The ability of the Marlin rifle to handle higher pressure loads has to do with it lock up.
On the Beartooth Shooters forum there are many threads on the .307 Winchester.
Seatlerdwr was one of several who had Marlin rifles rechambered for the .307 Winchester cartridge. The results were pretty uniform that the Matlin rifle would begin to exhibit sticky extraction about 150 fps short of the highest velocity loads in the Winchester rifles. This is not intended to disparage the Marlin, simp,y to report what we saw. Mr. Nonnuman converted Seatlerdwr rifles.
Seatlerdwr worked with Mr. Nonneman and developed a wildcat he named the. 30 Lever Maximum. This is a shortened .307/.308 Winchester with a slight Improved form. This rifle cartridge combination will handle the highest pressure loads with no indication of sticky extraction.
https://www.shootersforum.com/threads/the-30-lever-maximum.69457/#post-539992Mr. Nonneman is a real pro and developed a rather exiting rifle cartridge combination.
