load data for 155gr cast in 300 aac blackout

need some cast load data for 300 blackout I have some 155grn boolits ready to load once i find some data
have IMR 4227 and some TRAIL BOSS and some imr 4198 on hand

thabnk you
casca

What firearm to be fired in? Which mold?

On the safe side, start at low jacketed data on that range and work up. I've used unique, h110, lil gun and a1680, no data personally with those powders.

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Which "Accurate" Mold for my .300 Blackout?

What do you plan to fire them from? AR? Bolt gun? Handi Rifle?

I can't remember the mold number, but my dad has an accurate mold he uses for a .30-06 bolt action. I made some .300 dummies of that 175is grain boolit and couldn't get them to feed in my AR.

I haven't modified my feed ramps, but I see online where some have to accommodate a wider meplat boolit.

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300 blackout load data

The best source for j-word loads is probably on 300blktalk.com I have done 16.8gn of Lil Gun under the 147's and they worked well enough in both my AR's.

The 300blk is an easy cast boolit cartridge and a number of us here have worked up combinations that work well. Use the search.

My pet combo is a Lee C312-155-2R boolit with Hornady gas check sized to .310 with Tac#1 lube on top of 17gn of Reloder 7. Custom PTX is used to open the neck to .308 and impart a small flare during case powder charging. Seating and crimping is 2 steps and a Lee FCD is used to give a light crimp in the crimp groove. This combo works well for range work and wild hog hunting.

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Lyman vs Lee 300 Blackout dies

Boolit Mold Join DateMar 2012Posts3

Which dies would be better to use to make 300 blk from .223 brass? Thanks

No experience with the Lyman but have used Hornady, Lee and Redding. For loading I prefer the Hornady die set with a Lee FCD added. The Hornady seater is great for ensuring that the boolit enters the case mouth square.

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Abbreviations used in Reloading
Pointed Soft Point "Core Lokt"

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Lee blackout mold

I just got one from Midway, and it is fabulous. Looks like a custom mold. It uses alignment pins.
WOW is all I can say. They need to make all their molds this good.

what weight and profile is the bullet?

any pics?

But, of course.

WD COWW 234gr as they sit.
Meplate 0.10
Bore ride 0.302
Front drive(just fwd of lube grooves) 0.309
Aft drive band (just behind lube grooves) 0.311

Last edited by NSP64; Today at 04:14 PM.

It is now out of stock, but don't all the new LEE 2 cavs have those alignment pins now?

http://www.whyteleatherworks.com/

It is now out of stock, but don't all the new LEE 2 cavs have those alignment pins now?Just received a mold form Titan and it was the old style.

But, of course.
The bottom pic is a dummy for my Savage Axis in 308 win. The dark spot is the rifeling starting to engrave the ojive. OAL 2.880"

I dont know if they all use alignment pins now. If they do, I might buy all new mold from them. LOL

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Abbreviations used in Reloading
Pointed Soft Point "Core Lokt"

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300 blackout 120 grain cast bullet??

I'm looking for a mold to cast a 100 - 120 grain bullet that will feed in the 300 Blackout. I have some 110 grain j-words that will not seem to allow the bolt to close no matter how deep I seat them. It seems as though the round nose hits the rifling in the leade too soon and keeps the bolt from going all the way into battery. Any one have a recommendation in this weight range for a pointedty spire point for one they have used?

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Abbreviations used in Reloading
Pointed Soft Point "Core Lokt"

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300 blackout with NOE 247 and 4227 ... how much is to much?

I am working with the 247 grain NOE boolit in an AR-15 chambered in 300 blackout. I have problems getting the action to cycle. The rifle has a 16 inch barrel with a .120+ carbine length gas port. I have clipped a few coils off the buffer spring and am considering lightening the buffer. I now have decent ejection but it still short cycles. I have mated the gas block and gas port as well as verified the gas tube to gas block fit.

I can go super sonic as I am not running a can and can run gas checks if necessary to get reliable cycling.

I am using 4227 cause I like it and I can't find any 1680 for sale right now due to the panic.

The load data I can find for 4227 stops at sub sonic levels with pressures well below other listed supersonic loads, so I assume I can go higher on the powder charge without getting excessive pressures.

Does anyone have any idea what a max load of 4227 using this case / boolit?

Does anyone have quick load? Would it give me this type of information?

Any insight, tips or suggestions would be appreciated.

If you don't want to post load data please feel free to PM me with it.

Thanks in advance!

I think your problem lies in the burning rate of 4227 and your gas port. I say " think " as I read of a simular problem with a 223 AR. Anyway, do a search for "gas ports" & "gas blocks".
On the other hand, since you are limited to 4227, do the step test, load in .3 gn.steps till you see signs of pressure or your weapon cycles

IHMSA # 566 "time sure flies when you're having FUN"

That gas port size should allow proper function easily. I opened mine to .110" and have no problems when the right powder is used. I have never used 4227 so I will defer to the experience of others and assume its pressure curve is not suitable. So far the powders that work for me are H110, Lilgun (very good), AA5744 (very very good), and Reloader 7 (probably my favorite especially for heavies). It's all about gas volume and port pressure in this cartridge. I have had loads with some of the faster powders that were bordering on very high pressure and all I was getting was short stroking. But with the right powder, it runs like a champ and is alot of fun to shoot.

Wilson's combat makes a variable takeoff valve block. I have this gadget on order. The addition of the "can" will help smooth out "early" pressure curves. Last resort is playing with the springs because that affects the Lower's function and would make the gun less interchangeable. ... felix

Colt is bringing out a gun actually meant for caliber interchange. It's the 2100 dollar AR version, new this year. http://www.youtube.com/watch?v=0O9wUV8ozmk&feature=youtu.be ... felix

Last edited by felix; 03-09-2013 at 08:25 AM.

Leave the coils on the buffer alone. What buffer are you currently running?

I'd follow Wayne S advice and work up looking for signs of pressure.

You may just have to switch to a different powder with a burn rate that is a better match for your gun.

I appreciate all the ideas!

I am current running a carbine buffer. I need to weigh it and a spare that I have and see if any improvements can be made.

nhrifle -- were your reloader 7 heavy bullet loads sub or super sonic? Were the bullets cast or J's?

Once the panic settles down I will have some more powder options but powder and loaded ammo is difficult to find in this area at this time.

I plan to continue to work up loads in small increments as suggested, but would like some idea of where to stop. Waiting for cratered, flattened, loose or blown primers has always made me slightly nervous.

However this plays out I am planning to keep the buffer and spring dedicated to this upper as they probably will not be suitable for use with others after I tinker with them.

Will quick load give me the data that I am seeking? I have been considering buying a copy for years and just never got around to it.

Last edited by CATTLEMAN; 03-09-2013 at 10:41 PM. Reason: spelling

I've gotten a sonic crakc from every load I have tried so far that cycles the action. Once I get some 1680 (impossible to find around here) I will get some subs worked out.

One Solution

Dual adjustable gas ports on 300 Whisper barrel

My Synrac Ordinance adjustable gas block works great, adjusts easily, and fits under a free float tube. They have detents to keep adjustment with no loctite. They were about $100.

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Abbreviations used in Reloading
Pointed Soft Point "Core Lokt"

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