[NFG]

Square thread to "V" thread, dates and calibers.

Still trying to get to where I want to go...maybe this question will provide some answers.

Can anyone supply the approximate dates and/or caliber/models when Marlin changed to "V" threads?

I know the 450 Marlin has "V" threads and Fireball helped with the 45-70 XLR, Wikipedia has some information, but I can't seem to pinpoint anything specific. Marlin doesn't have a phone/email contact info so SOMEONE surely knows this for certain on the WWW.

Thanks

 

[Leverdude]

Re: Square thread to "V" thread, dates and calibers.

the ONLY Marlins with "V" threads are the .450, the 308MX & 338MX. I guess date wise you could go with the introduction of the .450 because it was the first of those three.

 

[NFG]

Re: Square thread to "V" thread, dates and calibers.

Thanks...that's even better...dates don't matter if there is an "only" in there.

Can you tell me what the differences are between the 45-70 and 450 M bolts and carriers...if any?

 

[Leverdude]

Re: Square thread to "V" thread, dates and calibers.

Thanks...that's even better...dates don't matter if there is an "only" in there.

Can you tell me what the differences are between the 45-70 and 450 M bolts and carriers...if any?

The carriers are probably the same but the 450 bolt will have a different face than the 45/70 with its big rim. What are you thinking of doing?

 

[Halwg]

Re: Square thread to "V" thread, dates and calibers.

The carriers are probably the same but the 450 bolt will have a different face than the 45/70 with its big rim. What are you thinking of doing?

I'm wondering that, too, because it could get ugly!

 

[NFG]

Re: Square thread to "V" thread, dates and calibers.

35-284 OR 416-284?? Have you looked at that thread? All of what I'm trying to do is covered there, at least most of it. I'm having to back into this thing because direct questions seem to blow right on by.

I need the thread pitch for the 450 M so I can calculate thread depth and compare that to the 45-70 square thread depths and 45-70 vs 450 M barrel dimensions, so I can determine the amount of the metal left underneath the minor thread dia for the OD of the case I'm thinking about using and if it leaves enough metal to be safe.

There is the 45 Alaskan which by one "authority" says is just a rechamber without any other modifications to the receiver threads...not for me thank you very much, Mic McPherson does some work on the threads, Wild West Guns has their iteration and I've asked them back in 2008 or so, but didn't get much more than boilerplate. There is also the RCM case that is used, but I can't get specific information on WHICH receiver is used...the square threaded one or the "V" threaded one.

The problem being I'm getting lots of good information but it is scattered and piecemeal. I'm probably not asking the right questions for the specific information at the right time.

I'm also getting opinions and not specifics which isn't helpful.

Alternatively I have to back door this by asking about bolts and carriers, barrel OD's, etc.

Straight up, I need the information so I can do a 35, 375 or 416 cal rebarrel/rechamber to my 336. I need the SPECIFIC information about the 45-70 and 450 M bolts, and a picture of both bolts side by side would help immensly or at least a measurement of the 450 M boltface and whether the 45-70 has a recess or is flat without a rim.

My 30-30 to 356 conversion was just a barrel swap from Jes Rebore...it uses the same bolt without any mods but I can fit a 375 H&H mag case in the boltface recess, it's a tight fit and should be opened a bit more..

I've hit 3 different levergun forums trying to piecemeal the specific information with some success.

I've pretty much settled on doing a 375-284, but I still want the information in case I decide to do a 416 RCM.

Thanks for any input.

LUCK