RAW Rapid HM1000x SSG Set Up

[Slyde]

I will TRY to keep this short.

I am trying to set up a SSG on my .30 HM1000x, I’m just doing it for the heck of it. I am using the stock spring right now. Last night I set it up shooting ~900 FPS with the AEA 45’s. It was roughly 70* with a bit of humidity. This was set up with a .050” SSG gap. The intent was to shoot it today trying small HST settings to see how it would shoot.

Today it was 80*(90* where I was shooting from) with a bit higher humidity. I started with the AEA 45’s. It was shooting 956-963 FPS. I could not back the HST out enough to get the speed to change before the HST was hitting the stock(I know this isn’t the correct approach to tune but I was experimenting).

I tried shooting the AEA 50.5’s and the were around 898-900 but the balance of the HMx was off and it didn’t shoot them well. Didn't seem able to tune it effectively.

I tried some Zan 50.3 and they were 950’s also and didn’t shoot particularly well.

Any idea what may have happened? Can 10* to 20* increase and higher humidity make this kind of difference that can’t be tuned out with HST?

Any advice appreciated,
Brian

 

[Motorhead]

Sounding like you need to start clipping spring coils as with the springs greater preload when contained within a SSG devise it is over driving hammer.
SSG's don't offer broad tuning, but do offer very consistent & low ES shots when calibrated correctly.
Reg Pressure, Hammer weight & stroke, Spring rate of the SSG assembly all need to be adjusted / corrected to have the PCP operating at a specific output being caliber & projectile weight specific.

 

[Slyde]

Thank you Motörhead. That all makes sense.

 

[mubhaur]

As per my experience, with correct spring in SSG and after market high efficiency valve, more range becomes available for tuning.

Further, if external plenum is added, it become even better.

 

[Cloud9AG]

You don’t need an aftermarket valve. It just needs proper tuning like Scott said. An SSG can help make the rifle a little more efficient but makes tuning a little more complex.

 

[Slyde]

Thank you all for commenting. I appreciate all the information!

 

[Tricky-Dicky]

I find that stroke is a big factor in getting an SSG to work well, once you find a spring rate that works 0.050" is way too small IMO and will still be causing hammer bounce, I usually work on 1mm as the minimum gap.

 

[Slyde]

You are right, at .050" it still had bounce.

 

[Cloud9AG]

I find that stroke is a big factor in getting an SSG to work well, once you find a spring rate that works 0.050" is way too small IMO and will still be causing hammer bounce, I usually work on 1mm as the minimum gap.

Is .050” too small of a gap or too big? The reason I ask is because 1mm is smaller than .050”, and you said that is a good starting place.

 

[Motorhead]

Is .050” too small of a gap or too big? The reason I ask is because 1mm is smaller than .050”, and you said that is a good starting place.

Ideally the free flight gap you should try and keep under 2mm or @ 3/32"
* If setting up say a FT rig ... Minimal gap yields the lowest ES.
Need some speed adjustment range run more gap so if you reduce gap you pick up some speed, gap wider you decrease speed a tad.

 

[Tricky-Dicky]

Is .050” too small of a gap or too big? The reason I ask is because 1mm is smaller than .050”, and you said that is a good starting place.

I said 1mm would be the minimum, usually it's more like 3 to 6mm.

 

[Hobbyman2007]

Don’t forget to have the hammer as slick as possible. Minimal lube and highly polished . This keeps it as consistent as possible. I typically set them up with under a mm of gap. But some rifles prefer a bit larger.