Falling Block 338 Norma Single Shot Rifle

[Bubba Boomstick]

I worked with the 338-300PRC when Hornady and Accuracy International submitted it to the military. It doesn't have the capacity to launch 300's but for 250's it would be fine.
I have reamers and dies.

I will have to look into that and see how all the H2O capacities compare. Very interesting! Is it just a simple neck up process with an expander mandrel?

 

[DaveTooley]

I will have to look into that and see how all the H2O capacities compare. Very interesting! Is it just a simple neck up process with an expander mandrel?

Yes that's all that's required

 

[Bubba Boomstick]

Yes that's all that's required

Are there differences between the 338-375 Ruger and the 338-300 PRC?

 

[Bubba Boomstick]

If you really want to do this, a serious sit down with numbers and metallurgy would be worth while.

Original Highwalls were chambered in many 50 caliber cartridges and a couple .577’s. Of course black powder. But consider the modern Miroku built Low Walls easily handle 60,000 PSI when the originals are questionable with smokeless pistol loads.

Some of the Winchester black powder cartridge rifle barrels were 1”-32 threads, whether you could re-thread an existing action to a 1 1/16th tenon could be worth looking into. I thinknthe action width is 1 5/16

Last thought would be, consider that the Browning B-78 was sold chambered in 7mm magnum. Base above the belt is .510”(?)

Thank you for your insight. It would be beneficial to me to have a falling block made in the past 50 years. More so after the year 2000 just to be sure I am staying on the safe side of metallurgy and action strength. Probably avoid a black powder conversion to smokeless cartridge.

Best bet might be to get a Modern 1885 chambered for 300 WSM / 325 WSM. 300 WSM is 63,000 PSI. Sounds like it should cover a wildcat 338 based on the 375 Ruger. Or I can go with the Ruger No.1 in a magnum bolt face and go from there since they have a larger tenon.