Big concerns with Hodgdon 300 Blk Data - AR15.COM

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[ARCHIVED THREAD] - Big concerns with Hodgdon 300 Blk Data ARCHIVEDAuthor Message

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Posted: 1/24/2012 5:00:01 PM [Last Edit: 1/24/2012 5:05:15 PM by

GACKER1143]

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GACKER1143

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Just got my dies today and formed up some Fed .223 Rem Brass. I don't have my upper yet to confirm Cartidge OAL I'm bassing this off my obsevation off my reloads. I think maybe they have the OAL with the Nosler BT 125s set to deep. I have the pinktip 123gr Factory ammo as a guage- bullet profile is very close to the Nosler. The oal for this round is 2.140" +/- and Hodgdon wants you to push the Nosler into the case for an oal of 2.060" , Why I have a problem with this? It puts the bullet obviusly deeper into the case -powder compression and puts the case mouth on the bullet alcove where good tension is not achieved. Trying to crimp the case will shove the bullet deeper-making things worse. Hopefully ACC will get wind of this and confirm or deny we may have a typo on the data?

Hopefully this may prevent problems with this load. As with all new cartridges care must be taken when so little data is available.

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titleiiredneck

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Originally Posted By GACKER1143: Just got my dies today and formed up some Fed .223 Rem Brass. I don't have my upper yet to confirm Cartidge OAL I'm bassing this off my obsevation off my reloads. I think maybe they have the OAL with the Nosler BT 125s set to deep. I have the pinktip 123gr Factory ammo as a guage- bullet profile is very close to the Nosler. The oal for this round is 2.140" +/- and Hodgdon wants you to push the Nosler into the case for an oal of 2.060" , Why I have a problem with this? It puts the bullet obviusly deeper into the case -powder compression and puts the case mouth on the bullet alcove where good tension is not achieved. Trying to crimp the case will shove the bullet deeper-making things worse. Hopefully ACC will get wind of this and confirm or deny we may have a typo on the data?

Hopefully this may prevent problems with this load. As with all new cartridges care must be taken when so little data is available.

plenty of data available, you can always use 300whisper,300/221 data as a basis since they are the same damn thing. Once you get your upper check oal and then reload.

37Bullet

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How about some pics. Just got my dies from Midway.

eightring

Member First, why would you want to crimp a bullet that does not have a cannelure? That is a no-no. You have to rely on neck tension.

I would just load to maximum magazine length. The blackout has a crazy long throat for the heavy subsonic loads.

Supersonic loads suffer from loss of accuracy due to the long

www.1050fps.com subsonic and NFA forums

Big concerns with Hodgdon 300 Blk Data - AR15.COM

http://www.ar15.com/forums/t_3_121/560756_Big_concerns_with_Hodgdon_300_Blk__Data.html[5/3/2014 6:38:41 AM]

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Posted: 1/24/2012 10:04:12 PM [Last Edit: 1/26/2012 2:20:22 PM by

GACKER1143]

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bullet jump to the lands.

You probably can't load the little 125gr bullet too long before it will no longer fit in your magazine.

GACKER1143

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eightring These are Nosler BT- yes they can be loaded longer then 2.260" easily. What I'm saying is the data that Hogdgon has shows you need to load to 2.060" which would create a bullet stuffed to far in the case. Yes you can crimp bullet without a canular when you don't have enough bullet tension especially in a semi auto-to prevent bullet set back! when I loaded these I didn't feel what I thought was enough tension so yes they will be crimped. I think looking at this cartridge and bullet set back with a full case of powder is definately a bad thing. That could be why AAA ammo went with a canulared bullet for there load -you think!!

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You probably haven't been reloading for very long, so you always start at the lower end and work up a load up to find what is safe is your rifle.

The Overall Length may fit in the mag, but you're double stacking 30 cal ammo in magazines that were made for 223 ammo. Grab a magazine. See the ribs running down the sides near the front? THESE limit the OAL for many bullets.

GACKER1143

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chipdog4 Been reloading for 30 + years! But yes I'm new to this cartridge and seeing it itself is very new I know with out the large amount of data as we see with other cartridges one must be cautious of what one does. This cartridge is short, uses full cases of powders and leaves very little room for errors! AR's are not a very strong actions as far as rifles go. As been stated by others they say this chambering has a long throat I guess I need to wait an see how the throat is on my upper-should be here next week. I've also noticed the OAL problem with .30 bullets in the mag. I just feed these rounds into the mag I'll use -if I go to long the bullet alcove will bind the rounds in the mag- got it! I have the rounds at 2.110" right now and they are right at the edge of interfearance by the rib. I'll have to see if they feed properly when shot.

agBQ08

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GACKER1143, here's a link to the original lengths Robert recommend for several bullets for the 300 BLK to fit in standard mags.

Keep in mind that testing has shown 2.12" is the necessary OAL required for military-level reliability and many standard 308 bullets can't be loaded that long. If you are just using this for hunting you should be golden.

• Nosler Ballistic Tip 125 grain, OAL: 2.085

Original OAL for 300 BLK

jsflyer

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Anytime you seat a bullet further into the case you are going to increase chamber pressure. I would assume Hodgdon seated the bullet that far into the case as a "worse case" scenario...you can adjust the bullet out to tune the "fit and function" as you see fit without running into any pressure problems that way.

45-Seventy

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Originally Posted By eightring: First, why would you want to crimp a bullet that does not have a cannelure? That is a no-no. You have to rely on neck tension.

I would just load to maximum magazine length. The blackout has a crazy long throat for the heavy subsonic loads.

"In God we trust"....Everyone else keep your hands where I can see 'em.

Big concerns with Hodgdon 300 Blk Data - AR15.COM

http://www.ar15.com/forums/t_3_121/560756_Big_concerns_with_Hodgdon_300_Blk__Data.html[5/3/2014 6:38:41 AM]

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Posted: 2/17/2012 5:32:46 PM [Last Edit: 2/17/2012 5:33:20 PM by

Recoil737]

Supersonic loads suffer from loss of accuracy due to the long bullet jump to the lands.

You probably can't load the little 125gr bullet too long before it will no longer fit in your magazine.

There's absolutely nothing wrong with crimping a bullet with no cannelure if you use a Lee FCD or other type of taper crimp die. That's what they were designed for.

GACKER1143

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agBQ08 Thanks for the info- been shooting now for about 3 weeks and have found that info out by messing with the loads I've developed. The OAL's are really to get function in the Mags- found this out the hard way. Unless you remove the rib in your mags oal is totally dependant on how the bullets rest on that rib. Seat them to long and they will bind an not feed. So far I found my 20 rounders( Stroners) work the best. My GI mags(30's) require a deeper seating to work.

On another note for those that reload are you finding that brass doen't seem to last to lobg in this caliber. I see a very quick loosening of the primer pockets! Now it might be the Federal brass I'm using but I also see it in the Factory (AAA) brass. Had two peices of AAA brass upon reloding that the primer just about fell out when reloading them.

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Originally Posted By GACKER1143: agBQ08 Thanks for the info- been shooting now for about 3 weeks and have found that info out by messing with the loads I've developed. The OAL's are really to get function in the Mags- found this out the hard way. Unless you remove the rib in your mags oal is totally dependant on how the bullets rest on that rib. Seat them to long and they will bind an not feed. So far I found my 20 rounders( Stroners) work the best. My GI mags(30's) require a deeper seating to work.

On another note for those that reload are you finding that brass doen't seem to last to lobg in this caliber. I see a very quick loosening of the primer pockets! Now it might be the Federal brass I'm using but I also see it in the Factory (AAA) brass. Had two peices of AAA brass upon reloding that the primer just about fell out when

reloading them.

Federal brass has a reputation of being soft and having loose primer pockets. Not the choice of reloaders.

Recoil737

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Originally Posted By chipdog4: You probably haven't been reloading for very long, so you always start at the lower end and work up a load up to find what is safe is your rifle.

The Overall Length may fit in the mag, but you're double stacking 30 cal ammo in magazines that were made for 223 ammo. Grab a magazine. See the ribs running down the sides near the front? THESE limit the OAL for many bullets.

Here is a list of OALs that will work with all magazines:

Hornady 110 V-Max, OAL: 2.068 Nosler Ballistic Tip 125 grain, OAL: 2.085 Remington AccuTip 125 grain, OAL: 2.130 Sierra 150 FMJ-BT, OAL: 2.080 Sierra 150 ProHunter, OAL: 2.040 Sierra 155 #2156 Palma, OAL: 2.130 Sierra 210 MatchKing, OAL: 2.190 Sierra 220 MatchKing, OAL: 2.089 Hornady 225, OAL: 2.140

ErikS

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Load to the mag length. OAL can be pretty arbitrary because bullet tips get banged up. On most AR type weapons the mags limit you not the chamber.

Recoil737

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Originally Posted By ErikS: Load to the mag length. OAL can be pretty arbitrary because bullet tips get banged up. On most AR type weapons the mags limit you not the chamber.

If you load to mag length then you won't be able to fit them in the magazine as the ogive of the bullet touches the rib of the magazine and if it is not placed correctly then the bullets won't feed properly or fill the magazine completely.

Don't just load to mag length! Use the chart above or just seat the bullet until it lines up the case in the magazine.

ffsparky 26: "(When it comes to making decisions about healthcare) Most folks are like middle schoolers ordering mixed drinks at a bar, asking for shit that they have no clue about."

Big concerns with Hodgdon 300 Blk Data - AR15.COM

http://www.ar15.com/forums/t_3_121/560756_Big_concerns_with_Hodgdon_300_Blk__Data.html[5/3/2014 6:38:41 AM]

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Posted: 2/18/2012 2:24:20 AM

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[ARCHIVED THREAD] - Big concerns with Hodgdon 300 Blk Data ARCHIVED

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GACKER1143

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1MAC Yep I know that one ! And in .223 Rem they are almost always very short. Thats why they became 300 BLK cases! Well I got plenty of PMC .223 cases as well I guess

they will be the next donor cases!

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