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Old April 5th, 2020, 02:00 PM #1
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Mold for 300blk

OK,
My 309 Lee 160grn mold seems to be no good for 300 blk
https://leeprecision.com/mold-dc-c309-160-r.html

Maybe its the HiTek coating is not tough enough or maybe the bullet seating but it gets gouged when I load a round in my 300BLK.

I'm going to try traditional powder coating but I"m also looking to get a mold a better mold more suitable for 300blk.

What are you guys using and what kind of smokeless powder?
It would be nice if I could do subsonic with it.
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Old April 5th, 2020, 02:40 PM #2
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I'm not a Lee person but getting a Lee Expander/flaring die will flair the end of the neck and make seating cast bullets /oversize bullets easier.
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Old April 5th, 2020, 02:52 PM #3
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Yes cast/PC boolits need about twice the case mouth flare to get the seating started
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Old April 5th, 2020, 02:57 PM #4
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Mold for 300blk

Just to be clear
Problem is when charging the chamber of the rifle with a round
I was testing loading an unprimed and uncharged round into the AR
These had gas checks and no problems seating the bullet

When I googled around saw no one using this mold in 300blk


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Old April 5th, 2020, 03:15 PM #5
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Lees 230 grain boat tail was designed for 300 blackout.
Are they chamber marks or land & groove marks?
I would change to the 230's if I was to go subsonic.. Lots of load data out on the web.


Personally I would shoot what you have and see how well they shoot.
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Old April 5th, 2020, 05:18 PM #6
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I was eyeballing the Lee 230gr mold.
Iíd like to mold up a bunch of what ever I end up with while sheltered in place as I donít think Iíll have a chance to shoot for a while.


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Old April 5th, 2020, 05:21 PM #7
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Quote:
Originally Posted by Melnic View Post
OK,
My 309 Lee 160grn mold seems to be no good for 300 blk
https://leeprecision.com/mold-dc-c309-160-r.html

Maybe its the HiTek coating is not tough enough or maybe the bullet seating but it gets gouged when I load a round in my 300BLK.

I'm going to try traditional powder coating but I"m also looking to get a mold a better mold more suitable for 300blk.

What are you guys using and what kind of smokeless powder?
It would be nice if I could do subsonic with it.
Kinda light for subsonic. I wouldn't go lower than 180gr and I'm a big fan of 200+ grain projectiles. I load all my 300blk subs with Accurate 1680. I've tried all the others and this has been a solid, consistent performer throughout. I use hotter primers as well. Rem. 7.5 BR

It gets gouged when loading a cartridge or loading into your gun? As Postell suggested, you need to flare the cases when loading lead pills, no matter the coating.
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Old April 5th, 2020, 05:23 PM #8
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Quote:
Originally Posted by Melnic View Post
OK,
My 309 Lee 160grn mold seems to be no good for 300 blk
https://leeprecision.com/mold-dc-c309-160-r.html

Maybe its the HiTek coating is not tough enough or maybe the bullet seating but it gets gouged when I load a round in my 300BLK.

I'm going to try traditional powder coating but I"m also looking to get a mold a better mold more suitable for 300blk.

What are you guys using and what kind of smokeless powder?
It would be nice if I could do subsonic with it.
I have shot thousands of that bullet both with traditional lube and PC. It's a great bullet for the 300 BO. I am using 17.0 grains of H110 and my barrel twist is 1 in 8.

For subsonic, most folks use the 230 bullets and a 1 in 7 twist.
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Last edited by John from MD; April 5th, 2020 at 05:26 PM. Reason: typo
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Old April 5th, 2020, 05:59 PM #9
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Mold for 300blk

John
What OAL did you use?
I do have enough H110 to make up a test batch to shoot and up to 120 rounds


Outrider, per post #4 when loading chamber of the rifle
See pic below (exposed lead on left side).

Lead hardness is about 10-12


I think I have a die I can use to add a flair for seating easier




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Old April 5th, 2020, 06:10 PM #10
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Quote:
Originally Posted by Melnic View Post
John
What OAL did you use?
I do have enough H110 to make up a test batch to shoot and up to 120 rounds


Outrider, per post #4 when loading chamber of the rifle
See pic below (exposed lead on left side).

Lead hardness is about 10-12


I think I have a die I can use to add a flair for seating easier




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I use Dillon funnel/flare in my 550 and the Lee Factory crimper on the final stage.

I don't cast bullets so probably John would be a bigger help as far as lead malleability is concerned.
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