Extruded/Temp Stable Powders for 300BLK

[Onyx Z]

I typically use H110 for my 300BLK loads, but the inconsistency with changing temperatures forced me to put it down for hunting. I need my rifle to shoot the same whether it's 30* or 70* and H110 is not doing that for me. It's fine for plinking, but it is all over the place in changing temperatures.

These days, I only use extruded powders for their temperature stability for precision and hunting loads, so I'm looking for something that works well in 300BLK. I know IMR4227 is an extruded powder, but I'm not sure on the temp stability of it. It has to be better than H110. Anyone have any experience with it?

[bigedp51]

In the past ball powders were double base powders and extruded powders were single base powders. Today this is no longer true and as an example the new Enduron "extreme" powders are double base powders.

Queston, are you using a magnum primer and crimping with your Blackout rounds. I do not have a 300 Blackout but I do use H110/296 in my .44 magnum and a magnum primer and a firm crimp is required for uniform pressures.

NOTE, the Hodgdon Lil'Gun powder used below is also double base like your H110.

Handloading the .300 AAC Blackout
http://www.shootingillustrated.com/articles/2014/6/17/handloading-the-300-aac-blackout/

[Onyx Z]

Yes, I am lightly crimping with a LEE FC die. No magnum primer, but this shouldn't matter in regards to temperature stability. The rifle shot exceptionally well in the conditions I did my load development in (~1moa @ 60*) but horribly in 30* weather with the same lot of components in both scenarios. Both were from a bench with a clean barrel that, in my experience, the Barnes bullets like. I tried Lil-Gun but it burns hotter than I would like in my rifle.

I have never heard of a single base ball powder... the Enduron powder I've used are all extruded (IMR 4166).

Bullet: Barnes TAC-TX
Primer: CCI 400

I'm thinking the low case capacity kind of rules out the extruded powders...

[bigedp51]

Double base powders contain nitroglycerin and have more deterrent coatings to regulate the burn rate. All double base powders should use a magnum primer, just as the military does with all its double base ball powders. In cold weather a magnum primer is needed to light off the harder to ignite double base ball powders. And this may be causing your problem with your H110 and temp stability.

I didn't say anything about a "single base ball powder" so I'm not sure where the confusion came from.

Below is a "subtle hint", Remington ran Lake City from 1941 till 1982 and during that time all 5.56 ammunition loaded at Lake City used the Remington7 1/2 primer.
There is a reason they are called baby flame throwers, and why I use them with all my AR15 ball powder loads.

http://i122.photobucket.com/albums/o254/bigedp51/3CCIBR4_zps20b88c85.jpg

http://i122.photobucket.com/albums/o254/bigedp51/1Federal205M_zpsa4b4dbfe.jpg

http://i122.photobucket.com/albums/o254/bigedp51/5Remington75_zps2b532d7c.jpg

Down here on the farm we throw in a little caster oil and Remington 7 1/2 primers in the cattle feed to clear up gastrointestinal problems. (really no shit)

http://i122.photobucket.com/albums/o254/bigedp51/cow_zps8715d784.jpg

[mic2377]

There isn't a great selection of powders that fit your criteria, in this burn rate. There are lots of temp stable "Extreme" powders for medium rifle, but alot less suitable for 300 BLK.

I would give something like Vithavouri N110 or IMR 4227 a try. While neither is an "extreme" series Hodgdon powder, they are both single base and will be significantly less temp sensitive than a double base ball powder. Also N110 is extremely clean burning.

[Onyx Z]

There isn't a great selection of powders that fit your criteria, in this burn rate. There are lots of temp stable "Extreme" powders for medium rifle, but alot less suitable for 300 BLK.

I would give something like Vithavouri N110 or IMR 4227 a try. While neither is an "extreme" series Hodgdon powder, they are both single base and will be significantly less temp sensitive than a double base ball powder. Also N110 is extremely clean burning.

I've always heard N110 is the same as H110? I've never seen it, so I have no idea. I thought about giving IMR4227 a try a while back, but H110 was being good to me... then it got cold.

[mic2377]

N110 is an extruded powder, so I would assume it is different. I know the other N100-series powders are single base extruded, so I would assume it has a similar composition.

[Onyx Z]

N110 is an extruded powder, so I would assume it is different. I know the other N100-series powders are single base extruded, so I would assume it has a similar composition.

Looks like I'm gonna need to pick some up then.