Marlin is offering their 1895 in 475 Linebaugh this year as the 1895-RL. 475 Linebaugh pressures run as high as 49,000 PSI's.

480 Ruger pressure run as high as 46,000 PSI's.

Remember the 475/480 is made with 45-70 brass so it has the same case head.

Does this mean the Marlin 45-70 would be safe up to 49,000 PSI's?

Does this mean our previous threshold level of 43,500 PSI is actually not the threshold but instead something quite safe?

Or did Marlin change or modify the 1895-RL receiver to accomodate the higher pressures?



Or am I missing something?



David

In the past they'd offered the 336 in .375 Winchester and .356 Winchester with no reported pressure problems. Both of those rounds are rated at 52,000 CUP.

I've heard rumors that those guns underwent some sort of "special" heat treating process, but many will argue that is a myth.

Anybody know what the equivalent CUP is to 49,000 PSI?

I have read there is no direct conversion as cup has to many variables but as a rough guess 40000-45000 cup

I have heard the heat treatment theory before, but I can't see how different heat treatment processes for the same rifle would be economical. And why wouldn't they heat treat all of their 1895's the same (the strongest finished product possible) to avoid possible liability issues.

I don't know whether to believe the heat treatment theory or not. But I suppose it could be true.

David