Favorite Bullet Weight for 300 Blackout?

Wreck-n-Crew · June 14, 2017, 02:21 PM

Just curious as to your favorite bullet weight for 300BO. I've been a busy beaver and taken my bullet casting to the next level. I am Building a Casting machine for some mass production and I'm curious as to what people are using in their 300BO.

Thanks.

**Unclenick** · June 14, 2017, 03:54 PM

I don't have one, but commercial ammo is available in many bullet weights and it looks like only the 220 grain loads are subsonic. So you might want to consider that possibility.

Roughedge · June 14, 2017, 05:06 PM

I use 125 or 110 grain in Jacketed. I tried some lead 115 powder coated and the leading was so bad it took hours to clean it out. If you're going to use lead I would stay subsonic. When I first built mine I tried some subsonic 220 but without a suppressor the subsonic don't run good.

dallasb · June 14, 2017, 06:26 PM

Quote:

Originally Posted by Wreck-n-Crew

Just curious as to your favorite bullet weight for 300BO. I've been a busy beaver and taken my bullet casting to the next level. I am Building a Casting machine for some mass production and I'm curious as to what people are using in their 300BO.

Thanks.

I use 125gr for super sonic and 190-208 for subsonic.

What rifle do you plan to use it on? Need the specs to give a suggestion for weight.

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Wreck-n-Crew · June 14, 2017, 06:56 PM

I have a load and bullet weight for mine and a buddies AR15's both 16" 1/8 twist one stainless other lined.

i was just curious what others are using as far as weights. Im. Using 155gr coated and CFE Black to keep pressures low under 40,000.

The barrel is broke in to insure the sharp edges in rifling from manufacture dont strip coating and lead the barrel and gas port.

Whisper 300 · June 14, 2017, 07:00 PM

I have 300 Whisper (essentially the precursor to the Blackout) Bolt action w/suppressor.
I initially used 250gr Sierra-yeah, it was a few years back and no longer made but they dropped down to 240 gr- for general use , not hunting, they work fine at 1050 fps.
I use Lehigh and Outlaw States specialty bullets for deer-both are very effective subsonic with massive expansion and fast knock down.
I also cast a 240+/- hollow point Mihec mould bullet but honestly have not used it hunting yet so unable to comment.

I did build an AR in 300 Blk but use that only 125 gr type supersonic bullets-kind of an AR version of the AK very similar ballistics.

Gary

Geezerbiker · June 14, 2017, 07:12 PM

I bought a Lee mold for .32 revolvers. The bullets drop at .310 and about 86 grains. I load these over 2 grains of Red Dot for plinking loads.

Check out the reloading section here for good info on the subject...
http://www.300blktalk.com/forum/

Tony

Bayoubulldog · June 14, 2017, 09:53 PM

It depends on what for, but I favor the Barnes 110 grain Tac TTSX (I believe that's what they call it) for hunting.

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disseminator · June 17, 2017, 09:37 AM

For supersonic loads, I have worked up good loads featuring the Nosler Ballistic Tip at 125 grains. That load is widely recommended for use on game out to 200 yards, though I don't hunt with my 300 so I can't comment on terminal performance on game. But they shoot really great.

For subsonic loads, the cost goes up fast due to the bullet weights. If you are looking for terminal performance, it will be a lot harder with the heavyweights because most are designed for 300 magnum velocities, not subsonic use.

I have had good accuracy and flawless function with both the 210 Nosler ABLR and the Berries 220 grain plated. Get 'em on sale otherwise they are pricey.

My regular plinking load right now is a 150 grain Speer SP that I got on sale: $140 for 1000 from Midway USA. I load these supersonic at around 2000 fps from my 16" AR.

Unconventional · June 18, 2017, 12:55 PM

The solution might depend on the twist rate you're using. For subsonic the 300 BLK can handle the 240 grain SMK's mentioned earlier, but it's believed you'll need the faster 1:7 twist to stabilize them.

The faster twist rates don't seem to adversely affect the lighter supersonic bullets.

I don't use lead cast, but I use Hornady's 225 gr. HPBT Match for subsonic, and Speer TNT 125 gr. for supersonic. I used to use Hornady's 220 gr. RN Interlock in a .308 WIN subsonic load, but the HPBT in 225 gr., while a tad more expensive, is a better bullet for my purposes.

Jeff H · June 20, 2017, 02:17 PM

Mine is just a "fun gun" for 100 yard plinking, nothing serious, so I'm running the cheapest pulled 147 grain bullets that I find for sale.

June 14, 2017, 02:21 PM	#1
Wreck-n-Crew Senior Member Join Date: March 8, 2013 Location: Ohio Posts: 1,820	Favorite Bullet Weight for 300 Blackout? Just curious as to your favorite bullet weight for 300BO. I've been a busy beaver and taken my bullet casting to the next level. I am Building a Casting machine for some mass production and I'm curious as to what people are using in their 300BO. Thanks. __________________ If you ever have to use a firearm, *you don't get to pick the scenario!*

June 14, 2017, 03:54 PM	#2
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,063	I don't have one, but commercial ammo is available in many bullet weights and it looks like only the 220 grain loads are subsonic. So you might want to consider that possibility. __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle

June 14, 2017, 05:06 PM	#3
Roughedge Senior Member Join Date: January 24, 2011 Location: Monroe,NC Posts: 669	I use 125 or 110 grain in Jacketed. I tried some lead 115 powder coated and the leading was so bad it took hours to clean it out. If you're going to use lead I would stay subsonic. When I first built mine I tried some subsonic 220 but without a suppressor the subsonic don't run good. __________________ The man that die's with the most stuff win's!

June 14, 2017, 06:56 PM	#5
Wreck-n-Crew Senior Member Join Date: March 8, 2013 Location: Ohio Posts: 1,820	I have a load and bullet weight for mine and a buddies AR15's both 16" 1/8 twist one stainless other lined. i was just curious what others are using as far as weights. Im. Using 155gr coated and CFE Black to keep pressures low under 40,000. The barrel is broke in to insure the sharp edges in rifling from manufacture dont strip coating and lead the barrel and gas port. __________________ If you ever have to use a firearm, *you don't get to pick the scenario!*

June 18, 2017, 12:55 PM	#10
Unconventional Member Join Date: February 27, 2017 Posts: 81	What's your twist rate? The solution might depend on the twist rate you're using. For subsonic the 300 BLK can handle the 240 grain SMK's mentioned earlier, but it's believed you'll need the faster 1:7 twist to stabilize them. The faster twist rates don't seem to adversely affect the lighter supersonic bullets. I don't use lead cast, but I use Hornady's 225 gr. HPBT Match for subsonic, and Speer TNT 125 gr. for supersonic. I used to use Hornady's 220 gr. RN Interlock in a .308 WIN subsonic load, but the HPBT in 225 gr., while a tad more expensive, is a better bullet for my purposes. __________________ Unconventional

June 14, 2017, 07:00 PM	#6
Whisper 300 Senior Member Join Date: December 29, 2006 Posts: 155	I have 300 Whisper (essentially the precursor to the Blackout) Bolt action w/suppressor. I initially used 250gr Sierra-yeah, it was a few years back and no longer made but they dropped down to 240 gr- for general use , not hunting, they work fine at 1050 fps. I use Lehigh and Outlaw States specialty bullets for deer-both are very effective subsonic with massive expansion and fast knock down. I also cast a 240+/- hollow point Mihec mould bullet but honestly have not used it hunting yet so unable to comment. I did build an AR in 300 Blk but use that only 125 gr type supersonic bullets-kind of an AR version of the AK very similar ballistics. Gary

June 14, 2017, 07:12 PM	#7
Geezerbiker Senior Member Join Date: March 20, 2011 Location: Willamina, OR Posts: 1,908	I bought a Lee mold for .32 revolvers. The bullets drop at .310 and about 86 grains. I load these over 2 grains of Red Dot for plinking loads. Check out the reloading section here for good info on the subject... http://www.300blktalk.com/forum/ Tony

June 14, 2017, 09:53 PM	#8
Bayoubulldog Member Join Date: January 31, 2016 Posts: 48	It depends on what for, but I favor the Barnes 110 grain Tac TTSX (I believe that's what they call it) for hunting. Sent from my SAMSUNG-SM-G930A using Tapatalk

June 17, 2017, 09:37 AM	#9
disseminator Senior Member Join Date: November 26, 2016 Location: Minnesota Posts: 960	For supersonic loads, I have worked up good loads featuring the Nosler Ballistic Tip at 125 grains. That load is widely recommended for use on game out to 200 yards, though I don't hunt with my 300 so I can't comment on terminal performance on game. But they shoot really great. For subsonic loads, the cost goes up fast due to the bullet weights. If you are looking for terminal performance, it will be a lot harder with the heavyweights because most are designed for 300 magnum velocities, not subsonic use. I have had good accuracy and flawless function with both the 210 Nosler ABLR and the Berries 220 grain plated. Get 'em on sale otherwise they are pricey. My regular plinking load right now is a 150 grain Speer SP that I got on sale: $140 for 1000 from Midway USA. I load these supersonic at around 2000 fps from my 16" AR.

June 20, 2017, 02:17 PM	#11
Jeff H Senior Member Join Date: August 20, 2009 Posts: 176	Mine is just a "fun gun" for 100 yard plinking, nothing serious, so I'm running the cheapest pulled 147 grain bullets that I find for sale.