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  #1  
Old 01-18-2014, 3:57 PM
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Default Just tested my .300 blackout loads.

loaded a workup for 230gr lead boolits from 6.8gr to 9.5gr Alliant 2400. None of them cycled the bolt to load the next round.

My book maxes out at 9.5gr for safe loads, but I didn't notice any signs of pressure. should I try a half grain / grain more? or should I be considering a lighter buffer at this point?

Platform is a 8.5" pistol (with pistol gas system obviously )
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  #2  
Old 01-18-2014, 4:09 PM
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Is your gas tube port lined up correctly? I haven't loaded 300 blackout but if you carefully creep up I don't see a problem with carefully bumping over max. Having a chrono would help.

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  #3  
Old 01-18-2014, 4:20 PM
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which buffer and spring are you using?
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  #4  
Old 01-18-2014, 7:00 PM
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H2 carbine

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  #5  
Old 01-18-2014, 7:18 PM
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I say check your gas tube alignment. See if you can tape the chamber area (blue tape), then clean the muzzle (tape the brake as well), then blow in from the front and put your hand on the gas tube opening in the upper receiver to see if you're getting enough gas or if it feels blocked. make sure the bcg is out of the upper to do this.

you could also check your spring/buffer combo and make sure you have the right setup. what kind of buffer/spring setup you have and what kind of buffer tube do you have?

then, rather than relying on a charge weight in a book, do a load workup and do 3 rounds of each (maybe go up to 1 grain above stated max load. you can also pull down any that would show signs of pressure). then, fire one round of each and check for pressure after each shot. once you hit pressure signs, load 2 more of the charge before the pressure sign started and see if it cycles.
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  #6  
Old 01-18-2014, 9:42 PM
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2400 is a pretty fast burning powder to be pushing subs.

I assume this isn't your first rodeo with 300 blk buy seeing you in the reloader forum. All of your previous loads cycle and your just trying something new?

What size is your current gas port size?
Have you checked your block alignment? I put a scribe in my gas block to show center and a LF&RT limit scribe on my barrel (sharpie).

I don't think you need to change your spring and buffer if your running carbine buffer and spring.
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Old 01-18-2014, 10:27 PM
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A slower powder will give you more pressure at the gas port, but also a louder bang. The recipe book calls for IMR4198, which is considerably slower than Alliant 2400.

As I recall the published subsonic loads were not max pressure, just max load not to go subsonic, but your 9.5g of 2400 is right on the edge of allowable pressure according to quickload.
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  #8  
Old 01-18-2014, 10:34 PM
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I will be reloading 125 grains first to test my new SR30 for relaibaility and functionality. Then I will get into the subsonic.In regards to the buffer type, you are using the right setup. Recommend to use proven loads.
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  #9  
Old 01-19-2014, 12:38 AM
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Quote:
Originally Posted by promethean_spark View Post
A slower powder will give you more pressure at the gas port, but also a louder bang. The recipe book calls for IMR4198, which is considerably slower than Alliant 2400.

As I recall the published subsonic loads were not max pressure, just max load not to go subsonic, but your 9.5g of 2400 is right on the edge of allowable pressure according to quickload.
I'll have to research some load data for IMR 4198. I have a large supply of both that and 2400.

I initially bought the 2400 as it doubled as a 357 powder; tried to kill two birds with one stone.

This is the first upper that I have built and I suspected that the gas port alignment might be an issue. I marked the gas block and barrel with lines to match up when I put it together, and I'm not sure what my gas port size is, I may need it to be enlarged.
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Old 01-19-2014, 12:47 AM
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Quote:
Originally Posted by Germz View Post
I'll have to research some load data for IMR 4198. I have a large supply of both that and 2400.

I initially bought the 2400 as it doubled as a 357 powder; tried to kill two birds with one stone.

This is the first upper that I have built and I suspected that the gas port alignment might be an issue. I marked the gas block and barrel with lines to match up when I put it together, and I'm not sure what my gas port size is, I may need it to be enlarged.
i use imr 4227 for all my 300 blk loads.

why in gods earth are you loading 230 loads
220s are plenty good for going sub...
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  #11  
Old 01-19-2014, 12:56 AM
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Quote:
Originally Posted by racerfox View Post
i use imr 4227 for all my 300 blk loads.

why in gods earth are you loading 230 loads
220s are plenty good for going sub...
'tis be the weight of boolits that drop from my LEE TL309-230 "300 blackout" mold
the lead is all free to me anyway. might as well.
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  #12  
Old 01-19-2014, 6:31 AM
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I am in the adjustable gas block fan club. For 300blackout I think it just makes life so much easier.

on another note, how is that Lee mold treating you? I think I will be getting that one very soon
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  #13  
Old 01-19-2014, 6:58 AM
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Unfortunately 2400 is probably going to be troublesome with a barrel that short. I had similar issues with cast boolits using 2400 in 7.62x39. I had to increase to near max loads to get them to cycle in all my 16" barrel ak's and sks. The shorter barreled AMD65 would have none of it. There just wasn't enough dwell time after the bullet passed the gas port.


On a side note....any way I could acquire a few of your CB's to try in my blk guns?
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  #14  
Old 01-19-2014, 7:09 AM
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Quote:
Originally Posted by cgates View Post
I am in the adjustable gas block fan club. For 300blackout I think it just makes life so much easier.

on another note, how is that Lee mold treating you? I think I will be getting that one very soon
its great. lee gets an average wrap for being low quality. treat them well and they will work well. lube them every 100 casts and they will last. preheat them and smoke them if you want. I use burts beeswax chapstick for mold lube; cheap and at walgreens.

Quote:
Originally Posted by tujungatoes View Post
Unfortunately 2400 is probably going to be troublesome with a barrel that short. I had similar issues with cast boolits using 2400 in 7.62x39. I had to increase to near max loads to get them to cycle in all my 16" barrel ak's and sks. The shorter barreled AMD65 would have none of it. There just wasn't enough dwell time after the bullet passed the gas port.


On a side note....any way I could acquire a few of your CB's to try in my blk guns?
powdercoated or plain? come on by and donations are appreciated . keep in mind they are quite soft. probably around 8 or 10 BHN
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Old 01-19-2014, 8:58 AM
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Powdercoated? You kids and yer fancy newfangled boolits.

I'll send you a PM. Maybe we can work something out by mail. Oceanside is a bit of a drive from THE SFV.
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Old 01-19-2014, 9:13 AM
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Try AA-1680 if you can.
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Old 01-19-2014, 10:06 AM
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Quote:
Originally Posted by 3006mv View Post
Try AA-1680 if you can.
Yeah, that seems to be the preferred powder for subs. I've been testing H110 which works great for supersonic but I haven't gotten them to cycle yet with subs although I can go a little higher before giving up. It's on my to do list but if I by some miracle run into some 1680 first I'll just switch to that.

I like the boolits from that lee mold.
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Old 01-19-2014, 10:32 AM
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Quote:
Originally Posted by Germz View Post
'tis be the weight of boolits that drop from my LEE TL309-230 "300 blackout" mold
the lead is all free to me anyway. might as well.
i understand where your coming from but you live in komi califronia you cant run a suppressor so no reason in my mind to run sub ammo

i had great results with WIN 296 and nosler 125gr
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  #19  
Old 01-19-2014, 2:41 PM
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Quote:
Originally Posted by racerfox View Post
i understand where your coming from but you live in komi califronia you cant run a suppressor so no reason in my mind to run sub ammo
Cheap plinking rounds. Although to be honest part of why I never finalized a load is that I got the plated flat tips from xtreme working as a lower powered supersonic load so I have less incentive now.
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Old 01-19-2014, 6:07 PM
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Quote:
Originally Posted by racerfox View Post
i understand where your coming from but you live in komi califronia you cant run a suppressor so no reason in my mind to run sub ammo

i had great results with WIN 296 and nosler 125gr
I can't use chop sticks so no reason in my mind to eat sushi.
same logic; fallible.



by the way I do know how to use chop sticks..

no on a serious note though I just like the large slow moving "45 Auto-esque" ballistics. and since the TL309-230-5R mold is the only one I own or saw that was designed specifically for 300 (under $30)....might as well go big.
besides, the slower I run these (in FPS) the less I have to work to find a strong(er) alloy for higher velocities.

Last edited by Germz; 01-19-2014 at 6:10 PM..
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Old 02-24-2014, 8:17 PM
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Also try 4198, Reloader 7 or 4227. Otherwise stock up on AA1680.
if you go slow enough you may not even have to powder coat those. I have not been getting any leading since I stopped using the Lee FCD and started flaring the case mouths.
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  #22  
Old 02-24-2014, 9:17 PM
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Quote:
Originally Posted by 3006mv View Post
Also try 4198, Reloader 7 or 4227. Otherwise stock up on AA1680.
if you go slow enough you may not even have to powder coat those. I have not been getting any leading since I stopped using the Lee FCD and started flaring the case mouths.
yeah I have 8# of 4198 and 4# of 1680. the 1680 does not burn clean and im constantly peppered with unburnt powder. 4198 sucks at metering as well.

1680 cycles flawlessly at 10.5gr in my pistol gas system.
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  #23  
Old 02-24-2014, 10:59 PM
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Quote:
Originally Posted by Eljay View Post
I got the plated flat tips from xtreme working as a lower powered supersonic load so I have less incentive now.
Do you mind sharing your method?
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  #24  
Old 02-24-2014, 11:44 PM
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Just to add to my list of reasons for subs, God forbid I have to be in the unfortunate scenario of shooting a home invader. However if that day ever came I rather hit the invader with subs and run a lesser risk of a round over penetrating into a neighboring home.
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Old 04-28-2014, 10:19 AM
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Quote:
Originally Posted by Eljay View Post
Cheap plinking rounds. Although to be honest part of why I never finalized a load is that I got the plated flat tips from xtreme working as a lower powered supersonic load so I have less incentive now.
Mind sharing your recipe?
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  #26  
Old 04-28-2014, 11:10 AM
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bump from the dead eh? lol

10.5gr of AA1680 works flawlessly with my 230gr casts now.
I bet Lil gun would work great with those xtremes though.
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Old 04-28-2014, 11:13 AM
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Quote:
Originally Posted by Germz View Post
bump from the dead eh? lol

10.5gr of AA1680 works flawlessly with my 230gr casts now.
I bet Lil gun would work great with those xtremes though.
Dead would have been 3 months old.

Did you try the xtremes at all?
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  #28  
Old 04-28-2014, 12:40 PM
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I have a couple kegs of 'Lil gun and want to try the Xtremes.

Right now I have 2K of 147FMJ... but I'll gladly take a cheaper bullet if it's reliable!
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Old 04-28-2014, 1:12 PM
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check your gas rings on your bolt, make sure they are not lined up in a line.
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