FWB Sledge vs Giss question?

[Geezer]

Its certainly due to the cost factor. Also the fact that a similarly powered Giss rifle would have to be very long indeed.

I don’t think the Giss system would be practical at 12, let alone 20. As you know, Giss only uses the forward piston to propel the pellet. More powerful twin-piston designs (Whiscombe, Park) use both.

[T 20]

I don’t think the Giss system would be practical at 12, let alone 20. As you know, Giss only uses the forward piston to propel the pellet. More powerful twin-piston designs (Whiscombe, Park) use both.

The original Giss patent had the Pistons travelling towards each other, this is said to be where John Whiscombe got his inspiration from. :-

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All the best Mick

[airgunwerks]

I have shot and rebuilt literally hundreds of both over the last 39 years and a serviced Feinwerkbau will always outshoot the 75 in a experts hands, if either is neglected the FWB will survive but if the 75 is shot with bad seals the teeth on the rear of the pistons will break off and you may end up with a door stop. Build quality on the Feinwerkbau is superior in every aspect.

[dvd]

I have shot and rebuilt literally hundreds of both over the last 39 years and a serviced Feinwerkbau will always outshoot the 75 in a experts hands, if either is neglected the FWB will survive but if the 75 is shot with bad seals the teeth on the rear of the pistons will break off and you may end up with a door stop. Build quality on the Feinwerkbau is superior in every aspect.

That's true since serviceability and simplicity are very important when competing at the top level.That, and having a production facility focussed on precision airguns, goes a long way to convincing users that they have the best product to compete with.
My FWB 300 buzzes slightly and I could easily fix that but it's accuracy is still astounding, so I leave that alone because it's not too detrimental to the gun. That's the effect of simplicity in design.
I agree that the Achilles's heel of the 75 is the seal, when that goes out of spec, the timing goes off and the idler gears become loaded, leading to unbalanced forces and problems.
Having said that, one of the best party tricks I love to do with the Diana 75 is to stack 5 flathead pellets on top of each other on the action and pull the trigger. They stay put
There's nothing like a well fettled Giss action subduing a springer.
Perhaps the other closest and more equitable competitor to the FWB 300 is the Anschutz 380, which also utilises the sliding action mechanism, but inside a fixed action. That is another marvel of engineering.

[Ian Cartmell]

I’m currently shooting a 300s and 65 in a 66 stock out to 25 yds.
Both scoped although the results with a diopter are almost as good.
The 65 just edges it in my hands for consistent grouping, zero recoil as opposed to the very slight nudge of the 300.
Over 10 metres or 6yd bell with a diopter I once again find the 65 to be more consistently accurate in my hands
This is only my findings but the 300 is my favourite to shoot.