9.3 X 57 Cutting down barrel from 24 to 20 inches. Velocity and performance loss?

[anglia2]

few decades ago a french magazine did a test with 3 calibers 7x64, 300 win mag and the 9.3x62 and checking speed after barrel cut and factory ammo. the 9.3x62 was the only one in that test that gain after a reduction of 5 and 10cms.

so you may be surprise of the outcome with the potato thrower (nickname in Scandinavia of the 9.3x57 ..)

I seem to remember a similar test that John Barnsness did in Rifle/Handloader a few years back . If I remember correctly ( iffy ) he had the same results with a 9.3x62 , I'll see if I can dig up the article and post the contents .

 

[anglia2]

I have one about to be bobbed from 23 5/8 to 20 inches. Will report back before and after.

Ted

Excellent , I'm contemplating doing the same to mine , but I'd rather wait and see some real numbers before I do .

 

[Ardent]

I think the 9.3x57’s losses could be as low as 10-15fps per inch, it may even be equal at both lengths. A cartridge like that has already extracted nearly everything from the powder by 20”, good sized bore and small powder charge to burn in it.

 

[Gatehouse]

24" on that cartridge is a waste of 4" of barrel. I would be running, not walking to chop that thing down.

 

[hoytcanon]

I think the 9.3x57’s losses could be as low as 10-15fps per inch, it may even be equal at both lengths. A cartridge like that has already extracted nearly everything from the powder by 20”, good sized bore and small powder charge to burn in it.

24" on that cartridge is a waste of 4" of barrel. I would be running, not walking to chop that thing down.

Agreed...

 

[todbartell]

Quickload predicts 21 fps per inch

 

[pacobillie]

Quickload predicts 21 fps per inch

does Quick Load agree with my estimated velocity (see Post #1)