From oversprung D460 to...

[splitbeing]

... 11.8 fpe K98 happy bird?

What fpe does your 460 platform prefer?

[Denby95]

I bought one of the new ARH 'full power' D460 offerings that was newly listed and then removed about a week later.. it took me down from an OEM 21 FPE to 17 FPE. Twang is gone but shot cycle seems equally as harsh as the OEM. I asked ARH if 17 FPE is what was to be expected and he said that was good... Probably gonna swap back to OEM as I'm not seeing any benefit and had expected full power.

[Mark 611]

Sometimes spring kits take some time to break in, did you change the piston seal? also SB 11.8ftlbs how does that shot cycle feel?

[Toxylon]

I bought one of the new ARH 'full power' D460 offerings that was newly listed and then removed about a week later.. it took me down from an OEM 21 FPE to 17 FPE. Twang is gone but shot cycle seems equally as harsh as the OEM. I asked ARH if 17 FPE is what was to be expected and he said that was good... Probably gonna swap back to OEM as I'm not seeing any benefit and had expected full power.

17 fpe, or 'hot HW95' power level out of a D460 is not good -it's not even passable, when full power is promised. The gun is a 24 fpe gun in .22 cal.

I get the feel that the true power level and only a week of being listed are connected.

[Back_Roads]

 Hmm my K98 came with no buzz and 17fpe 

[Denby95]

I bought one of the new ARH 'full power' D460 offerings that was newly listed and then removed about a week later.. it took me down from an OEM 21 FPE to 17 FPE. Twang is gone but shot cycle seems equally as harsh as the OEM. I asked ARH if 17 FPE is what was to be expected and he said that was good... Probably gonna swap back to OEM as I'm not seeing any benefit and had expected full power.

17 fpe, or 'hot HW95' power level out of a D460 is not good -it's not even passable, when full power is promised. The gun is a 24 fpe gun in .22 cal.

I get the feel that the true power level and only a week of being listed are connected.

That was my feeling exactly, the kit said full power. My tuned D34 shoots at 15.5 so being 1.5 FPE above that for what the D460 was designed for was not acceptable.  It's got about 500 shots through it so far, so I'll continue to let it break in a little before I get around to swapping to OEM. Picture of the kit for anyone interested (yes it was sent wrapped in foil).

I did not change the piston seal as I'd seen the piston seal recently previously when I switched the gun from dino to krytox and also wanted to only 1 change thing at a time to see how the new spring changed performance. So I chrono'd before, got 21 FPE, chrono'd after and got 17 FPE. Spoke to ARH who had said that was a good outcome but then the listing for that particular tune kit got removed from the website. So not really sure what to think.

Anyways to answer OP's question, 17 FPE has not been a noticeable improvement compared to OEM power levels, and not worth the loss of power for what the gun is supposed to deliver in my mind but also to each their own!

[splitbeing]

The shot cycle at 11.8 fpe is great! The gun feels just right and within the range of what it is made to do.

I had it at 14 fpe as well and that similarly felt so much better than OEM. However, I still thought it could be better.

The spring in it now is the OEM with coils removed and redressed. The length is enough to create pressure needed for the pins and all to hold. I am able to take it apart without a sash clamp now as well.

It is like a different gun.

My d48s, which use the same OEM spring, cock and shoot like they were made for that spring. The 460/k98 shoots harshly with the OEM spring and wonderfully with the spring shortened and 11.8 fpe.

[Toxylon]

I reckon this discussion hinges on the caliber in question.

Magnum springers in .177 cal are really different from the same guns in the bigger cals. I've done a bunch of .177 cal to .22 cal conversions on these, and the guns have basically started to work as they should with the bigger bore: everything smoother, while yielding heaps of more energy - a winning combo if any. Like Gaylord put it, having a magnum Diana in .177 cal is like having a Corvette with a V6.

The D460 is a very long-stroke springer, as most magnums are (not the HW80 / R1, but that's a borderline magnum anyway). What detuning a long-stroke gun does is make the gun much more hold sensitive: it's a long way to go for the mildly pushed piston, with plenty of time for the shot to go out of alignment, or assorted shooter errors taking effect. This is especially common when the detuning is achieved by just cutting coils. Hooray for those who get great accuracy regardless!

[splitbeing]

I reckon this discussion hinges on the caliber in question.

Magnum springers in .177 cal are really different from the same guns in the bigger cals. I've done a bunch of .177 cal to .22 cal conversions on these, and the guns have basically started to work as they should with the bigger bore: everything smoother, while yielding heaps of more energy - a winning combo if any. Like Gaylord put it, having a magnum Diana in .177 cal is like having a Corvette with a V6.

The D460 is a very long-stroke springer, as most magnums are (not the HW80 / R1, but that's a borderline magnum anyway). What detuning a long-stroke gun does is make the gun much more hold sensitive: it's a long way to go for the mildly pushed piston, with plenty of time for the shot to go out of alignment, or assorted shooter errors taking effect. This is especially common when the detuning is achieved by just cutting coils. Hooray for those who get great accuracy regardless!

That makes sense to me regarding the 460. I only shoot .177 but have a .22 460 at my buddy's. I'll have these thoughts in mind when bisiting him and shooting the .22.

I shoot the k98 (460 platform) open sights. I've noticed better accuracy since detuning,but I am also shooting it more rather than it sitting around not being shot.

These thoguhts do not line up with my experience of the d48s, which use the same spring with shorter stroke. Everything seems just right in the .177 caliber 48s.