Jumped into 300 BO

[JJ]

I see some of you posted fps your getting with a particular bullet. Can the rest of you post what your getting? As for the heavy bullets, are you getting fast enough for expansion? Some day I will get a suppressor and would like to know the particulars of running suppressed. For you guys with suppressors, are you sharing between rifles or do they have there own? I almost ordered one but the 300 BO came up 1st. Once this is completely put together, then will save for one. Ordered my lower and parts today. Now to look for a red dot. Have an EOTECH on the 308AR but the vortex version is looking good.

i've played a lot with 110-150g loads.

I've settled with Speer 125g TNT or Nosler 125g BT. With N110, i was in the 2150fps area, depending on which of my 10" pistols i chrony'ed over.

Due to cost, i moved over to H110, and those 125g pills are clicking pretty close to 2075fps. Both bullets have had no issue getting clean kills on MN whitetail out to 175yds. Due to minimum threshold for expansion, about 225yds is my functional limit for deer hunting.

[Bearcatrp]

You folks with high fps, are these compressed loads? Looking at the case of a 300 BO and a 5.56, looks like you could ream the chamber a little deeper for more case length. Me being new to this, just an observation. Not sure if that could even be possible. But if it could, a little more powder to push heavier loads.

[OldmanFCSA]

I see some of you posted fps your getting with a particular bullet. Can the rest of you post what your getting? As for the heavy bullets, are you getting fast enough for expansion? Some day I will get a suppressor and would like to know the particulars of running suppressed. For you guys with suppressors, are you sharing between rifles or do they have there own? I almost ordered one but the 300 BO came up 1st. Once this is completely put together, then will save for one. Ordered my lower and parts today. Now to look for a red dot. Have an EOTECH on the 308AR but the vortex version is looking good.

i've played a lot with 110-150g loads.

I've settled with Speer 125g TNT or Nosler 125g BT. With N110, i was in the 2150fps area, depending on which of my 10" pistols i chrony'ed over.

Due to cost, i moved over to H110, and those 125g pills are clicking pretty close to 2075fps. Both bullets have had no issue getting clean kills on MN whitetail out to 175yds. Due to minimum threshold for expansion, about 225yds is my functional limit for deer hunting.

Read all postings, some statements I agreed with - others I did not. But after reading all the different opinions here - I'm glad I have an AR-15 upper chambered for the 7.62X39 round. Magazine were an issue at first but correct mags solved that feeding problem, and the AK-47 round is a perfect deer hunting round with power like a 30-30.

IMHO.

[grimbeaver]

You folks with high fps, are these compressed loads? Looking at the case of a 300 BO and a 5.56, looks like you could ream the chamber a little deeper for more case length. Me being new to this, just an observation. Not sure if that could even be possible. But if it could, a little more powder to push heavier loads.

Nosler load data lists a 110gr using H110 at 100% case fill as pushing 2361 fps so it's plausible one could push 2400 with the right components without compressing it.

[Bearcatrp]

I can see using a pistol powder for short barrels but for carbine size (16 inch) why isn't one of the fastest rifle powders used? 8208XBR comes to mind. But with small case volume am pretty sure that's why. Curious if someone tried reaming the chamber to allow a longer case. Cut off a 5.56 just below the bottle neck. Would allow more powder to be used. Just speculating. Think I will buy some commercial ammo to test and chrono while I buy my dies and stuff. Along with the purchase of the upper, got 200 pieces of 300 BO brass and about 2000 pieces of 5.56 to cut down. Will be starting wet tumbling today.

[Vlad]

I have the same experience as JJ. Settled on 125 gr Nosler BT. With VVn110. 12 in barrel pistol gets me 2 moa at 100 yards. I have harvested a number of MN whitetails with no problem with penetration amd expansion.

[BigDog58]

I can see using a pistol powder for short barrels but for carbine size (16 inch) why isn't one of the fastest rifle powders used? 8208XBR comes to mind. But with small case volume am pretty sure that's why. Curious if someone tried reaming the chamber to allow a longer case. Cut off a 5.56 just below the bottle neck. Would allow more powder to be used. Just speculating. Think I will buy some commercial ammo to test and chrono while I buy my dies and stuff. Along with the purchase of the upper, got 200 pieces of 300 BO brass and about 2000 pieces of 5.56 to cut down. Will be starting wet tumbling today.

Natchez has the Lee Pacesetter 300 BO dies on sale for $27.49 if they interest you?

[fine ape]

I can see using a pistol powder for short barrels but for carbine size (16 inch) why isn't one of the fastest rifle powders used?.

Because that's what listed by most
https://load-data.nosler.com/load-data/ ... -blackout/

Remember H10 was developed for the 30 carbine, it's labeling as a magnum pistol powder came later.
If I'm wrong Sam will be by shortly.

[Bearcatrp]

I can see using a pistol powder for short barrels but for carbine size (16 inch) why isn't one of the fastest rifle powders used?.

Because that's what listed by most
https://load-data.nosler.com/load-data/ ... -blackout/

Remember H10 was developed for the 30 carbine, it's labeling as a magnum pistol powder came later.
If I'm wrong Sam will be by shortly.

Had no idea H110 was developed for a 30 carbine. Looks like I will have to pick up a few pounds to start. Used it before when I was reloading 44 mag.
Thanks for the tip on the dies. Natchez rubbed me wrong on my last order on shipping fees but will check them out. Thanks.

[photogpat]

8" barrel with a 125gr Speer TNT over H110/W296, I can push well over 2100fps, but the most accurate node is around 2000fps.

With a converted LC 556 case, CCI#400...I'm at 18.1gr H110.

Now, according to the Internet...some guys are pushing this same bullet with more than this...but I was getting REALLY strong pressure signs much past 18.3, and opted to save my eyesight/fingers/firearm.

[Bearcatrp]

Brass made for 300 BO is the same as 5.56 cut down or is it different?

Just looked it up. 7.62x35mm. Was believing 5.56 cut down was used. Guess I missed that in my research. So, better to cut down 7.62 brass or 5.56 brass?

[Ghost]

For a 7.5" short barrel AR you have better options than 300BO?

I don't have first hand experience with that short of barrel on anything but 5.56.

However, according to LRRPF52 (the guy that wrote the Grendel reloading books) a 7.5" Grendel shooting a 129 ABLR has a point blank range of 225 yards using a 200 yard zero.

According to AA a 10.5 inch Grendel exceeds AK-47 ballistics. By 100 yards the energy between the two is practically identical. At 300 yards the Grendel is traveling 300fps faster, makes 350ft/lbs more energy and drops 4" less. The longer the distance the more the Grendel stretches it's lead.

A 10.5" Grendel has more energy at 400yds than a 20" 30-30 pushing 150gr does at 200yds.

And another reason it works well for pistols and short barrels -

The free recoil generated by a Grendel throwing a 123-grain bullet 2,350 fps from a 7-pound rifle is just 7.5 foot-pounds. Compare that to the 17 foot-pounds kicked up by a 308 Winchester spitting a 150-grain bullet 2,800 fps and you begin to realize the wonderful advantage a round like the Grendel has for shooters who cannot tolerate heavy recoil.
https://ronspomeroutdoors.com/blog/6-5-grendel-deer-hunting-surprise/

[george]

Brass made for 300 BO is the same as 5.56 cut down or is it different?

Just looked it up. 7.62x35mm. Was believing 5.56 cut down was used. Guess I missed that in my research. So, better to cut down 7.62 brass or 5.56 brass?

I have never purchased 300AAC, I started making them from the get go. 223/5.56 cut down. The only cases I've had any trouble with has been Seller & Beloit, the
brass seems to be a bit thicker in the neck area so I jest avoid it. Here is a picture of my cutting table. I have barrels in 8.25, 10.5 & 16" running SUB & Supper in all with no
problems now. Had to do some changes on the 16" for the SUB's.
[img]

300%20AAC%20Cutting%20Table.jpg

[/img]

[Bearcatrp]

Thanks for the pic and info. I have a dremmel to cut the brass down. May have to consider something else to cut 2000 of them. About 2000 pieces of 5.56 brass came with the deal. Most are nato. Should put me over for awhile. BTW, are P-Mags gtg or are there better ones out there?

[870TC]

the mag issues general show up only with the heavy...200grain + bullets, the bullet ogive hits one of the mag ribs and tips the bullet toward the center of the mag. I have had no issues with the various 120-165 grs that I have tried with military mags, pmags and Lancers.