I have a Vz-24 JC light weight model, in 7 x57mm with an interesting history. A batch of 15,000 Bruno Vz-24s were being made for the Southern Chinese Army in 1929.
The Chinese could not pay so Bruno's broker went looking for anotehr customer. They found a nice rebellion going on in Brazil. There was a group calling themselves the Constitutionalist who were trying to oppose the Brazilian dictator.
Anyway,,, the rebels in Sao Paulo Brazil bought the rifles, which were re-barreled to 7x57mm. Unfortunately for them, they lost their rebellion around the end of 1930. About when the rifles showed up. As a result these commercially marked Vz-24s ended up being taken by the Government forces. Thus the second serial number on the right side of the receiver.
I cleaned it up and the barrel is not too badly pitted, but the rifling is fairly shallow. Originally it shot HUGE groups. Like 20 inch across.
So I re-crowned the barrel since there was a huge ding that went down into the rifling. .
This seems to have helped some, but long boat-tails and a couple other bullets are still unstable. In fact the 175 grain Sierra boat-tails start to key-hole at very close range.
So I was wondering if anyone has tried cast lead bullets at moderate pressures with a shot-out bore?
Anyone have a few cast lead and lubed 7mm bullets they would like to sell so I can see if it works????