I thought this might interest some members here. I recently got for my use 4 different case sizing dies used at VKT factory in late 1930's for manual manufacturing of very small series of cases for experimental guns. Based on information from drawings and and some existing cases I made a set of reproductions. Raw cases were turned in a lathe from solid brass bar, as originally and then sized in dies.
From left they are:
-20x75B. No idea when made and for which gun. I know one original case which has no headstamps. The die also was unmarked.
-20x81. Die is marked L-38 which was one of the prototype airplane cannons. I have one original case dated 1938.
-20x98,5B. Die is marked L-37 which also was one of the prototypes never made in series. I have one original case without headstamps.
-15x109,5B. Here I have only imagined the head design and total length, this may as well be a non-belted case. 15mm guns were never made in Finland, a 15mm ATMG L-34 was on drawing board but never made. A drawing of it's case and projectile have survived but dimensions do not match with this. The die is marked ( translated from Finnish ) "15mm E-case". Further according to neck outside diameter projectile diameter is 15,5mm .
All case heads are permanently marked so that one day these may not continue their life as "original".
From left they are:
-20x75B. No idea when made and for which gun. I know one original case which has no headstamps. The die also was unmarked.
-20x81. Die is marked L-38 which was one of the prototype airplane cannons. I have one original case dated 1938.
-20x98,5B. Die is marked L-37 which also was one of the prototypes never made in series. I have one original case without headstamps.
-15x109,5B. Here I have only imagined the head design and total length, this may as well be a non-belted case. 15mm guns were never made in Finland, a 15mm ATMG L-34 was on drawing board but never made. A drawing of it's case and projectile have survived but dimensions do not match with this. The die is marked ( translated from Finnish ) "15mm E-case". Further according to neck outside diameter projectile diameter is 15,5mm .
All case heads are permanently marked so that one day these may not continue their life as "original".