100 grain 300 blackout reload info

[Matthew Schwind]

Hello All! My first post and I am wondering if anyone has any information or starting points for a round I am trying to reload.

I'm using the following:

Lapua 100 grain 30 caliber bullet
300 blackout brass
Winchester or CCI small rifle primers
Either Alliant 300 MP (which I'm told is similar to H110)
Or... H335
Or... RX15 (Alliant Reloder 15)
OPEN TO IDEAS ON WHICH OF THESE THREE IS BEST...

Lastly and most importantly I'm at a loss for a starting point on this load... closest I can find is a Hornady V-Max 110 grain bullet which calls for H110 starting with 19.0 grains of powder...

So I'm wondering with a slightly lighter bullet being 100 grains should I stick with 19.0 grains of powder or do a little more or less as a starting point?

Rookie re-loader in need of advice!!!

 

[Blue68f100]

I don't load for the 300 BO so this is a general statement on recommended charging using a heavier bullet.

You can always use the next heavier weight if it's the same construction and profile. You will be a little light so don't load very many till you test them. Then workup your load. W296/H110 does not down load very well and does require a Mag Primer for hand guns. I don't know if a std SR primer will give you consistent results. A crony will tell you if you have one.

Why such a light bullet?

 

[Texas10mm]

H335 and RL 15 ARE NOT suitable powders for 300 Blackout.

On a burn rate chart the powders for 300 Blk are in the 63 to 72 range. http://bulletin.accurateshooter.com/2018/08/get-latest-powder-burn-rate-chart-here/

335 at #83 and RL15 at #100 are WAY TOO slow.

Treat the 300 Blk as a magnum pistol not a rifle.

A magnum primer is not required for H110/296 in the 300 Blk.

One can use the data for the next heavier bullet weight as a starting point for a lighter bullet.

The best powders for light bullets in the 300 Blk are H110/296, MP 300, Shooter's World Heavy Pistol, N110, and Accurate 11 FS.

Note these are all powders that work quite well in heavy .44 Mag loads. Magnum pistol powders.

 

[Matthew Schwind]

I don't load for the 300 BO so this is a general statement on recommended charging using a heavier bullet.

You can always use the next heavier weight if it's the same construction and profile. You will be a little light so don't load very many till you test them. Then workup your load. W296/H110 does not down load very well and does require a Mag Primer for hand guns. I don't know if a std SR primer will give you consistent results. A crony will tell you if you have one.

Why such a light bullet?

I found the lighter bullet on sale and it was unique as there are not alot of 100 grain 30 cal or 308 rounds so I am hoping to achieve a faster velocity. Something to experiment with and see what happens

 

[Matthew Schwind]

H335 and RL 15 ARE NOT suitable powders for 300 Blackout.

On a burn rate chart the powders for 300 Blk are in the 63 to 72 range. http://bulletin.accurateshooter.com/2018/08/get-latest-powder-burn-rate-chart-here/

335 at #83 and RL15 at #100 are WAY TOO slow.

Treat the 300 Blk as a magnum pistol not a rifle.

A magnum primer is not required for H110/296 in the 300 Blk.

One can use the data for the next heavier bullet weight as a starting point for a lighter bullet.

The best powders for light bullets in the 300 Blk are H110/296, MP 300, Shooter's World Heavy Pistol, N110, and Accurate 11 FS.

Note these are all powders that work quite well in heavy .44 Mag loads. Magnum pistol powders.

Awesome response thank you for the information and insight. Thankfully I also have a 30-30 I reload for and can use the other powders for that, but I have a bunch of MP 300 so that'll work nicely and I can start at the recommended load for the 110 grain bullet. Thanks again for the insight!

 

[Matthew Schwind]

H335 and RL 15 ARE NOT suitable powders for 300 Blackout.

On a burn rate chart the powders for 300 Blk are in the 63 to 72 range. http://bulletin.accurateshooter.com/2018/08/get-latest-powder-burn-rate-chart-here/

335 at #83 and RL15 at #100 are WAY TOO slow.

Treat the 300 Blk as a magnum pistol not a rifle.

A magnum primer is not required for H110/296 in the 300 Blk.

One can use the data for the next heavier bullet weight as a starting point for a lighter bullet.

The best powders for light bullets in the 300 Blk are H110/296, MP 300, Shooter's World Heavy Pistol, N110, and Accurate 11 FS.

Note these are all powders that work quite well in heavy .44 Mag loads. Magnum pistol powders.

So I'm looking in the Lyman 50th Edition and it says 110 gr. HORNADY V-MAX with H110 (I'll be using 300-MP) they recommend 19.0 starting grains. Does that seem about right?

 

[CarJunkieLS1]

If your using 300-MP powder then you need to use 300-MP data.

 

[Matthew Schwind]

If your using 300-MP powder then you need to use 300-MP data.

Easier said than done, they don't have any data for a 300 blackout bullet that is 100 grains with 300-MP

 

[Texas10mm]

Easier said than done, they don't have any data for a 300 blackout bullet that is 100 grains with 300-MP

Check over at http://www.300blktalk.com/ there are a couple of guys over there that have done some work with 300-MP.

 

[kcofohio]

https://load-data.nosler.com/load-data/300-aac-blackout/
Nosler list 300-MP with their 110 gr. bullet.
Starting charge 18.5 gr. and max 20.5 gr.

 

[Matthew Schwind]

https://load-data.nosler.com/load-data/300-aac-blackout/
Nosler list 300-MP with their 110 gr. bullet.
Starting charge 18.5 gr. and max 20.5 gr.

PERFECT! Thanks for taking the time to post and share! Super helpful, now I have a starting point.

 

[kcofohio]

You're welcome! I know how difficult it can be finding data for a newish powder and/or bullet.

 

[kcofohio]

PERFECT! Thanks for taking the time to post and share! Super helpful, now I have a starting point.

Where are my manners?
Matthew, welcome to THR!

 

[Jake in TX]

Also, in the downloadable reloaders' guide from Alliant Powder, they show a max charge of 20.9 grains of Power Pro 300MP for a 110 grain Federal SPRN. Page 85.

And, welcome to THR.

Jake

 

[Matthew Schwind]

Also, in the downloadable reloaders' guide from Alliant Powder, they show a max charge of 20.9 grains of Power Pro 300MP for a 110 grain Federal SPRN. Page 85.

And, welcome to THR.

Jake

Is that for 300 blackout brass?

 

[Jake in TX]

They list it for 300 Blackout. You can download their guide in PDF format from https://www.alliantpowder.com/products/default.aspx It's toward the lower right.

Jake

 

[Highland Lofts]

Some good information here on the 300 blackout.