I know I'm late to the party but my D460 is shooting at ~900+ FPS and ~19ftlbs of energy with 10Gr pellets. I purchased it from PYRAMYD several years ago
Right, another update for those who are interested.Following Hector's advice, I removed the D48 breech seal supplied in the Vortek kit and reinstalled the OEM seal.That sounds easy enough however getting the D48 seal out took quite a bit of perseverance but I got there in the end without damaging anything other than the seal. The OEM seal was still in perfect shape so I put it back in..After thoroughly cleaning the inside of the compression tube with alcohol, I lightly lubed the under-side of the compression tube (outside), and around the piston skirt with moly grease. The piston seal felt a little tight, so I smeared a single drop of silicon oil around the outside diameter of the seal where it would contact the compression tube. I then lightly smeared some sticky grease on the main spring and put it all back together again. The piston seal still feels a little tight (I think), but it's still new so maybe it will loosen up a bit. I have a Vortek piston seal on hand but don't know if that would be any better?After a couple of warm up shots I chronographed the rifle as follows.H&N FTT 8.64gr = Avg 895 fps, 15.4 fpeJSB Exact Diablo 8.44gr = Avg 930 fps, 16.2fpeThat's about a 90 fps increase over what the gun was doing out of the box.Cocking smoothness was much improved, and there's no spring twang at all.I think it will shoot faster if I can address the piston seal tightness.Unfortunately after a total of about 30-40 shots, the rifle started to detonate. The noise level increased about 3x, velocity dropped significantly, and some smoke leaving the breech of the barrel was evident. At this stage I was pretty "over it" so I left it there. Any ideas as to why the dieseling? Obviously it is due to lubricant in the compression chamber igniting but how? The only lube to go near the piston seal was the single drop of silicon oil I smeared on the seal when reinstalling the piston. I'd be prepared to accept that as the cause, but if that was the case, why did the dieseling only start after about 30-40 shots? Could it be the moly grease I smeared on the piston skirt has found its way up past the piston seal and into the compression chamber?I'm intending to disassemble the rifle again to install the PG4 kit sometime soon, however before I do I'd like to understand what the cause of the dieseling may be so I can avoid it in the future. Thoughts?All the best,
Just to follow up on the legal/technical aspects; today DIANA International Marketing Mgr answered they were not aware of the situation, and that they agreed to the point that once everyone is licensed, there is no power limit in the country.They will look into production and shipping protocols and will surely solve this.It will take time.From the moment a decision is made till the time the specific market actually sees the effect, a year may pass.Hopefully, there will be some information flow to the distributors and shooters won't have this problem in the future.Keep well and shoot straight!HM
Quote from: HectorMedina on March 18, 2024, 09:18:04 AMJust to follow up on the legal/technical aspects; today DIANA International Marketing Mgr answered they were not aware of the situation, and that they agreed to the point that once everyone is licensed, there is no power limit in the country.They will look into production and shipping protocols and will surely solve this.It will take time.From the moment a decision is made till the time the specific market actually sees the effect, a year may pass.Hopefully, there will be some information flow to the distributors and shooters won't have this problem in the future.Keep well and shoot straight!HMHi Hector.I'm very grateful for the guidance you have provided, and for your efforts in making the Diana brand representation a better experience for shooters like myself. It's employees like you that make all the difference, thank you.In the meantime, I am following your advice and continuing to "shoot in" my D460.I haven't even put a scope on it yet, however yesterday I ordered a Diana bullseye ZR mount. I'll probably start with a UTG bug-buster because I've got one hanging around and they seem to hold up okay on my other air guns.Thanks again and all the best,
Quote from: Thumpa on March 18, 2024, 06:07:25 PMQuote from: HectorMedina on March 18, 2024, 09:18:04 AMJust to follow up on the legal/technical aspects; today DIANA International Marketing Mgr answered they were not aware of the situation, and that they agreed to the point that once everyone is licensed, there is no power limit in the country.They will look into production and shipping protocols and will surely solve this.It will take time.From the moment a decision is made till the time the specific market actually sees the effect, a year may pass.Hopefully, there will be some information flow to the distributors and shooters won't have this problem in the future.Keep well and shoot straight!HMHi Hector.I'm very grateful for the guidance you have provided, and for your efforts in making the Diana brand representation a better experience for shooters like myself. It's employees like you that make all the difference, thank you.In the meantime, I am following your advice and continuing to "shoot in" my D460.I haven't even put a scope on it yet, however yesterday I ordered a Diana bullseye ZR mount. I'll probably start with a UTG bug-buster because I've got one hanging around and they seem to hold up okay on my other air guns.Thanks again and all the best,Are you sure that the BugBuster will fit the ZR mount.? It has very short mounting area. Measure twice.......-Y
I think that as the 460 piston seal wears in the pellet speed will pick up a little more speed as Hector said and 10+ gr pellet will perform quite well and will keep the detonation to a minimum. I always use synthetic grease on all my AG's especially my springers.