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Old September 2nd, 2020, 04:21 PM #1
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Anyone cast bullets for 300 blk?

TLDR; Anyone cast for 300 blackout? Mainly looking for a plinking round at 100 yards. I want to load both Supers/Subs.

I recently built a 300 blackout using an Anderson lower and a BCA 7.5", 1:8 twist complete upper. With 308 FMJ bullets coming out to 20 cents a pop, I found it way more economical start casting and powder coating my own.

The casting lead i started out with is straight WW lead, at ~14-16 bhn. Fluxed and pours fine.

I had terrible luck with the 230/309 lee double cavity mold. Upon inspection of the casts, the land located close to the middle of the bullet and just ahead of the lube grooves mics at 305", making these casts undersized. On top of that, there is a boat tail on the mold that many accounts causes further inaccuracy and gas cutting (getting leading). I decided to cut my loss on this 20 dollar mold (perhaps i got a lemon?) and buy a 6 cavity .312 160 gn mold instead.

A buddy of myn owns the 312/160 and gave me some casts (16 BHN) to try out. After powder coating and resized to 309, they shot alot better and cleaner (no leading) but still getting minute of paper (8" group) at 100 yards. Granted, I probably had my crimp set too heavy (still set from those undersized 230/309 bullets), and using 17.5-19 gns of h335 (i know this powder is too slow, but it cycles the round and chronos around ~1500 fps).

----

Despite of all of this, i'm pretty optimistic about this whole venture. I heard people modifying the 230/309 mold by reaming out the boat tail with a 5/16 reamer. Will probably start with this before trying to ream out to the undersized land.

I have some imr4227 powder at hand and will use this stuff instead of h335 on the 160/sized 309 supers. I also have a 311 sizer on the way for loading these bullets up in a 7.62x39.

Furthermore, I am aware that gas checks are also a must for supers, and i got those on the way as well as a lyman cast 4th edition book for a formal read and reference on casting.

Anyone doing/had done this? Any tips/tricks/advice is accepted. Thanks!
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Old September 2nd, 2020, 08:51 PM #2
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Read this and the help I got.
https://www.mdshooters.com/showthread.php?t=242694

I have molded the Lee 160 .311 die Powder coated gas checked and sized to 309 and have a plinking load for 300blk shooting steel at 100 yards. After shooting it more I'd say I get about 2-3 MOA @ 100yards
15.0gr H110 2.030"

I have molded the Lee 230 .309 die powder coated gas checked and sized to 309 and have a subsonic load for 300blk shooting steel at 100 yards supressed. After shooting it more since that thread, I get about 3-4 MOA @100 yards
9gr H110 2.260"
I don't do a GREAT job of weeding out my rejects so every once and a while I have a flyer. Yes, I gas check the boat tailed 230 cause without gas checking, its not as accurate. you need a flat base that powdercoating just does not give you. It will work ,but not as accurate as gas checked.

John gave me a lyman M die to flare the mouth which is needed to use these powder coated bullets. The setting of my FCD crimp basically closes it back down but not really a crimp.
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Old September 2nd, 2020, 09:05 PM #3
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One of the reasons I bought into .300blk was "hey, trim and resize 5.56 casings. This will be dirt cheap. So far, I buy a case of 5.56 for half what I pay for .300.
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Old September 2nd, 2020, 09:10 PM #4
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Quote:
Originally Posted by Slowhand View Post
One of the reasons I bought into .300blk was "hey, trim and resize 5.56 casings. This will be dirt cheap. So far, I buy a case of 5.56 for half what I pay for .300.
Casting for 300blk and powder coating is less $ and more practical than .223

for me, Its more the hobby than saving $.
But since you mention it, I"m paying about 10 cents a round of my Powder coated casted 300blk with the free lead I got. The labor is quite high though. Like I said, a hobby.

My reloaded .223 with bulk FMJ for shooting steel is I recall 26 cents a round.
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Old September 2nd, 2020, 10:28 PM #5
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Quote:
Originally Posted by Melnic View Post
Read this and the help I got.
https://www.mdshooters.com/showthread.php?t=242694

I have molded the Lee 160 .311 die Powder coated gas checked and sized to 309 and have a plinking load for 300blk shooting steel at 100 yards. After shooting it more I'd say I get about 2-3 MOA @ 100yards
15.0gr H110 2.030"

I have molded the Lee 230 .309 die powder coated gas checked and sized to 309 and have a subsonic load for 300blk shooting steel at 100 yards supressed. After shooting it more since that thread, I get about 3-4 MOA @100 yards
9gr H110 2.260"
I don't do a GREAT job of weeding out my rejects so every once and a while I have a flyer. Yes, I gas check the boat tailed 230 cause without gas checking, its not as accurate. you need a flat base that powdercoating just does not give you. It will work ,but not as accurate as gas checked.

John gave me a lyman M die to flare the mouth which is needed to use these powder coated bullets. The setting of my FCD crimp basically closes it back down but not really a crimp.

Thanks for the informative response and reference. I'll try gas checking and getting my hands on some h110 and report back on accuracy.
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Old September 2nd, 2020, 10:37 PM #6
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Lee 309 230 powder coated and sized to .311

Cheap Sub plinking bullet

7.8 gr lil gun around 2 moa


Burns super dirty though, will look at h110 when this 5 lbs is used up.
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Old September 4th, 2020, 12:54 AM #7
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Quote:
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Lee 309 230 powder coated and sized to .311

Cheap Sub plinking bullet

7.8 gr lil gun around 2 moa


Burns super dirty though, will look at h110 when this 5 lbs is used up.
I have the same mold. What distance are you achieving 2 moa at and what gun are you using? I get 6" groups at 100 with 10gn imr 4227 with a 7.5" 1:8 twist barrel.

I'm experiencing a bit of leading with this load and the bearing surface engaging the case neck is undersized at 305" with powder coat so a substantial crimp is a must to prevent bullet setback.
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Old September 4th, 2020, 03:45 AM #8
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I make Lee .312-160gn TL and NOE .309-150gn and powder coat them. Since I use them mostly for rapid fire practice at 50 and 100 yards, I don't weight them but just do a visual. I get about 1.5 to 2 inch groups at 50 to 3 to 4 inch groups at 100 from my 16 inch build. I benched my just built 8.5 inch pistol yesterday and got even tighter groups at 50 yards. 300 Blackout has tight chambers so it is important to use .223 brass with thinner walls when you make your brass or when you load the neck will be too thick.

If I were buying molds and were going to powder coat today, I would look at NOE molds as he has made plain molds for the caliber just for powder coating.

I size to .309 and use 16.5 to 17 gns of H110 for my loads.
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Old September 4th, 2020, 06:55 PM #9
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Quote:
Originally Posted by John from MD View Post
I make Lee .312-160gn TL and NOE .309-150gn and powder coat them. Since I use them mostly for rapid fire practice at 50 and 100 yards, I don't weight them but just do a visual. I get about 1.5 to 2 inch groups at 50 to 3 to 4 inch groups at 100 from my 16 inch build. I benched my just built 8.5 inch pistol yesterday and got even tighter groups at 50 yards. 300 Blackout has tight chambers so it is important to use .223 brass with thinner walls when you make your brass or when you load the neck will be too thick.

If I were buying molds and were going to powder coat today, I would look at NOE molds as he has made plain molds for the caliber just for powder coating.

I size to .309 and use 16.5 to 17 gns of H110 for my loads.
Yeah. i heard the NOE molds are good. I just got my lee 6 cavity 309/160 mold and I forgot to order a pair of 6 cavity handles for it luckily amazon prime got that covered i will get it by sunday.

As for 223 brass conversions, i got a printed list i found online on which head stamps to sort out.
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Old September 4th, 2020, 07:13 PM #10
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Quote:
Originally Posted by guzma393 View Post
Yeah. i heard the NOE molds are good. I just got my lee 6 cavity 309/160 mold and I forgot to order a pair of 6 cavity handles for it luckily amazon prime got that covered i will get it by sunday.

As for 223 brass conversions, i got a printed list i found online on which head stamps to sort out.

We probably all have the same list.
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