Preload Washers

[Rez 4,961]

Stab in the dark here.

 

Does anyone know the power equivalent of the v-Mach preload washers? Does 1 washer equal 0.4 ft/lbs for example. I was asked at the club this evening and I didn't have an answer.

 

I understand that each set up is different, but again, wondered what your thoughts were.

 

Nice one.

[Coypu Hunter 486]

Stab in the dark here.

 

Does anyone know the power equivalent of the v-Mach preload washers? Does 1 washer equal 0.4 ft/lbs for example. I was asked at the club this evening and I didn't have an answer.

 

I understand that each set up is different, but again, wondered what your thoughts were.

 

Nice one.

 

In my .177 HW97K with FAC V-Mach kit fitted, they equate to 0.5 fpe each. I have two in at the moment, and the rifle is running bang on 13 fpe with JSB Exact Heavies. This will no doubt vary for different rifles/calibres.

 

If you add the second pair included with the kit, plus the thick nylon preload washer that fits over the spring guide, you should get up to 15-15.5 fpe. At that point, the rifle would be pretty difficult to shoot though; at 13 fpe the recoil is manageable, lock time is minimal, and it's deadly accurate out to 45 yards.

 

However, standard-weight pellets (8.6 grains) no longer group tightly, and I've had to move to Bisley Magnums (10.64 gr) and now JSB Heavies (10.34) to compensate for the higher velocities, which seem to destabilise the lighter pellets in flight.