Marlin have selectively used V threads in place of Acme threads in 336 models chambered for their proprietary high pressure rounds, eg 450M, 338ME and 308ME. I am not certain but I don't think they used the V threads when they chambered the 336 for the 375W, 356Win or 307Win. There were rumours that they had pressure problems with the 307Win and either never released that chambering or quickly dropped it from their line up.
If you can find a donor 336 with a V thread that would be preferable but the normal 336 action would be fine as long as you keep pressures to sensible levels. One other point with a 336 is that it will feed rimless cases. An easy conversion is to have the chamber of a 336 in 35Rem opened up to take a 358Win (loaded to 356 Win specs).
Last edited by JFE; 01/04/19.
