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7mm Ultra Powder Choice

 
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  #1  
Old 05-28-2008, 07:45 AM
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7mm Ultra Powder Choice

My 7 ultra barrel should be here in the next couple of weeks and I'm needing to go ahead and order some powder. I was wondering what powder everyone was having success with and what velocity you where getting. My barrel is 30" and I plan on shooting the 162-180 class bullets.
Thanks
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Old 05-28-2008, 08:49 AM
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I would try retumbo.
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Old 05-28-2008, 09:10 AM
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Retumbo or H1000

I have had good luck with Retumbo, but in a 26 inche barrel I think it might me a tad slow. With and extra 4 inches I would think it would work great. I am running 93gr behind a 160 accubond.

Willys
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Old 05-28-2008, 09:39 AM
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i have only used retumbo in mine 26 inch tube.... 88 and 92 worked good with a 168 hpbt
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Old 05-29-2008, 01:09 PM
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I would have to say if your going to the trouble of putting a 30" barrel on the rifle, that you are probably looking for close to maximum velocities with those heavy bullets. In that case i would recomend that you look to the slower ball powders like AA8700, US 869, or some surplus WC 872 (20mm powder, or 860 (50 bmg powder).

Now I was using AA8700 and 872 in my 270-300 Rum (another .007" and it is a 7mm rum), and found that they gave velocities greater than that of powders like H1000 or Re 25 with less pressure. Of course my rifle also had a 30" barrel, but the velocities i was getting were
135 MK 3750fps (working load, 5-6 fireings per case)
140 SST 3715fps (Absolute max 3-4 fireings per case)
150 SST 3650fps (Best load, about 10 fireings before case necks split)
Now you can extrapolate that using a 168gr bullet, the velocity would probably fall in the 3450-3550 fps neiborhood and the 180 close to 3300-3400 fps.

Yah, I know the loading manuals won't show velocities that high, but just remember the barrels they use in their test are usualy only 24-26" long, and that extra 4-6" of barrel can make a world of difference when talking about a fairly small bore like a .277/.284, especialy when your using heavy for caliber bullets.
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Old 05-29-2008, 03:48 PM
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94gr of retumbo 26in barrel got me 3350fps
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  #7  
Old 05-30-2008, 07:17 AM
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Peters,

What grain bullet were you getting 3350 with. Also barrel length/pressure signs?
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