300 Blackout / H110 low burnt powder

[6Creed73]

Wondering if someone can run this through Quickload to see if it matches the 77% burnt propellant that GRT shows.

If I keep everything the same and just change the powder from H110 to Lil Gun, the burnt proppellant goes to 93%. This makes no sense to me because those two powders have a very similar burn rate.

I also changed from a 8.5" barrel to 16" and it still shows H110 with a burnt propellant warning.

110 V-Max
Seating Depth 2.050
H110, 17.1gr
8.5" barrel
7 twist

 

[dhagerty40]

here is Quickload...

 

[MisterHelix]

I don’t have quickload, but I’ve put 19 grains of h110 under thousands of 110 grain nosler varmageddons at about 2.065” OAL.

I guess I don’t understand the question, but I’m slow like that.

 

[6Creed73]

here is Quickload...View attachment 1517086

Thank you very much for this. Looks like QL is estimating a bit more powder is being burnt, but still than I would expect.

 

[6Creed73]

I don’t have quickload, but I’ve put 19 grains of h110 under thousands of 110 grain nosler varmageddons at about 2.065” OAL.

I guess I don’t understand the question, but I’m slow like that.

The question is about how much powder is estimated to be burnt. According to GRT, 23% of the powder doesn't get burnt. QL says 15% of the powder doesn't get burnt. Both of those estimates indicate this an inefficient combination, and I'll probably just choose a different powder.

 

[dellet]

Thank you very much for this. Looks like QL is estimating a bit more powder is being burnt, but still than I would expect.

Considering it’s a minimum load in 8.5” barrel, I’m surprised it’s burning 85%.

What you have is probably the best powder bullet combination available for the cartridge. The problem is it’s a piss poor load. Take the load density to 90% minimum. At 95% you’ll get some pretty good results. It’s very very I,portant to use the actual case capacity of you brass. Not the full grain difference between the GRT load and the Quickload data. That much difference in this cartridge, with that powder bullet combination is the difference between throwing the powder away and going to buy an #8 pounder.

 

[6Creed73]

Considering it’s a minimum load in 8.5” barrel, I’m surprised it’s burning 85%.

What you have is probably the best powder bullet combination available for the cartridge. The problem is it’s a piss poor load. Take the load density to 90% minimum. At 95% you’ll get some pretty good results. It’s very very I,portant to use the actual case capacity of you brass. Not the full grain difference between the GRT load and the Quickload data. That much difference in this cartridge, with that powder bullet combination is the difference between throwing the powder away and going to buy an #8 pounder.

Thanks, Dellet. I actually did map out a load near max, and everything in between. None of it looks great. At 19.7gr, it's still only burning 87% of the propellant...and puts it in dangerous pressure area, according to GRT at least. I'd prefer to be over 95% density, I like a lightly compressed load...but nothing I mapped out was very promising. I wasn't looking to use the difference between GRT and QL...I was just skeptical of what GRT was showing so I wanted to know if QL was the same.

I understand less powder will get burnt with an 8.5" barrel, but I don't have this issue with other powders, like Lil Gun. I like H110, it's what I use for pretty much all my supers. But this is my first time with this bullet. Not sure why GRT is coming to these conclusions...but I have several other powders to choose from. So it's probably not worth spending a bunch of time on.

 

[dellet]

Something is wrong with GRT. All of the numbers look reasonably close to what I would except the powder burn.

A couple things to note. Your max load of 19.7 is compressed at 103%. Change that two ways and watch the pressure. Keep your seated depth as is and change density to 99%. The move the bullet out until your density is 99%. Watch pressures and velocities.

H110 gets a bit unpredictable above 100% density.

Change your powder to 296. Look at the numbers, specifically burn percent.

For what it’s worth, Hornady data COL 2.050” minimum H110 16.6 max 20.2.
296 16.7 min 19.9 max.

Regardless, 95% will be about max in an 8.5”, but no reason it should be under 90%

 

[6Creed73]

Something is wrong with GRT. All of the numbers look reasonably close to what I would except the powder burn.

A couple things to note. Your max load of 19.7 is compressed at 103%. Change that two ways and watch the pressure. Keep your seated depth as is and change density to 99%. The move the bullet out until your density is 99%. Watch pressures and velocities.

H110 gets a bit unpredictable above 100% density.

Change your powder to 296. Look at the numbers, specifically burn percent.

For what it’s worth, Hornady data COL 2.050” minimum H110 16.6 max 20.2.
296 16.7 min 19.9 max.

Regardless, 95% will be about max in an 8.5”, but no reason it should be under 90%

Thanks again. I'm going to try this.

 

[6Creed73]

No matter what I tried, GRT shows burnt propellant at about 85% for H110 and pressures aittle high for my liking. But I'm going to load some up with densities between 95% - 99%, like @dellet mentioned, and just see how they perform. Usually GRT is pretty accurate for me, but I have a hard time believing the calculations in this scenario.

I'm also going to load up some with Li Gun. Even with the 8.5" barrel, GRT shows Lil Gun burning close to 100%. This is what has me questioning GRTs calculations, because H110 and Lil Gun are really close on the burn rate charts. The load below with Lil Gun looks really good...so I'll have a shoot out between the two and see which one I like better. This will be a coyote load...going strictly by GRT, the Lil gun load has the velocity, density, and burn rate I want and looks like a winner.

 

[MGYSGT]

I shoot mine subsonic. I use CCI450 primers. Don't know if it helps, but they shoot good.

 

[dellet]

No matter what I tried, GRT shows burnt propellant at about 85% for H110 and pressures aittle high for my liking. But I'm going to load some up with densities between 95% - 99%, like @dellet mentioned, and just see how they perform. Usually GRT is pretty accurate for me, but I have a hard time believing the calculations in this scenario.

I'm also going to load up some with Li Gun. Even with the 8.5" barrel, GRT shows Lil Gun burning close to 100%. This is what has me questioning GRTs calculations, because H110 and Lil Gun are really close on the burn rate charts. The load below with Lil Gun looks really good...so I'll have a shoot out between the two and see which one I like better. This will be a coyote load...going strictly by GRT, the Lil gun load has the velocity, density, and burn rate I want and looks like a winner.

View attachment 1517309

What happened when you substitute 296 for H110?

 

[6Creed73]

What happened when you substitute 296 for H110?

Oh yeah, forgot to post those screenshots. Only substituting those powders, 296 goes from 97% density to 109% and burnt powder stays the same.

 

[lb-ft]

I’m confused. I’ve read myriad times 296 and H110 are same stuff in different packaging.

 

[dellet]

Oh yeah, forgot to post those screenshots. Only substituting those powders, 296 goes from 97% density to 109% and burnt powder stays the same.

View attachment 1517371

View attachment 1517372

Something is wrong with the program. It’s the exact same powder.

Double check your inputs to be sure.