Have you rechambered a Marlin 336, 30-30 to a 307

[mrknox]

I am new here. I have been looking for someone who has done a rechamber on a Marlin 336 30-30 to a 307. There always seems to be someone who knows someone whos done it, but I need some facts. Has anybody done this and tested it with a stock gun? I am very interested in what you have to say about it so please inform me.
As far as ammo goes you can still buy it online. I have purchased eight boxes in the last week, five of which are 150 gr. Not sure if I should use them or save them, as they do not make the 150 anymore. Winchester informed me that they still make the 180 gr, but its more seasonal and you my have to order it threw a dealer.

But I really need some facts on the 336 rechamber. Or if you could lead me to someone who has some.

Thank you very much.

knox

[PJgunner]

Well, Marlin did make some in .356 Win., but held off on the .307 due to problems, then decided to not make any chambered to that cartridge. In that light, I would have to figure that maybe it's not a good idea.
Paul B.

[RugerNo3]

There is a gentleman that posts as Slim Iorg over at Beartooth Bullets dot com that has done and is currently doing extensive tests with pressure controls on the 30-30. He also has a 307 Big Bore that he has run tests on. His findings are that the 307 is erratic on pressures. The 356 win follows some normally accepted patterns in load development, but not so with the 307. Remember, for whatever reason Marlin didn't produce this chambering for retail. His tests are run using the case expansion guidelines of miking the pressure ring at the web and running all loads to within .0001" constants. It is interesting to note that the 30-30wcf runs higher velocities from a 26in barrel then the 30-30 AI version runs from a 20 inch carbine loaded to the same pressures. His feelings are the 307 in a Marlin is on the ragged edge of the built in safety factor of that levergun design. Headspace will start increasing at a faster rate then is desirable.
I would suggest that you visit Beartooth and run some search on his posts. On one post he alluded to a 150gr at 2400 from his 307 Win 20" and that is attainable with a 30-30 in a 26in barrel. Of what value is a rechambered Marlin? That is up to you to decide.