I just went through my .177 460, bringing the power up from sub12ftlbs. I had detuned previously to use "common" pellets, but have a HW97 to fill that role now and the 460 hasn't had much use lately. Now with the OEM spring again, I noticed power is on the high side. Honestly didn't own a chrony when I initially bought the gun, so not certain of original numbers.After some slight dieseling, the gun settled in the 930's with H&N Baracuda Hunter 10.49gr pellets, low of 933, high of 938 over a dozen shots or so (shot 40-50 shots to help things settle down before chrony-ing). Quite a few right at 935-936 fps, so not sure if gun is still lightly dieseling, as there's no smoke after the shot. Are these "normal" power levels for the .177 460? Lol, this 460 in .177 makes as much power as my .22 caliber 470TH and 98K, just surprised me a bit...
Hector, thanks for the reply.At 25-30 yards, groupings have been great, unfortunately when I pushed the H&N B.H. pellets to 50+ yards I did encounter some issues, especially with a light head-wind helping the deceleration/over stabilization (starting to corkscrew), lol. I was hoping they would fair well at distance, but physics decided otherwise. I'll include a photo below.Before I detune the gun I'll test some Beeman/H&N Silver Points I have on hand, they're slightly heavier at 11.(?) grains. I'm hoping they're accurate, but only own one gun that ever liked them.I'll be traveling soon and hope to take the 460 with me. It's (potentially) silly accurate and lighter than the 54 Air King Pro. But either one will serve me well while away.Circled in the photo below are the first five shots from this morning at 52 yards, using Baracuda hunters. Shortly after I was chasing my tail trying to dial it in before I realised the issue...
Hector, thanks for the response.I tried using the Beeman Silver Arrow pellets (not the silver points, lol) which were 11.5gr, but they didn't fair very well in the 460.The H&N Baracuda Match pellets are sometimes hard to come by now, but will attempt to acquire some. The main reason for using the Hunter 10.49gr pellets is I bought quite a few a couple years back, when they were on sale (200 count tins). I do have some JSB and Air Arms 10.3's on hand, I'll also give them a try. Just waiting for weather to play nice when I have time available.Worst comes to worst, I could space up the spring I had in there previously, which needed more preload. The spring settled a bit, and was shooting H&N FTT's at 770fps, give or take. It was very accurate, but trajectory wasn't as flat as I wanted at range.I'll get things sorted eventually, lol. Take it easy.
Pravin, thanks for reading and the reply. The 460 in 4.5mm/.177 caliber is one of my favorites, doesn't seem very talked about nowadays. Seems you have yours all sorted out Thank you for giving velocity and pellets used. I was having an internal battle on what power level to tune for based on Hector's velocity advice, lol. I figured either 17-18ftlbs with 10.3-10.5 gr pellets or 13-14ftlbs with 8.4-8.6gr pellets. I'm now thinking 13-14ftlbs is the way to go Take care
Velocity wise, this 460 has come full circle. I was shooting H&N FTT's (8.6gr) at 770 fps when I detuned, and now I'm shooting JSB Monsters (13.4gr) at 770-775 fps. Lol. I have yet to make any internal adjustment to the gun. Velocity is still about 930 +/- with the Baracuda Hunter 10.49's after several hundred shots. The 13.4gr pellets (in .177) seem to be straining the power plant a bit, indicated by the feed back from the spring and the lower FPE output, but they are very accurate and predictable in the wind (which there has been plenty of). Normally I would use the JSB monsters in a pcp, but have been impressed with the results in this springer. No target cards to display at this time, but when I read the wind correctly I can hit a 1.25" spinner at 50 yards, and no issues hitting the 2.5" spinner, even with stronger gusts of wind. For fun I strung up a tin just shy of 60 yards and peppered it with holes Not exactly target work, but very entertaining. When the winds subside I will print some groups to see what's to be had. I still need to dig out the JSB 10.3's to test... eventually ; )I'm not sure how long the 460's internals will hold up to these heavy pellets, but I have seals and springs on hand if the need arises. Hoping to stretch the range further, but may possibly be asking too much for the .177. Would be fun to do a comparison between .177 and .22 at 75+ yards one of these days.Thanks for reading, take care.