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H1000 or Retumbo ?? 280 ackley

 
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  #8  
Old 10-13-2011, 06:36 PM
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Re: H1000 or Retumbo ?? 280 ackley

I think both r too slow for that bullet cartridge combo. H4831 should ne the ticket. Don't worry so much about flat primers. That is subjective. Worry about heavy bolt lift, cratering of primer and ejector marks. I will run it on quickload tomorrow and see what it says for pressure. I bet its not as much as u think.

Last edited by bailey1474; 10-13-2011 at 06:40 PM.
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  #9  
Old 10-14-2011, 01:17 AM
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Re: H1000 or Retumbo ?? 280 ackley

Tried both h1000 and retumbo. Reluctantly I tried rl-17 and its been great. I use 54.8 gr rl-17 in nosler cases and 168 gr bergers for 2870 fps out of my 1-9 twist benchmark 25" barrel. I'm kinda dissapointed in my 280 ai. After 300 test loads im over pushing it that hard. H1000 gave great accuracy but only 2700ish fps. Retumbo was better but I couldn't get it to be consistent since the load was so compressed. If I wasn't targeting bigger stuff I woukd try the 140 gr vld.
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  #10  
Old 10-14-2011, 09:47 AM
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Re: H1000 or Retumbo ?? 280 ackley

When I first built this gun, the barrel was really ruff. Copper fouled really bad. I could not get it to shoot very good. I tried IMR 4831, h4831sc, R22 and R-17 with 139sst and 154sst. I really wanted it to shoot the 139s. They shot the worst. I lapped the barrel and tried a couple of loads with H4831sc. It shot alot better right at 1"with the 154s, then I tried 168VLD and 162 Amax that is when she started to shoot under 1/2". The R-22 shoots good too. I should leave well enough alone but I would like to get a little more velocity if I can. I am going to shoot the Ramshot Mangum today. We will see what happens. If I can't get anymore speed I will just live with it. Accuracy comes first. Speed is just iceing on the cake.
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  #11  
Old 10-14-2011, 10:13 AM
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Re: H1000 or Retumbo ?? 280 ackley

56 gr shows you at 46,000 psi on quickload. Dump some more powder in that case. I wouldn't want to go much over 60 gr according to quickload though. Be careful and work up. This is just some #s based on a computer program. Just watch for the primer to crater around the firing pin, heavy bolt lift and watch for ejector marks on the head stamp of your brass. If you get too much of any of these or all of them you know you are too hot!!
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  #12  
Old 10-14-2011, 10:58 AM
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Re: H1000 or Retumbo ?? 280 ackley

after a lot of shooting with the 168vlds in my 280 AI with a 24" hart barrel i finally gave up on them.

i shoot bergers in my other 2 long range guns with awesome results, but couldn't make it come together with the 280. i switched to 162 amax and instantly starting having a lot better results.

i shoot 59.5 gr of 4831sc with the 162's 50 thousandths off the lands with great results. i also switched to fed215M's from the 210's.

if i had it to do over again i might have gone 7wsm, but i'm warming up to the 280 in the last month since I started shooting the amax's.

good luck.
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  #13  
Old 10-14-2011, 09:02 PM
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Re: H1000 or Retumbo ?? 280 ackley

Quote:
Originally Posted by bailey1474 View Post
56 gr shows you at 46,000 psi on quickload. Dump some more powder in that case. I wouldn't want to go much over 60 gr according to quickload though. Be careful and work up. This is just some #s based on a computer program. Just watch for the primer to crater around the firing pin, heavy bolt lift and watch for ejector marks on the head stamp of your brass. If you get too much of any of these or all of them you know you are too hot!!
The Ramshot Magnum got me velocity. I went all the way to 3000fps with 64.5g before it started to crater the primer and they never did flaten, but the groups started opening up. 63 and 63.5g shot fair, 5 shot group at 100yds, just a little over an inch 1".110 at 2839 and 2894fps average. I took my last 4 shots at 300 yds and the group went 6". Here is a 10 shot group a 300yds. I shot prone, off my back pack the other day with the R-22 load. I think I will go back to the H4831sc, R-22 and up the charge and watch the primers again.
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  #14  
Old 10-14-2011, 09:48 PM
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Re: H1000 or Retumbo ?? 280 ackley

Are I necking up 270 win brass? If u are and the bullet is seated below the neck body junction that donut may be causing u problems.
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