nein nein mein boots, das 5.45x39 ist nicht based on 7.62x39 (how was that for an impersonation of an east german border guard?)

for bolt head, take a 223 bolt had and mill it out a bit?
problem will be finding a barrel

What barrel was your smith going to buy?


I have a few bookmarks from the my days of day dreaming of a bolt in the same caliber.

here are some specs:
Bullet diameter 5.60 mm (0.220 in)

Neck diameter 6.29 mm (0.248 in)

Shoulder diameter 9.25 mm (0.364 in)

Base diameter 10.0 mm (0.394 in)

Rim diameter 10.0 mm (0.394 in)

Rim thickness 1.50 mm (0.059 in)

Case length 39.82 mm (1.568 in)

Overall length 57.00 mm (2.244 in)

Rifling twist 255 mm (1 in 10 in)

Primer type Berdan, small rifle

Maximum pressure 380.0 MPa (55,114 psi)