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Idea for Retumbo in 7mm SAUM. What do you think?

 
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  #1  
Old 08-30-2009, 08:50 PM
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Idea for Retumbo in 7mm SAUM. What do you think?

I'm trying to find a starting point for load development for my custom 7mm SAUM. Is a slow burning powder, like Retumbo, a good choice for 168gr Bergers and a 28" barrel? If not, what do you suggest? I was also considering RL-17, but it's faster burning. Any ideas?
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Old 08-30-2009, 11:06 PM
VTi VTi is offline
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Re: Idea for Retumbo in 7mm SAUM. What do you think?

I spent a good deal of time experimenting with Retumbo in a longer bbl (28") 7wsm with the even heavier bullets - 180gr Berger VLD.

I arrived at the conclusion that it did not work that well. It was consistent, but I could not push the velocity to the point I was looking for (3100fps +) and still maintain a COAL of 2.860" to easily feed out of AI mags. I got to about 3000fps, no pressure signs at all, but the powder was getting way to compressed for my liking so I didn't want to go any higher with the charges.

Finally, I stepped down to H1000 and got fantastic results. I shoot several different 7wsm's and strongly believe H1000 is the single best propellant for the 7wsm and heavier bullets.

Just my opinion, YMMV of course.

Last edited by VTi; 08-31-2009 at 07:55 AM.
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Old 08-30-2009, 11:12 PM
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Re: Idea for Retumbo in 7mm SAUM. What do you think?

I have never loaded for the 7 saum but my guess is way to slow for that cartridge. Try something faster.
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Old 08-31-2009, 06:50 AM
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Re: Idea for Retumbo in 7mm SAUM. What do you think?

Ryan, I would think H4831sc and may-be H1000 would give good results.
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Old 08-31-2009, 07:42 AM
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Re: Idea for Retumbo in 7mm SAUM. What do you think?

Another vote for H-1000. 168 Bergers, 2.850" OAL, 65 gr and getting 3065 fps.
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Old 08-31-2009, 07:59 AM
VTi VTi is offline
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Re: Idea for Retumbo in 7mm SAUM. What do you think?

What's the barrel twist? If it's 1:9 or faster, just go straight to the 180 VLD's. I assume you're taking this rig well out past 1000yds, and the 180's ballistics are much superior at those distances.
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Old 08-31-2009, 05:07 PM
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Re: Idea for Retumbo in 7mm SAUM. What do you think?

Quote:
Originally Posted by VTi View Post
What's the barrel twist? If it's 1:9 or faster, just go straight to the 180 VLD's. I assume you're taking this rig well out past 1000yds, and the 180's ballistics are much superior at those distances.

It is a little faster than 1:9, something around 1:8.6 I believe. I was thinking about the 180's but I already had a new box of 168's. I plan on shooting at least out to a grand.
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"Be polite, be professional, but have a plan to kill everyone you meet."
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Custom built 7mm SAUM
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