Dave any custom action will no doubt be stiff enough for the calibers we are allowed to shoot in a fly match given the range templates.
My personal preference is a duel port action with a right bolt left feed right eject but would not hesitate to buy the advertised action drop port action if the intended caliber will freely drop through that port.
The idea is to be able to use both hands to run your shots down relatively quickly if a condition holds.
As for the action still being there for sale is probably just that no one is currently building a rifle ( i would personally buy it if it wouldn't mean id get a divorce ) ...
I know what you mean regarding the wife..... When she said we should get a CF for 500 Fly I dont think she meant next week!
As we know it takes time for builds to be completed, always seem to be waiting on something to arrive that holds up the build. I am going to make the trip down to Little River so will have a chance to learn some more.
I have been scracthing my head to the cost of some of these actions here is Australia, the price for a top action is about $1200 in the USA but over here its $2600 or $2700 - I know the A$ is bad at .67c to the $US but that is big mark-up for something that will fit in a post pack. Remember gunsmiths\shops would not paying retail if making a large order so would be getting a trade discount.
i love my dual port stolle panda, you have the best of both worlds , can feed from the left and use RH bolt RH eject when on bench to rattle them quickly in the right conditions, also you move your head less/break body position compared to feeding RH imo (especially when you need to see where the case is if it didn't eject, dual port i just push the case out with new round if it didn't come out)
but when i do the odd F class i can still load from the RH side while your laying down prone
the actions are stiff and you wont get any movement and you save a little bit of weight
after using the dual port i doubt i will ever go back to RH feed especially on bench
like you i did look at LH feed RH bolt and drop port and dual port with a drop port but the wait for it was longer than i was willing to do
The question in relation to dual ports single ports RBLP LPRB is really down to the way you want to shoot the rifle. The stiffness of the action is dependent the quality of the action and what are you going to chamber it in.
As an example i wouldn't be shooting a 260 AI 140 gn big charge out of a standard rem action and expect to be in the winners circle, sure they will stand up to the recoil but more importantly is the harmonics of the rifle.
Like barrel tuning with a Rimfire which you know about a centre is the same principle with a centre fire but instead of tuning the rifle to the load you are tuning the load to the rifle.
Now to the actions i personally like the left feed right eject action for speed and stability of the rifle in the bag i can stay on the rifle sighted and shoot the five shots of in under 20 seconds if need be so that means I have 6min 40secs to decide when to shoot the scoring shots. Hope this makes some sense.
shooting well is more a mental control of your thoughts than just pulling the trigger........