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Starting loads for 300 ultra and retumbo

 
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  #8  
Old 09-20-2005, 10:17 PM
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Re: Starting loads for 300 ultra and retumbo

There are a ton of loads out there for the 300 ultra. It seems the most popular for hunting rifles depend on Retumbo or RL 25 for powder. Educate yourself on max loads for the 300 and drop 10% for starting loads. Get a good Chrono and start working up your load watching for pressure signs as you increase your charges. Beware if you are getting 100 to 200 fps more than anyone else similiarly equipped. You may be too hot. On the Rem brass, loads too warm will usually loosen primer pockets real fast. The Rem ejector will make its mark known on the case head too; but this is not all that reliable. I've had factory loads do this before.
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  #9  
Old 09-20-2005, 11:14 PM
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Re: Starting loads for 300 ultra and retumbo

Hi this is the Published data by ADI that devolped Retumbo especialy for the 300 RUM i shoot with one of the balastitions that works at ADI the data is as follows.

ADI AR2225 (Retumbo)
300 Remington Ultra Mag

Start, Vel, Pres, Max, Vel, Pres
190gr
90.0gr 3069fps, 56500psi, 96.0gr, 3204fps, 62500psi

200gr
81.0gr 2852fps, 56200psi, 86.0gr, 2988fps, 62800psi

220gr
84.0gr 2800fps, 56600psi, 89.0gr, 2905fps, 61900fps.

all data in a 24" test barrel

Hope it helps

Cheers Bill
Australia
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  #10  
Old 09-21-2005, 07:10 AM
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Re: Starting loads for 300 ultra and retumbo

Thanks for that info guys.
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  #11  
Old 09-21-2005, 03:17 PM
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Join Date: Jul 2004
Location: OHIO
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Re: Starting loads for 300 ultra and retumbo

Did you look at Hodgdon's website? They have some info there.
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Derek M.
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  #12  
Old 09-21-2005, 03:36 PM
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Join Date: Jan 2005
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Re: Starting loads for 300 ultra and retumbo

Yeah I looked at it but they didn't have the specific bullets I wanted to shoot. I didn't know enough about the different bearing surfaces of these bullets to figure what the load should be. I finally called sierra and they said they got up to 89.5 with the 220. I have worked up to 87.5 with the 220, and 89 with the 210berger. Accuracy has been excellent, due to Kirby's work. I've got the berger shooting under 1" at 300, and the matchking right at 1" at 300. With some work on the seating depth I think I can bring them both down to about
.75 inches.
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