"Clearly you have made up your mind, go for it. Your profile indicates you are a PH, yes?"
Yes I am. I have seen numerous failures with Woodleighs in non NE calibers. When used on DG. I have stopped enough Cape buffalo, Elephant and Lion to know they are not for me and I share that experience when fellow AfricaHunting guy's ask. I use Rhino bullets for all my DG back-up work.
"But by claiming that an entire brand of projectile is completely useless because of your limited experience suggests a deeper seated prejudice that you might want to get help with."
??? I never claimed this!!
I have repeatedly said they are too soft for use on DG, especially Cape buffalo when using non NE cartridges. When used on soft skinned game and traditional NE cartridges in doubles they work better.
"
There are plenty of people with experience of success and failure with any and every brand of bullet everywhere."
So there are, however I don't see people with negative feedback regarding Rhino solid shank, North Fork or Swift A frame bullets used on DG when compared to Woodleigh.
"None of which helps the original poster on this thread, but I'm sure he'll pretty quickly work out what does and doesn't work for him - from his own experience."
I fail to see how feedback from experienced people regarding bullet selection does not help the OP. I am sure he would not like to find out on his DG hunt in Africa that his chosen bullet failed!
We are talking 416 Rigby in a Sabatti double, possibly regulated for a 400gr bullet @ 2415 fps, for use on DG(Cape Buffalo). He needs a bullet of 400gr at about the same velocity to get it to regulate, the Woodleigh in my opinion is not the bullet for that.
Right Im thinking about getting some woodies for the 416 rigby. But how much truth is there about the impact velocity recommendations?? Also how well do they perform? They must be rather good otherwise Norma wouldn't use them.
To answer your original 3 questions:
1. I believe the impact velocity recommendations are not correct in some DG calibers. In particular 300gr 375 H&H and 400gr 416 Rigby.
2.They perform well in original double rifle NE calibers which operate at lower velocities. They are the closest available to the original Kynoch bullets that were for years the only ammo available for double rifles.
At higher velocities(OP original 416 Rigby), the performance is not so good.
3. Yes they are good enough for Norma and as loaded in the African PH range they are excellent. However the PH range is loaded with the heavy for caliber bullets at modest velocity.
For the 416 Rigby in question the PH range is loaded with a 450 gr Woodleigh with a modest velocity of 2150 fps. So to not perform at that velocity and weigh it will have to be made from lead only. One small problem for the OP is he has a double rifle regulated for 400gr bullets, so the PH range is unfortunately not an option for him.
The OP is welcome to disregard my advice and experience, each person makes their own choices.