As an update, should anyone care, I've had some very positive looking groups with these 230 SMK 's loaded as follows:
RWS brass.
FEDERAL 215 primers.
67 5 grains of RL26.
94.9 OAL ( about 0.25 mm off of the rifling in my 1 in 8 twist Lothar Walther barrel).
A little under 1/2" groups at 120 yards under field conditions. I'm convinced they group better than this, but I wasn't shooting them under ideal conditions.
I've not chronographed them yet, but will do, and no, I don't shoot ladders, as I regard the exercise as pointless. I'll randomly work my way up to what I regard as my maximum load, using single shots, and achieving a rough zero in the process (in half grain increments in this calibre), then fire a four shot group, having already made the OAL close to touching the rifling. Check the group, and if its its got room for improvement I'll back off half a grain ( I only do jumps this big on a large capacity case like 300WM). Once the powder charge is optimum, I'll have a play with the overall length.
These look promising, and a BC of 0.8 is very beneficial. 😁