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Retumbo or H50BMG in 32" 300 RUM?

 
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  #1  
Old 09-02-2013, 06:21 PM
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Retumbo or H50BMG in 32" 300 RUM?

I just got my new full custom 300 Rum back from the gunsmith a few days ago. The barrel is a 9 twist Broughton 5C 32" finished length. I have a custom match diameter, very long throat. I am in the process of barrel break in and speed/pressure testing with Retumbo. I will start tuning for a load in the next several days. What I have discovered so far is that max load at a seating depth of 3.820" (to fit in my mag) is right at 94 grains of Retumbo. This produces 3130fps. I get the infamous Retumbo pressure spike at 95 grains. I am curious if I should steer towards H50BMG with this long barrel and throat. Does anyone have experience with this combo in extra long barrels? My gunsmith did comment that I may need H50BMG for the best velocity potential from 32". 3100fps with the 230 is very respectable but if H50BMG seems a better option I am willing to pick some up and try it. I did load two rounds up tonight with 93.5 grains of Retumbo at a seating depth of 3.950" to see what the pressure and velocity does compared to the deeper seating depth. Thanks
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Old 09-02-2013, 06:26 PM
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Re: Retumbo or H50BMG in 32" 300 RUM?

i could be wrong but you have the potential of getting more velo but you might get large velocity spreads. try it whats the worse that could happen
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Old 09-02-2013, 06:55 PM
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Re: Retumbo or H50BMG in 32" 300 RUM?

I've loaded for the 210's and I could only get 93 gr with the them. I'm surprised you're getting 94 gr before pressuring out with the 230's. The 230's do have a shorter bearing surface but they are also 20 gr heavier.

Anyway, I'll be testing the 230's with RL33 in my new RUM. From what I've read it looks a very good combo that should give close to 100% case capacity with good velocity. I've also read that QL list it at about the same burn rate as 50 BMG. You could try both and see what happens... it's only barrel life
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Old 09-02-2013, 07:08 PM
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Re: Retumbo or H50BMG in 32" 300 RUM?

Stick with Retumbo. Alternatively, consider trying H1000. Like you, I have a 32" 300RUM and have tried H50BMG and while accuracy was outstanding, velocities were very low (~2750 as I recall).

Also, your barrel is brand new. As you shoot it, you will find that it will speed up. My rifle started out shooting the 208Amax at 3150. Without changing anything about my load it has steady crept up to 3275.

You can read about my rifle here:

My 300RUM by MCR

Show us some pics of your shootin' stick!
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Old 09-02-2013, 07:16 PM
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Re: Retumbo or H50BMG in 32" 300 RUM?

Quote:
Originally Posted by trebark View Post
Stick with Retumbo. Alternatively, consider trying H1000. Like you, I have a 32" 300RUM and have tried H50BMG and while accuracy was outstanding, velocities were very low (~2750 as I recall).

Also, your barrel is brand new. As you shoot it, you will find that it will speed up. My rifle started out shooting the 208Amax at 3150. Without changing anything about my load it has steady crept up to 3275.

You can read about my rifle here:

My 300RUM by MCR

Show us some pics of your shootin' stick!
Thanks Trebark! This is what I needed to hear about the H50BMG. I know that my speeds will increase as the barrel wears in, this happened with the last barrel that was on the rifle too. I have 1.5 lbs of H1000 that is "designated" to be used in the kids' 300 H&H pushing the 215 hybrids. As hard as H1000 is to come by I think I'll stick with Retumbo unless I can't pull accuracy with low ES from it.
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Old 09-02-2013, 07:26 PM
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Re: Retumbo or H50BMG in 32" 300 RUM?

Quote:
Originally Posted by Tumbleweed View Post
Thanks Trebark! This is what I needed to hear about the H50BMG. I know that my speeds will increase as the barrel wears in, this happened with the last barrel that was on the rifle too. I have 1.5 lbs of H1000 that is "designated" to be used in the kids' 300 H&H pushing the 215 hybrids. As hard as H1000 is to come by I think I'll stick with Retumbo unless I can't pull accuracy with low ES from it.
Sssshhhh...don't tell anybody but I have 8lbs of H1000 sitting on my shelf that's not being used! I tried Retumbo and H1000 in my rifle and got best performance from Retumbo so the H1000 just sits collecting dust (or another rifle build??)

How big is your kid that can shoot a 300 ouch & ouch? or does it have a brake the size of a boxcar on it?
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Old 09-02-2013, 10:29 PM
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Re: Retumbo or H50BMG in 32" 300 RUM?

Quote:
Originally Posted by trebark View Post
Sssshhhh...don't tell anybody but I have 8lbs of H1000 sitting on my shelf that's not being used! I tried Retumbo and H1000 in my rifle and got best performance from Retumbo so the H1000 just sits collecting dust (or another rifle build??)

How big is your kid that can shoot a 300 ouch & ouch? or does it have a brake the size of a boxcar on it?
My boys are 11 and 12 right now. They were actually shooting my braked RUM at 8 and 9 years old out to 950 yards and did surprisingly well even then. They would keep on burning powder if I kept giving them shells! And yes, the H&H has a break on it. In fact I just let them shoot it today at 800 yards and they did their part. Dad just needed to be a little better on giving them their wind holds in a shifting wind Feel blessed that you have 8lbs of H1000!!!
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