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Help with 300 ultra groups....

 
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  #29  
Old 10-10-2012, 09:50 PM
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Re: Help with 300 ultra groups....

Quote:
Originally Posted by Rustystud View Post
I rebarreled a customers 300 RUM with a 26" #4 Rock Creek Sporter, 1:10, 5R, with a Harrel's Muzzle brake. The rounds are being loaded with 180 Nosler Balistic Tips or 180 Swift Scirocco II. The throat has been opened to 3.315" Thus giving the bullets a .200" jump. I shot 5 shot groups with Reloader 22, H-1000, Retumbo, H-4831SC, IMR 7828. The brass was Remington, Primers were Federal 215 GMM. I full length sized, trimmed, chamfered, anealed, and cleaned primer pockets, between reloadings. My loads with H-4831SC were sub .5moa. and the loads with Retumbo were sub 1. moa. I shot velocities between 3,150 and 3,300fps. Quite a round. I shot over 100 rounds today.

One thing I noticed with the H-4831SC was I shoot 78.5grains with 180 Scirocco in my 300 Win Mag to get 3,1150 fps. With the 300RUM I was shooting 86. grains to get basically the same velocity.

With the 300 RUM it will be nice to be able to shoot 150 grain bullets at 3,400- 3500 fps.
Nat Lambeth
Hell, if I can get the 180's I use to 3300+ fps with rl25 in my rum you can take a 150 to 3600 fps. You are using rather fast powders in your 30 rum for full speed ahead though, especially for 180 grain + bullets. You should nearly be using 50bmg powders. I use rl50 with 225 hornady hpbt's and imr 5010 and wc872 also with both doing very well at modest pressures. It really sucks that my i 5010 went bad as I had a 180 doing 3320 with it at 5 grains below top load tried. I didn't chrono the run-up though so I can't tell you what max was. I need to get some 5010 again but it's very hard to fing good 5010 lately. WC 872 will get you to 3300 fps with a 180 at about full tilt, but I like rl25 better.
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  #30  
Old 10-11-2012, 07:10 AM
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Re: Help with 300 ultra groups....

Looks really good with the 91.5 of Retumbo . I would push it a little more., looks to be accuracy between 91.5 and 92 gr,
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  #31  
Old 10-11-2012, 08:11 AM
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Re: Help with 300 ultra groups....

Dan,

Took 'nother look at those groups. R U measuring talking edge 2 edge or center-to-center measurement?

The 91.5 load looks 3/4 edge to edge.
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  #32  
Old 10-11-2012, 10:16 AM
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Re: Help with 300 ultra groups....

Yes I measured edge to edge......... Is center to center the norm..... oops haha.
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  #33  
Old 10-11-2012, 09:48 PM
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Re: Help with 300 ultra groups....

Just measured the 91.5 group center to center...... .48. I was thinkin when you measured a group size it was edge to edge. The 92 grain group center to center went just shy of .75 so I think we'll be able to find somethin right through there somewhere.. Lookin forward to shootin with ya Roy. Dan
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  #34  
Old 10-11-2012, 11:12 PM
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Re: Help with 300 ultra groups....

Sheeeesh . . . greenies. . .

Quit lookin' and go to shootin'
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  #35  
Old 10-19-2012, 01:04 AM
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Join Date: Oct 2012
Location: Trout, Louisiana
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Re: Help with 300 ultra groups....

Here is a load I load just for target shooting
Hornady A-Max 168 gr.
H-1000 96 gr.
Federal Match primers 215
Factory length and they shoot 1" groups at 300 yards
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