .223 Remington / 5.56 N.A.T.O.

 

[Jspool]

I'm thinking .177 Caliber.. Chamber would be for a cartridge.. example .223 Remington / 5.56 N.A.T.O.

Guess my brain still operates in powder burner mode! Whats the location called where the pellet gets seated then?

 

[Jspool]

Depending on the size of your hands the GRS is pretty chunky and not really made for walk about hunting, I sold my GRS stock for a more traditional stock.
The GRS is the heaviest of all FX stocks for the Crown, made especially for bench and not that good for bench at that.
And no where to put a rear worm screw adjuster or any rail for a front bipod ether, stuck with a bunch of sand bag clutter
Went this way with a custom made rear mount for the Saber monopod system (no sandbag crap needed)

View attachment 380437

Nice looking rig

 

[JohnAnkers]

Hi, barrel to shroud spacer positions? Do you have any recommendations please. The one at the end of my barrel came off and was left in the shroud. I damaged it refitting the barrel, so removed the spacers and found the POI moved left 20mm at 10 metres. I was also hoping that with them removed and the barrel free floating, the group size might reduce. It didn't! The groups were better before removing the spacers. I'm wondering about indexing the barrel, any experience? Cheers, JohnGot the grs continuum this past May. I started with neutral cam hammer spring, and worked up from there. Presently at 130 bar , 760 fps, 27 hn slug, with the 380mm barrel. The 700mm will do approx 850 at 110 bar with same.
Hint, check your barrel spacer distances. Watch the youtubes on tuning.

 

[alpineboard]

Muzzle end spacer approx 2 to 3 " from the end, then equal distance spacing for the others, electric tape both sides to prevent movement. Just indexed my barrel, sighting it on a machined strait edge level with a pen light behind it, magnifier glasses, it was tough to see, it was very strait for 70% of the length, then at the end it had a very slight up turn, approx 7 to 8", 10 to 20 thousands of inch max. I postioned the up turn at 12 oclock. I used silicone grease on the orings for a better sliding spacer without movement. After indexing the barrel, Got a new 6 0clock group location from what was a sighted in bench position, up 40 clicks, then down 8 clicks, the rest were all 10's, seems reasonable, with a 24 twist stx barrel using 25.4 grain slug, 100 yards, at 140 bar, 984 fps.
Got some JSB pellets 25.4 coming to try in the pellet barrel, also some HN 21 and 23 slugs, will see soon.