Which mold for a Marlin 336 30-30 micro groove?

[MarkP]

RCBS 30-150 Cowboy. Its a plain base design thaylt shoots well in my 30-30's both Winchesters and Marlins (micro grooves)

[smkummer]

I got him talked into Lee’s C309-170-F with Sage gas checks.

[smkummer]

So the above Lee 170 grain gas check mold seated where the crimping groove is located won’t chamber as the micro groove rifling is engaging the forward ogive of the bullet. Sure seems odd that a design for the 30-30 can’t be seated in the crimping groove where intended? Out of spec mold? I’ll tell him to call Lee and see what they say.

[Jeff Michel]

if you can find one, 311440.

https://www.accuratemolds.com/bullet...bullet=31-150L

[imashooter2]

My C309-150-F engraves rifling too. The lever closes just fine and the boolits don’t pull if I want to unload it without firing.

[RickinTN]

Engaging the rifling is a good thing if it doesn't interfere with the bolt closing or removing a loaded round. It contributes to accuracy.
Good Luck,
Rick

[Griff]

So the above Lee 170 grain gas check mold seated where the crimping groove is located won’t chamber as the micro groove rifling is engaging the forward ogive of the bullet. Sure seems odd that a design for the 30-30 can’t be seated in the crimping groove where intended? Out of spec mold? I’ll tell him to call Lee and see what they say.

My C309-150-F engraves rifling too. The lever closes just fine and the boolits don’t pull if I want to unload it without firing.

What length are you trimming your brass to? I trim all mine to 2.028" and have no issues feeding & chambering in multiple rifles. I even trim new brass as it is often inconsistent in length.

[ChuckJaxFL]

Engaging the rifling is a good thing if it doesn't interfere with the bolt closing or removing a loaded round. It contributes to accuracy.
Good Luck,
Rick

I just took possession of one of the new Ruger 336SBL’s. I’ve only had it to the range for one trip and have only tried a few starting loads. This is the NOE 312-151-RN, powder coated & sized to .311.

I can feel some slight resistance closing the lever, and quite a bit extracting the unfired round. I’ll try a few more traditionally lubed, and some with good old Alox. The first rounds showed promise, accuracy wise. But I’m concerned about chamber pressure. If other-than-powder coated bullets don’t chamber/extract easier, I’m going to abandon trying to pair this bullet with this rifle.


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[scattershot]

[ATTACH=CONFIG]326174[/ATTACH This is with the Hunter Supply 165 grain bullet, but there are molds available for it, too. Marlin 336, Micro Groove barrel.

[RickinTN]

I just took possession of one of the new Ruger 336SBL’s. I’ve only had it to the range for one trip and have only tried a few starting loads. This is the NOE 312-151-RN, powder coated & sized to .311.

I can feel some slight resistance closing the lever, and quite a bit extracting the unfired round. I’ll try a few more traditionally lubed, and some with good old Alox. The first rounds showed promise, accuracy wise. But I’m concerned about chamber pressure. If other-than-powder coated bullets don’t chamber/extract easier, I’m going to abandon trying to pair this bullet with this rifle.


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I don't think there is any worry about chamber pressure from the engraving in your picture. Lead, even hard alloys are soft. If you were talking about then same situation with a jacketed bullet then there would probably be reason for concern but then again a jacketed bullet wouldn't chamber if it were the same diameter on the nose. Of course, as always, start with a reasonable powder charge and work up or down as indicated. In a 30-30 and a Marlin lever rifle if you actually see any traditional pressure signs you are well over the strength capabilities of the rifle.
Good Luck,
Rick

[Bazoo]

My friend's 336 does well with my handloads using the Lyman 31141 sized to .310, lubed with White Label 50/50, and loaded at full pressure. We shot some on paper, and I don't remember specifically the group size, but it was acceptable and in line with the factory ammo we shot.