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338 Rum load development

 
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  #1  
Old 06-01-2011, 08:09 PM
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Join Date: Jun 2004
Location: Worland, Wyoming
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338 Rum load development

OK, playing with my rum again trying to find the perfect load. A little history, new broughton barrel two years ago 27 3/8, 1-9.3, #4 contour ,blueprinted action, sako extractor, , Muzzle Brake, Bell and carlson full aluminum bedded stock, canjar trigger, Sightron S III 8-32x56 worked up a quick load that worked and hunted with it. Load was 97 grains of RL 25 with a velocity of 3300 using federal cases with federal primers and 225 accubonds. Well, this was a great load until I started to reload some of the cases. Every other one had a loose primer pocket after only one firing. Well, with the cost of brass and the availability problem of brass, I decided to work up a different load.

Went to the range a couple of weeks ago and loaded up some rounds with 100 grains of H 1000 and very suprised that I was getting over 3300 and some pressure signs. In the past with H-1000, I would be lucky to get 3100, so powder has gotten hotter.

So, I loaded up some rounds with 99 grains of H 1000 and shot them over the new chono today. 225 barnes tipped tripple shocks shot about 3/4 inch @ 3300 and 225 accubonds shot about 5/8 @ 3250, not bad, but had a few more to try. 94 gr of RL 25 with 225 accubonds shot about 3/4 @ 3130, 95 gr of RL 25 had 3 shots in 3/8 with a flyer on 4th shot of about an inch @ 3200 and very low deviation.

I also decided to try a load that another member was having good luck with, so I loaded a few with 86 grains of IMR 4350 with 225 accubonds and had 3 cutting same hole and 4th 3/8 off and hoovering around 3200. Very promising, but some ejector marks on the cases. Then I tried the same powder charge with some tipped tripple shocks and some definate pressure on the first shot and blew out a primer on the second shot around 3250, but definately high on the pressure.

To keep all of this in context, I shot 3 federal factory rounds loaded with 225 accubonds, very low standard deviation, but lousy accuracy around 3 inches. I got home and pulled a bullet on the factory round and found 91 grains of some kind of powder, maybe h4831 sc, but not sure, doesn't match anything I have.

I am temped to pull a few more of these factory rounds, neck size and reseat the bullets to magazine length the same as the rest of my reloads.

Just throwing this info out there, the gun shoots well, probably a lot better than I do. I am leaning to the H 1000 load to get away from the temp sensitivity of the rl 25, since most of my hunting is when it is cold out.

I have also done some testing with 225 hornady interbonds and the three of these bullets seem to be flying about the same @ 700 yards. It was a little too windy today to try and shoot any distance for load development, maybe tomorrow.

Any comments?
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Remington model 700 300 RUM LH 26" rem ss/blued receiver lam stock 215 Berger @3025/180 NAB @3300
Remington model 700 338 RUM LH 27" Broughton 5C 225NAB@3300 /300gr Berger@2830
Savage LH 22-250

Last edited by D.Camilleri; 06-01-2011 at 08:17 PM.
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  #2  
Old 06-03-2011, 06:55 PM
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Join Date: Apr 2010
Location: Allen, TX
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Re: 338 Rum load development

I'm surprised nobody ever replied... I am completely unfamiliar with 338 anything. But, I'm thinking about building one. So, I was hoping to learn something.

I see no point in altering factory loads. They're great to establish a baseline. But if you handload, you might as well build your ammo from the ground up.

It also sounds like you've got a lot of variations going. Either you're shooting a lot or perhaps not spending enough time with one set of components?

Are you using the Fed gm215m primers?

How many rounds have you fired over 2 yrs? And, how's the barrel life?

Might the throat be erroding forward? Do you need to check your COAL again and adjust your seating depth?

In any case, 3/4" @ 100yds with a cannon like that will handle most people's hunting requirements. If it was me, I'd take one of the better loads and start fine tuning seating depth while paying close attention to brass prep. ..also, measure, weigh, and sort everything.

Let us know how it turns out.
-- richard
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  #3  
Old 06-03-2011, 09:59 PM
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Re: 338 Rum load development

I started my testing with RL-25 and found out that every week it got hotter out so did my loads. I found out that testing at 300 yds instead of 100 was recommended by LRH members and it did work out better for me. Gives the bullet a chance to go to sleep and you might just get better results.
Tarey
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Old 06-03-2011, 10:21 PM
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Location: Blackfoot, Idaho
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Re: 338 Rum load development

I don't understand why one would load hot a 225 grain bullet when a case full of 50 BMG and a 300 grain offering will out do it all the way around at LRH ranges? And cases last for more than several shots.

Just my way of thinkin'. . .
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  #5  
Old 06-03-2011, 10:45 PM
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Re: 338 Rum load development

I would give the Hornady 225 grain Interbond bullet a try. They are very good on game. I use a load of 99gn H1000.
Here is a photo of one pulled from a deer and an unfired one for comparison.

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Old 06-03-2011, 11:47 PM
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Join Date: Jan 2005
Location: Western MI
Posts: 716
Re: 338 Rum load development

I have a M700 LSS 338 RUM factory stock except fpr the Pachmyer Decelerator recoil pad and a Mark 4 4.5-14 scope. Shooting the Nosler 250 gr AB with Retumbo.


JD338
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  #7  
Old 06-04-2011, 10:07 AM
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Re: 338 Rum load development

Quote:
Originally Posted by royinidaho View Post
I don't understand why one would load hot a 225 grain bullet when a case full of 50 BMG and a 300 grain offering will out do it all the way around at LRH ranges? And cases last for more than several shots.

Just my way of thinkin'. . .
What twist does he have/need in order to stabilize the 300gr bullets?
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