is it the seals

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   Great thread. I haven't followed it completely, but can the red dot withstand the recoil? Have you tried it with open sights, or a solid scope to eliminate one more factor? Those speeds aren't bad, and at 25 m, I would find it difficult to shoot groups.
Was there anyway to check the barrel crown? I believe this can effect accuracy quite a bit.

Smack me if this has already been covered.

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Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 10 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1411	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 22 Aug 2022 at 8:17pm
	Great thread. I haven't followed it completely, but can the red dot withstand the recoil? Have you tried it with open sights, or a solid scope to eliminate one more factor? Those speeds aren't bad, and at 25 m, I would find it difficult to shoot groups. Was there anyway to check the barrel crown? I believe this can effect accuracy quite a bit. Smack me if this has already been covered.

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 02 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2284	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 22 Aug 2022 at 5:50pm
	So gun back together. Everything polished, including trigger. Everything running smooth. (better than ever has) Trigger still way to much play before engages sear so might file that back a bit more or get a longer adjustment screw. New volicitys (about 30 shots in) Everthing in 700fps. Last 2 didgets every of shot. 12,05,10,16,19,15,12,13,12,15,09,17,15,14,05,07,05,00,17,17,15,16 HI:734 LOW:700 AVG:713 Re zeroed scope. Not happy with grouping. Trigger pull may be affecting my shooting. Pellet may be to lite for 700+fps Play more tomorrow. Pellets ftt 14.66gr. Had quick shot with aa16gr not much better. Any ideas why spreading? Including shooting techniques. ( I pull much tighter groups with tx at 50m) Comments appreciated. Edited by kruzaroad - 22 Aug 2022 at 5:52pm

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 02 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2284	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 18 Aug 2022 at 5:34pm
	nope made no difference end of piston so will scrap that idea.

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 02 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2284	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 18 Aug 2022 at 12:47pm
	That sounds perfect. I'm guessing your happy with the results. I've been looking into chrome polish for its abrasive qualities and it has two very soft/fine polishing compounds. I'm going to try a bit on the end of piston, clean it with solvent and see if it's smoother. If so I might do the barrel the same way. Lap it in. Probly do it after back together and tested.

Billbobnz Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 13 Jun 2020 Location: Ashburton Status: Offline Posts: 867	Post Options Post Reply Quote Billbobnz Report Post Thanks(0) Quote Reply Posted: 17 Aug 2022 at 9:39pm
	I did something similar until I brought a Brake cylinder Honing tool from repco

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 02 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2284	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 17 Aug 2022 at 7:52pm
	Have to laugh at myself. Went into mitre10 with the receiver tube, poping bits of round dowl in it to find the best size. Got back cut a line down middle feed sand paper into it rolled it around started to polish air chamber. Suddenly dawned on me as I was putting the 2000 grit on, I could have brought honing tool or sand paper holder for the drill that would have taken 1/5 of time lol

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 02 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2284	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 17 Aug 2022 at 1:43pm
	we will see. just in town now looking for 3000 grit sand paper. Can't find jb non embeding barrel cleaner anywhere. Of to repco see what valve grinding pastes they have. it's all fun. if it don't shoot well I'll turf the bloody thing.

Billbobnz Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 13 Jun 2020 Location: Ashburton Status: Offline Posts: 867	Post Options Post Reply Quote Billbobnz Report Post Thanks(0) Quote Reply Posted: 17 Aug 2022 at 1:00pm
	You will be surprised how good this thing shoots once you've cleaned and polished everything and removed all unnecessary movemen. I'm ordering new piston and breech seal for my Hatsan today as since the rebuild it has become inconsistent. At 40m the goruping was a vertical gorup and after a few shot through the chrony was a high of 728fps and low of 680fps, breech seal doesn't seam to be producing a tight seal. Thanks to Mercs I have all my guns barrel up so I'm going to check for lead in the cylinder. My brother in-law brought a Gamo mach 1 in .177 a couple of years ago he is shooting stoger x hollow 10.43gr pellets through it and still shooting 3/4" groups at 40m

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 02 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2284	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 17 Aug 2022 at 11:37am
	May have a found a big part of the issue going thru the schematic . Part number 16080 is totally missing. It's a spacer that stops the cocking arm from moving up when breaking the barrel.(checked out motion on gun this morning) I'm now of the opinion that the end of cocking arm has been lifting into the gas cylinder body and sliding along it, pushing it up, causing the ram to lift the piston. This has corrected itself when barrel closed but caused undue pressure on piston seal, metal on metal rubbing inside of reciever and probly uneven seating of the piston when cocked. Which would explain some of the peaks and drops in chrono readings as the tolerances would allow it to tilt. Wether it's broken or worn thru and fallen out, just dropped off as its a clip,out or was never there I have no idea but I've never seen it, or noticed it on my work bench. Emailed Vaughans for one this morning for new one.

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 02 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2284	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 16 Aug 2022 at 8:55pm
	I won't ditch gamo for their guns as ppl have good results with them, however as I have to assume this is how the gun is made and I can see major issues with it, I would not recommend the gamo swarm fusion 10x mag (Roadster version) to anybody.