Results of H50BMG in a .264 Win. Mag.

[Lee in OH]

Submitted for those of you that may be of interest.

OK..here's the data....

140 grain SMK
RP neck sized brass
Federal 210M primers
Temp. - 35 degrees

65.0 gr. - 2950 fps
66.0 gr. - 3014 fps
67.0 gr. - 3030 fps
68.0 gr. - 3053 fps
69.0 gr. - 3048 fps
70.0 gr. - 3091 fps
71.0 gr. - 3147 fps
72.0 gr. - 3136 fps
73.0 gr. - 3169 fps
74.0 gr. - 3205 fps
75.0 gr. - 3218 fps
76.0 gr. - 3242 fps
77.0 gr. - 3269 fps compressed charge

I like how the powder gives low increases of velocity between 1 grain charges. That tells me that small deviations in powder charges will have little effect on velocity and should return a nice low standard deviation. Also, the case can be jam packed with the stuff and it won't blow your rifle up and still gives very good velocity. There are other powders that will drive a 140 grain pill faster, but accuracy kills far better than speed.

Overall, I feel that H50BMG is a very good powder in magnum cases and is very overlooked as a viable powder to use in this class of cartridges.

You may have noticed that at times greater charges returned lower velocities. It has been my experience that this does happen from time to time, most likely a result of case wear and preparation. My cases are not prepared to BR standards.

 

[DANTEC]

thanks for the imput

what barrel lenght do you use in your 264 win

in my 6.5/300 DTC YUMA ( 264 WIN mag long neck )30 inch barrel

I get 3350 with a 139 Scenar and 5.15 gramme ( 79.5 grain ) case full powder is Nobel SP13 ( commercial name of belgium mage PCL 9520 wwich is slow BMG or fast 20 mm powder ) , fed 210 M primer , case form in 300 WIN MAG .

good shooting

DAN TEC

 

[Lee in OH]

It's a 28" Pac-Nor.

Seems like that 6.5 300 hums right along. I may try an even slower powder than the 50BMG just for kicks, but I'll probably have to order it special. Heck, I couldn't even get the H50BMG around here, I had to drive an hour and a half to get it.

Just noticed possibly confusing information. The temp here was 35 farenheit, not -35. The dash was a spacer. Not a good idea in hindsight.

Did you see an increase in accuracy using the full case of Nobel powder as opposed to a partial case of something else??? That's why I'm experimenting with the really slow stuff.

thanks.

 

[flashfishing]

I am going to try H50 BMG with Berger 156gr EOL Elite Hunter Match.
I have a custom 264 Win Mag with a Proof barrel. Not sure if I will use Fed 210s or 215s.
Steve

 

[flashfishing]

Berger, we talked yesterday about H50BMG loads for my custom 264 Win Mag. I had the 264 Win Mag built on a Ruger M77 tang safety action with a 26in Proof barrel. I had a 300 PRC built so I did not have a use for my 300 Win Mag any more. You gave me a range of 68grs to 71.6grs and COL at 3.340 for 156gr EOL Elite Hunter Match bullets. I used brand new Winchester untuned brass. I used Fed 215 primers and due to my magazine restrictions I seated the bullets to 3.308 COL. I started with a 67.0 charge of H50BMG. I worked my way up to 71grs. I did not experience any pressure signs. I found the best groups at 69.0 grs and 70.0 grs. 69.0grs produced a .406 MOA group and 70.0 produced a .330 MOA group. I am not sure at what speed I am sending the bullets yet. I will chronograph them next time. I was more concerned about accuracy first. I am very pleased with the performance. Now I have a use for the 6 pounds of H50BMG powder I have. I also shot a few groups out of my 6.5-06 AI. Your 140gr Elite Hunter bullets produced some great group. Thanks again Berger.
Steve Talmadge

 

[cjuve]

Pretty interested to see the velocities on those 156 Berger's.I would imagine that there is still some room before you hit pressure considering that I have run up to 67.5gr. of retumbo in mine.

 

[Rifleman97]

My experience with H50bmg and US869 (similar burn rates) is that they provide incredible velocity in most overbore magnums at the cost of horrendous temp instability.

US 869 In my 300 rum my data sheet from my own testing said I had to give up 1.8 fps for every degree F under 70°f baseline. Data sheet says 1.68 but my testing was in a 300 rum so the extra powder That means making a load at 70° and hunting at 0° You lose 115-140 FPS. That's the reason I don't use it unless there's a powder scarcity (like now) because it's less desirable than many other magnum powders.

H50bmg has a temp stability of 1.6fps per degree. A tad better, but not suitable for long range hunting applications in my opinion. They work great for practice loads when you're trying to conserve unicorn dust (N570) but they're not stable enough for me to trust for LR work.

Good information to have in this powder shortage for sure, just be warned

 

[Hespco]

Interesting. I have always got a higher velocity in my 264's & 140gr Sierra's with VV24N41. 50 BMG has always been a bit slower. My best, safe load with the 140 Sierra & VV23N41, 3228fps, 26" bbl.

 

[grouse]

I heard they had discontinued this powder?

 

[GrayCreed]

Berger, we talked yesterday about H50BMG loads for my custom 264 Win Mag. I had the 264 Win Mag built on a Ruger M77 tang safety action with a 26in Proof barrel. I had a 300 PRC built so I did not have a use for my 300 Win Mag any more. You gave me a range of 68grs to 71.6grs and COL at 3.340 for 156gr EOL Elite Hunter Match bullets. I used brand new Winchester untuned brass. I used Fed 215 primers and due to my magazine restrictions I seated the bullets to 3.308 COL. I started with a 67.0 charge of H50BMG. I worked my way up to 71grs. I did not experience any pressure signs. I found the best groups at 69.0 grs and 70.0 grs. 69.0grs produced a .406 MOA group and 70.0 produced a .330 MOA group. I am not sure at what speed I am sending the bullets yet. I will chronograph them next time. I was more concerned about accuracy first. I am very pleased with the performance. Now I have a use for the 6 pounds of H50BMG powder I have. I also shot a few groups out of my 6.5-06 AI. Your 140gr Elite Hunter bullets produced some great group. Thanks again Berger.
Steve TalmadgeView attachment 253223

You and me got the same stock

 

[Rifleman97]

I heard they had discontinued this powder?

They did. But since it REALLY didn't sell well, I still see some available on shelves (one of the only things left) and people still have it. So it's data is still beneficial to have for a couple years, similar to 872 before US869 replaced that.

People worried that the spherical based powder of 869 will be far warse temp stability than the extruded 50bmg, but honestly they were fairly close in temp sensitivity and burn rate to begin with.

 

[GrayCreed]

They did. But since it REALLY didn't sell well, I still see some available on shelves (one of the only things left) and people still have it. So it's data is still beneficial to have for a couple years, similar to 872 before US869 replaced that.

People worried that the spherical based powder of 869 will be far warse temp stability than the extruded 50bmg, but honestly they were fairly close in temp sensitivity and burn rate to begin with.

So it's close to us869?
I'm using 869 in 7mag

 

[Hespco]

5010, 50 BMG, the same powder?? I have close to 15lbs of it.

 

[Rifleman97]

So it's close to us869?
I'm using 869 in 7mag

Yes, the burn rate is pretty close.