walther classus power level

[miller]

Hi all just got a brand fire new classus in .177 bought as full power but only doing 10ft lbs,any body else found this. very happy with gun in general just a but concerned about about low power.
Cheers Pete.

[deejayuu]

What pellet are you using?

[cooper_dan]

Some guns will have fairly tight piston seals from new. It will probably take a few hundred shots to bed it in a bit, and the power should creep up. Also different pellets will give different power. Try checking a few

[miller]

Put couple of hundred exacts through her up to now ,stripped her down the other day and piston seemed quite loose although I understand that under acceleration seal will probably open.

[rabbitwrecker]

Put couple of hundred exacts through her up to now ,stripped her down the other day and piston seemed quite loose although I understand that under acceleration seal will probably open.

JSB Exact are a little on the heavy side for a sub-12 ft/lb springer - try the lighter JSB RS and/or Express...

[PhatMan]

miller,

Give the rifle a little time to bed (500 pellets or so) in then re-chrono.

There is nothing wrong with 10 ft.lb

I have recently adjusted my ultra-short stroked 0.177 TX200 from 10.8 to 10 ft.lb, and it shoots sublimely at the lower level.

+1 on the JSB Express : for most of my springers, the JSB Express are the pellet of choice, giving the best and most consistent grouping out to 50 meters.

Have a peek on Chairgun, and you will see there is very little trajectory difference between a 10 & 11 ft.lb rifle.

(in 0.177, using JSB Express, there is a 1/2 inch difference at 50 meters !)

As a general default, I try to set the target output of my springers to 10.5 ft.lb, and am now experimenting with 10 ft.lb.

So far, I have found no downsides with the TX at 10 ft.lb. - benefits are reduced cocking effort, and sweeter shot cycle.

(I always try and make sure the rifle is 'balanced' at these output levels)

Have fun & a good weekend

Best regards

Russ

[miller]

Cheers Russ gun will probably nudge up a bit with 7.9s anyway. Will let it run in for a while ,firing cycle is sweet.

[piggy589]

For whatever reason accupel at 7.9grains give increased velocities in most guns I've tried them in.

[Alakar]

If the Classus is similar to the Terrus that I own , it needs a little time .
I'm getting 11.4 using JSB Exacts 8.44gr
I have done a little polish and put in a sleeve .
The firing cycle is very smooth.