I'm not sure about COAL as it didn't matter / wasn't alterable in this rifle. The two woodleigh bullets (soft and solid) have a crimp canaleur so the seat depth is fixed. The brass is under max OAL New from Bertram. I inserted tab A into slot B and called it a day.
The barrel is around 24" I think. A few things to keep in mind about .318wr.
1.) the published data is from two sources. Woodleigh manual and Graeme Wright's book.
2.) both sources are redundant and retreads of one another
3.) the data is wrought with errors and rounding...can't trust it.
4.) the original data from 1921 in Britain (Kynoch) is dubious. They lied as to original speed. They also used 26" and 28" barrels.
So, as to speed. The published 2400fps was never anything but fiction and then they used a long barrel to further the fiction.
A imr4350 load at 53gr at 2200fps regulates to the sights on the gun. Conclusion: FPS of the original load was in the same velocity neighborhood, not 200fps faster.
Not sure about the out to 160yds comment. Can you elaborate on your thinking? That 1900fps is important for a woodleigh soft? I find they work well down to 1400 in other rifles of different calibers.
At 325 yards it has the requisite 1500ft pounds of energy to bring down elk, Kudu, Eland, waterbuck, zebra, oryx. Inside 100 yards it's literally a laser beam by the drop tables. It appears to have the right stuff out to my maximum shooting range of 325 and it drops 10" at my comfortable shooting distance of 225 yards.
The other recipes I've seen are about 1gr more or less powder for H4350 and RL19. The case holds 69 grams of water so there is more room than pressure will alllow in most powders.