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338 Ultra Mag Info

 
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  #22  
Old 01-30-2014, 12:21 AM
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Join Date: Mar 2012
Location: NW Louisana
Posts: 317
Re: 338 Ultra Mag Info

The rifle that I'm having built is not going to have a muzzel break on it. I e already lost a lot of my hearing over the years an wanna keep what I got! Over the years I've owned rifles with an without breaks, just my choice not to have one on this rifle. That being said, with the ( supposed shortage of H-1000 an Retumbo ) I've got access to imr4350,4831 an 7828 I can also get bmg50. Anybody got any ideas out there for these powders or any others?? All help will be deeply appreciated! Thanks!

DT
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  #23  
Old 06-11-2014, 11:53 PM
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Join Date: Jun 2014
Posts: 47
Re: 338 Ultra Mag Info

My 338 RUM loves little pills, I do occasionally feed it bigger medicine, especially past 300yds. But I get my best grouping with 200gr Ballistic tip over 93gr RL22.

I just loaded the BTs over RL33, and as I suspected 106gr is the max the case can hold, and would be a compressed load. I stopped mine at 105gr, but I don't think I will be able to fire them till Friday. I will try to post pics and results once I do.
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  #24  
Old 06-12-2014, 07:33 AM
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Join Date: Mar 2011
Location: North Dakota
Posts: 494
Re: 338 Ultra Mag Info

Dick,

I use 7828 ssc with the 265 lrx bullet with excellent accuracy. Powder is very stable at any temp and seems to be a very good, consistant performer. In my opinion 4831 and 4350 will burn too fast in the 338 rum. My longest kill to date was with this gun, bullet, powder combo. The very good news is the bullets and powder are available.

Jayson
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  #25  
Old 06-12-2014, 01:14 PM
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Join Date: Mar 2012
Location: NW Louisana
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Re: 338 Ultra Mag Info

Quote:
Originally Posted by Doublezranch View Post
Dick,

I use 7828 ssc with the 265 lrx bullet with excellent accuracy. Powder is very stable at any temp and seems to be a very good, consistant performer. In my opinion 4831 and 4350 will burn too fast in the 338 rum. My longest kill to date was with this gun, bullet, powder combo. The very good news is the bullets and powder are available.

Jayson
Thanks for the info. Since my last post, I've run across some H-1000 & Retumbo. I've got enough in stock now. But I'm still looking at 7828 an RL-33. I've got bout 2pounds of 7828 an one pound of RL-33, that I'm still gonna try. I also load for a 300 win mag an 7mm mag also, so mabey with what I've got I can do all three. I have found out that my 338 ultra love the 250 gr Accbonds. I've got some 200 an 225's also I would like to try but it shoots the 250's great! Still all info will be deeply appreciated!

DT
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  #26  
Old 06-12-2014, 02:47 PM
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Join Date: Jan 2011
Location: Spokane, WA
Posts: 2,612
Re: 338 Ultra Mag Info

Quote:
Originally Posted by Dick Tinsley View Post

I have found out that my 338 ultra love the 250 gr Accbonds. I've got some 200 an 225's also I would like to try but it shoots the 250's great! Still all info will be deeply appreciated!

DT
We went from the 225's to the 250's when they came out. Pretty easy transition. If one shoots the others will is our experience. With the !80's, 225's, and 250's anyway, have never tried the 200's.
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  #27  
Old 06-12-2014, 02:56 PM
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Join Date: Mar 2012
Location: NW Louisana
Posts: 317
Re: 338 Ultra Mag Info

Quote:
Originally Posted by HARPERC View Post
We went from the 225's to the 250's when they came out. Pretty easy transition. If one shoots the others will is our experience. With the !80's, 225's, and 250's anyway, have never tried the 200's.
That's good to know!! I've been wanting to try them, just didn't have a recipe! This 338 ultra is new to me. I've never loaded for one an have only shot one a few times! I can say this, I'm glad I got one! Love it!!!! Gonna be in the loading room this weekend to see what I can come up with then go shoot. Like I said, all info is appreciated!

DT
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  #28  
Old 06-13-2014, 03:32 PM
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Join Date: Jun 2014
Posts: 47
Re: 338 Ultra Mag Info

I went out and shot RL33 work-up loads, and had a really bad range day. I got out there an hour before closing and needed to shoot through quickly, so the grouping is not as tight as I would like. I'm gonna retry 104 and 105grs in three round lots this time and see. I think the point of impact for the first 105 gr load should be where I put the orange mark, but I felt like I moved. I'm not sure I wanna load a lot of these behind light bullets, because I get as good or better perfomance with RL22 or RL25. Also, I might have imagined it, but it felt like there was more recoil with this powder. I didn't see any unburnt powder, but all of the cases where smoking on exit which indicates an incomplete burn to me.
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338 Ultra Mag Info-20140613_115052.jpg   338 Ultra Mag Info-20140613_115916.jpg  

338 Ultra Mag Info-20140613_121050.jpg   338 Ultra Mag Info-20140613_122030.jpg  

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