Stroke lengths, TP sizes and SCR for various springers...

[bigtoe01]

you can tune springers to shoot heavy pellets more efficiently, this is done with stroke and transfer port, shorter stroke and so smaller TP to give a higher peak pressure and would you believe a springer starts acting like a PCP.

when i did that 25mm 80 you shot at the bash Bruce originally it was favouring 16 to 20gr pellets more than 15 and under, Hobby were under 9fpe but baracuda hunters were 13+fpe, it took me a while to get my head round it but i eventually worked on the stoke and dialled in Hobby shooting at the same power (near enough) and get this the high and low met in the middle...the 19gr come down to 11+ and the 12gr went up to 11+

This notion springers shoot lighter pellets more efficiently is due to poor design, not what springers can do. Im thinking an LGV in .22 with a DE spec piston will be quite the machine for this, if anything it may just need a few mm of stroke adding to equal things up at worse.

[brucegill]

you can tune springers to shoot heavy pellets more efficiently, this is done with stroke and transfer port, shorter stroke and so smaller TP to give a higher peak pressure and would you believe a springer starts acting like a PCP.

when i did that 25mm 80 you shot at the bash Bruce originally it was favouring 16 to 20gr pellets more than 15 and under, Hobby were under 9fpe but baracuda hunters were 13+fpe, it took me a while to get my head round it but i eventually worked on the stoke and dialled in Hobby shooting at the same power (near enough) and get this the high and low met in the middle...the 19gr come down to 11+ and the 12gr went up to 11+

This notion springers shoot lighter pellets more efficiently is due to poor design, not what springers can do. Im thinking an LGV in .22 with a DE spec piston will be quite the machine for this, if anything it may just need a few mm of stroke adding to equal things up at worse.

Some more great info! Many thanks Tony.

I have to to say, I did bloody love that .22 80!

[bigtoe01]

Some more great info! Many thanks Tony.

I have to to say, I did bloody love that .22 80!

well you can make your own when you get a nice lathe to do the bits on...there are a few places that carry the 30/25mm tube.

Or...why not try a HW95 with 23mm sleeve, so 85mm stroke 23mm piston have the cocking shoe push back on the piston skirt like on the LGV and make the piston rotate.

85mm stroke is 35CC or 80mm is 33CC (approx) plenty enough for 11fpe and the action has decent spring room

[brucegill]

well you can make your own when you get a nice lathe to do the bits on...there are a few places that carry the 30/25mm tube.

Or...why not try a HW95 with 23mm sleeve, so 85mm stroke 23mm piston have the cocking shoe push back on the piston skirt like on the LGV and make the piston rotate.

85mm stroke is 35CC or 80mm is 33CC (approx) plenty enough for 11fpe and the action has decent spring room

Thanks mate. Hopefully have another nice stock coming for an 80, so it will be on the cards!

I vaguely remember seeing you saying 25mm isn't the most efficient size. Not worked out how you've worked that out yet but now I'm starting to understand the SCR side of things, I'll do some calculations and see why. Well, hopefully lol.