Yes or no?
Yes or no?
I think 425 grains would be the place to start for single hand spey casting with a scandi head...
I fish a 360 grain scandi head on a 8 wt. 10 ft. single hander and I love the way it casts and fishes using single hand spey technique.
A good rule of thumb is to select a line three wts lighter than the spey designation for single hand spey casting.
Hope this helps...
any rod can throw a line.
you can make a willow stick throw a line.
the real question is whether the tapper is designed to do what your asking it to do.
It will do something, but probably not as effective as it could be.
go on line and look at a spey tapper that has been measured out compared to a dry fly rod... you'll see a big difference.
the worst that will happen is you'll probably blow up the female side of ferrule station on the mid section or blow the tip off. its the torque...
honestly for the time and energy messing with the lines... you could just buy an intro Rainshadow switch rod kit and build it for $150. and it would take you a couple of weekends...
We have demo Scandi heads in many sizes that you can try Doug.....
I think you will need at least 400 grains.
The Steve Jensen Group
Kiene's Fly Shop - Sacramento, CA
Grizzly Hackle Fly Shop - Missoula, MT
Marriott's Fly Shop - Fulerton, CA
Semi-retired in Davis, CA and Sebastian, FL
When I tried using an 8wt. instead of a 10 (I have both) for a double spey with a 300 grain scandi, it flexed far more than I was comfortable with.
All casters feel different "messages" from within the capacity of any given rod...
You should pursue whatever "guidelines" you feel are appropriate...
Godspeed on your journey!