Reeder Custom Guns - 400 GNR

I'm thinking about having a Marlin 336 rebarrelled to 400 GNR.

How well-matched is the 400 GNR with a lever gun? In practice, is the straight-wall a problem in cycling? Do the commonly available JSP/JHP 10mm/40 bullets hold up at rifle velocities?

How about forming brass? Best to start with 30-30? 38-55? 375 Win?

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Gary's .30 GNR is a heck of a round for a pretty easy rechamber. It gives .300 Savage performance and can still shoot factory .30-30. I also like the idea of his .35 on the .30-30. Easy brass and top .358 cal. performance. More bullet selection that the .400.

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I have a 358 GNR Contender barrel and love it. It is especially good with Nosler 200gr Accubond. You can fire form with 30-30 factory loads.

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It seems to me the reamer would clean up all of the old .35 Rem. There are lots of .35 Rem. contender barrels out there. I love the Marlin 336 in .35 Rem. but there are extraction issues that arise from being rimless. A lever gun simply NEEDS a good rim on the case.

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In 35 Remington and none from the 50’s to the 90’s had an extraction issue.

I’m sure you will be quite happy with a 400 GNR. What I want is a T4 necked to 410.

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It was some odd hand loading that manifested the extraction rim jumping. Have you examined the extractor on a 336? Stamped POS, circular spring that snaps on the end of the bolt. A wonder it works at all. The ejector is a glorified Bobby-pin. Again shocking that it has functioned all these years. It is just sort of stuck in the receiver, captive by the bolt. Remove the bolt and it simply falls out.

But some how they DO function.

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is only a warped piece of spring steel. They work fine and outlast many owners.

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Come to think of it I had some 220 grain WFN that you had to man handle the finger lever to extract.

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The 35 Rem is fatter at the base by about 30 thou. so the 355 GNR won't clean up the 35 Rem chamber.

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it is on the 30-30 case while the 358 GNR is based on the 445 case.

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like Alcorn says below it can be made simply by fire forming the 30-30 in the 355 chamber. It gives you considerably more
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The 400 GNR is also a good one but you can have some problems with 10mm bullets with no cannelure. On recoil they can slip down into the case. You have to put a good strong taper crimp on the bullet as it is so slick.
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but in my experience .375 Win is your best bet for making .400 GNRs. 5 years ago you had to scrounge for brass and it was insanely expensive; now Starline makes it cheap. https://www.starlinebrass.com/375-win

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400 GNR - Lever action

While I like the .400 since you're already .308

358 GNR

Will that work on a .35 Rem. rechamber?

WB I’ve had at least 20 Marlin’s

I’ve only had (3) .35 336’s. Factory ammo was fine

Same exact ejector on a Win. M1912. A Mossberg 500

WB yeah those parts look cheap

it won't clean up the 35 Rem. chamber

I think Alcorn is talking about the 355 GNR as

Yes 355 GNR

of the calibers mentioned my favorite is the 355 GNR

Late to the party