Need subsonic 300 blk load with 170-180 gr

[jef291]

Does anyone have a starting load/powder for jacketed 170-180 gr bullets? I came into 1000 of these and cant find any data in subsonic in this bullet weight. I do not know the bullet manufacture. They had been purchased at a show in large plastic bag. they are flat base copper plated pointed solid tip and weigh at 170-172 gr on scale.

 

[deesly1]

What is the Make and Model of the Bullet?

 

[GUNSnROTORS]

Sorry, don't have any subsonic load data for bullets < 210 grains. Good luck.

 

[jef291]

I do not know the bullet manufacture. They had been purchased at a show in large plastic bag. they are flat base copper plated pointed solid tip and weigh at 170-172 gr on scale.

 

[JailHouseLiar]

Does anyone have a starting load/powder for jacketed 170-180 gr bullets? I came into 1000 of these and cant find any data in subsonic in this bullet weight. I do not know the bullet manufacture. They had been purchased at a show in large plastic bag. they are flat base copper plated pointed solid tip and weigh at 170-172 gr on scale.

What powder, what gas system, what barrel length?

PM me and I'll help you out best I can.

 

[Winterborn]

Does anyone have a starting load/powder for jacketed 170-180 gr bullets? I came into 1000 of these and cant find any data in subsonic in this bullet weight. I do not know the bullet manufacture. They had been purchased at a show in large plastic bag. they are flat base copper plated pointed solid tip and weigh at 170-172 gr on scale.

What is your goal for this bullet? What type of gun?

If this is a semi-auto, chances are that any load that is subsonic with that bullet will not cycle the action, pick up a new round, and/or lock the bolt back on empty.

As mentioned above, the type/length of gas system, powder you are using, barrel length, etc... all factor into a subsonic load for 300 BLK.

Also, are you running this suppressed or un-suppressed? Makes a huge difference on gas pressure.

I have some 180gr bullets that I would love to run subsonic, but as my only 300 BLKs are both semi's I have not had much luck.

Good luck, I'm interested in what you find.

 

[wgttgw]

I don't want anyone to take this the wrong way and bust my chops, but what is all the fascination with subsonic in the blackout? Are there that many people with suppressors? Are they that quite without a suppressors? I don't have a suppressor for mine you I just load for function and accuracy.

Sierra has a free PDF out there (IIRC it has even been linked here) with data on 175-180 gr bullets. It lists 14.6 gr of H4198 at 1350 fps. I have no idea if that will cycle your gun, but I would start there and go up or down as you need.

 

[Kingjamez]

I don't want anyone to take this the wrong way and bust my chops, but what is all the fascination with subsonic in the blackout? Are there that many people with suppressors? Are they that quite without a suppressors? I don't have a suppressor for mine

Just because you don't have a suppressor, doesn't meant other people don't.

 

[wgttgw]

That was really my point, not to question anyone. Do you guys who mention subsonic a lot have suppressors? Subsonic being below 1126 fps and data available for 1350 fps with the bullet weight the OP mentioned is the 224 fps really that much different in sound? I ask because I don't know and really would like to understand.

Again I don't have a suppressor, I have not tried the blackout loaded subsonic, but in some guns which I have loaded subsonic the sound was not that much different.

 

[Winterborn]

I don't want anyone to take this the wrong way and bust my chops, but what is all the fascination with subsonic in the blackout? Are there that many people with suppressors? Are they that quite without a suppressors? I don't have a suppressor for mine you I just load for function and accuracy.

Subsonics are A LOT quieter even without a supressor. It is kind of a challenge for me to find a load that will cycle the action and chamber another round (I only shoot AR BLKs) while still remaining subsonic. So far, the heavier the bullet the better with this, along with a shorter (pistol length) gas system.

I don't have a suppressor either, as its hard for me to justify +1k for one item (adds up - suppressor cost + trust + tax stamp, etc...). I'd rather buy guns/ammo with that money.

That was really my point, not to question anyone. Do you guys who mention subsonic a lot have suppressors? Subsonic being below 1126 fps and data available for 1350 fps with the bullet weight the OP mentioned is the 224 fps really that much different in sound? I ask because I don't know and really would like to understand.

Again I don't have a suppressor, I have not tried the blackout loaded subsonic, but in some guns which I have loaded subsonic the sound was not that much different.

You should try it, its amazingly soft shooting and pleasant. Another challenge is maintaining accuracy with subs, but they really are designed for inside 100yds. At 200 yds my accuracy is terrible.

The difference in sound is due to the sonic boom of the bullet. As it breaks the sound barrier that gives is the distinctive "CRACK" sound.

Another reason to develop a sub-load that cycles and is reliable at short ranges is the home defense option, where a muted shot without the sonic crack might be nice to have when you are shooting inside, or at an indoor range.

I am working on sub loads due to the fact that I can cast 230gr bullets from free lead, and thus my ammo cost is very low. I really enjoy shooting my blackout, and when I shoot cast lead subs it is very cheap.

Rich

 

[jef291]

Ok back to original topic. I have a 11.5 AAC and an 8 AR uppers SBRs and AAC 7.62SDN6 can. I will purchase what ever powder is recommended. For the person who thought the cost of the stamp and 800 for can. If you use the one I have you can use it on 308 bolt guns. ARs and 5.56, 300 BLK, 5.7 and so on so you only have one cost and several gun/caliber combos. It helps when you need to dispose of critters and don't want neighbors complaining

 

[Klunatic]

I know Lehigh defense use 11 grains of Alliant 1680 with a 194 grain bullet. With 180 grain and the pistol length gas system I would start at 10 and see what you get.