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Old October 27th, 2020, 05:56 PM #1
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300 Blackout C.O.L / load data question

Howdy Folks,

Its been a few years since I have done much reloading, but i am getting back into it.

I pulled out my 300BO the other day and wanted to reload.

as i was double checking the websites for load data, I seem to have forgotten what the rules for determining the C.O.L for the blackout are.

none of the websites really had any information that was useful to me, and they only had a select few projectiles listed, most were not the ones that I currently own.

the list the projectiles that i currently have for the 300BO:

125g nosler ball tip #BT3355
150g Hornady fmj-bt
150g nosler ball tip #BT3365
165g nosler accubond
178g hornady A-max
180g hornady BTSP interlock
180g nosler accubond spitzer
200g nosler accubond spitzer

again- primarily i am just seeking how to determine the C.O.L data for these, but any and all load data for these projectiles is welcomed.

also, I am primarily using for powder:
H110
Lil-gun

Thank you ALL, for the help.
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Old October 27th, 2020, 06:10 PM #2
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On the lighter bullets you'll never meet mag length as there just isn't enough bullet in the neck. The longer bullets will be stuck at mag length provided you aren't hitting rifling.

https://load-data.nosler.com/load-da...-aac-blackout/

Look up the rest based on the powders you're using. Break out your reloading books, or do a google image search or two.
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Old October 27th, 2020, 06:28 PM #3
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I always rely on this sight for things 300AAC...


http://www.300blktalk.com/forum/viewtopic.php?t=83317


This can be helpful at times too...


https://www.hodgdonreloading.com/data/rifle
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Old October 27th, 2020, 06:31 PM #4
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For Hornady 150gn Boat Tail, I load with 16.5 of H110/WW296 and the COAL is 2.240. This is shot in a carbine with 1 in 8 twist using mags made for 300 BO.
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Old October 27th, 2020, 07:23 PM #5
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You should invest in the Hornady OAL tool, or a like one, to determine the greatest OAL for your own firearm.
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Old October 27th, 2020, 07:44 PM #6
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One of the oddities of 300 Blkout is that they don’t function well in a standard AR magazine if the ogive of the bullet is seated at or forward of the big indent at the front of the magazine. This indent has a purpose for standard 223 ammunition as it keeps the 223 ammunition from moving forward in the magazine by keeping the neck of the cartridge behind it.

For light bullets this isn’t normally an issue and the can usually be loaded to magazine length or shorter for better accuracy. For heavier bullets it does become an issue so they have to be loaded shorter so their ogive doesn’t contact this indent. I’ll see if I can post some pictures of the Hornady manual with actual COL based on bullet weight.

I hope this makes sense.
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Old October 27th, 2020, 08:03 PM #7
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Quote:
Originally Posted by RetiredArmyGuy View Post
One of the oddities of 300 Blkout is that they donít function well in a standard AR magazine if the ogive of the bullet is seated at or forward of the big indent at the front of the magazine. This indent has a purpose for standard 223 ammunition as it keeps the 223 ammunition from moving forward in the magazine by keeping the neck of the cartridge behind it.

For light bullets this isnít normally an issue and the can usually be loaded to magazine length or shorter for better accuracy. For heavier bullets it does become an issue so they have to be loaded shorter so their ogive doesnít contact this indent. Iíll see if I can post some pictures of the Hornady manual with actual COL based on bullet weight.

I hope this makes sense.
There is a mod for Magpul where you can sand down the forward guide but, now that they sell 300 BO mags, it isn't worth the trouble. I modified four mags before they started making them and it was hard on the hands.
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Old October 27th, 2020, 08:05 PM #8
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yes, I have several dedicated mags for the 300 BO that i took down the front, for clearance.

excellent.
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Old October 27th, 2020, 08:32 PM #9
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I bought the specially-made Lancers. They're labeled with "300BLK" in big bold letters, too, which is good. Would have preferred the Magpuls, but none were available when I was looking.

As for OAL, it's almost always the longest OAL that will fit in the mag, load smoothly, and not hit the rifling.
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Old October 27th, 2020, 08:33 PM #10
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Quote:
Originally Posted by mtlcafan79 View Post
On the lighter bullets you'll never meet mag length as there just isn't enough bullet in the neck. The longer bullets will be stuck at mag length provided you aren't hitting rifling.

https://load-data.nosler.com/load-da...-aac-blackout/.
I did see the nosler data sheets, and the only one that was useful to me was the 125Gr.

awesome,
thanks
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