Thank you everyone for your input.

Dealing with things in the order of your responses:

@DC31k

(1) The ogive is not supercritical and can probably be half an ellipse provided the TL and CL are correct

(2) On the RHS (in green)

TL= Total Length measured from the base (= Ogive + Case)

CL = Case Length measured from the base (the Case, being the whole section below the Ogive)

HL = not sure what it stands for but it is the height from the base to the straight part of the Case and so includes the Rim, Groove, and 45 degree section between the straight part of the Case and the Groove

GW = not sure what it stands for but it is the height of the Groove (i.e. between the Rim and the 45 degree section)

RT = not sure what it stands for but it is the height if the Rim

On the LHS (in red)

B = Bullet diameter (i.e the widest part of the ogive section)

M = Mouth diameter (i.e the Case at the top)

H = not sure what it stands for but it is the diameter of the case immediately above the 45  degree section

G = Groove diameter

R – Rim diameter

(3) Can be to nearest lower 0.1mm

(4) Zero blend is not essential

@duncanwebster1

(1) If someone could produce a CAD drawing that would be fantastic

(2) See above on the RHS dimensions

@petercook6

Unfortunately the 7.65mm Browning (aka .32 ACP) has too long a case length, too wide a rim and too shallow a groove. These solid brass dummy shells are intended to be able to fit in the obsolete pistols chambered for them (Roth Sauer and Roth Steyr pistols) to display how they function and operate without having to use original bullets (with all the problems that might involve)