I'll have to dig out the old D13s to look.
I have far more D24s as I prefer the big kick of BT propellant in 18, 24, and 29mm flavors.
BT ages well and does not swell.
Wish we could get their Mohave Green propellant in some 18mm and 24mm loads.

__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !