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338 Rum load development

 
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  #8  
Old 06-04-2011, 05:30 PM
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Re: 338 Rum load development

The twist he has will stabilize any 338 bullet 1 in 9.3 I have the same barrel and the 225s will shoot flatter and still get there with some punch.
Here is some of my testing.
FINALLY Got to Shoot My 338 Ultra Mag.

FINALLY Got To Shoot My 338 Ultra mag Part 2

338 ULTRA MAG & 225gr. BARNES RESULTS

Tarey
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  #9  
Old 06-04-2011, 08:00 PM
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Re: 338 Rum load development

Quote:
Originally Posted by rscott5028 View Post
What twist does he have/need in order to stabilize the 300gr bullets?
10 twist does just fine
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  #10  
Old 06-04-2011, 11:24 PM
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Join Date: Jun 2004
Location: Worland, Wyoming
Posts: 569
Re: 338 Rum load development

I got a chance to load some more and headed to the range today and shot only at 300. Nothing shot very well, with the exception of pulling some bullets from the factory federals, neck sizing and seating the bullets out to my max magazine length. These shot about 3 inches. I put both of my chonographs in line for the shots and found that there is about a 60 fps difference between my pro chrono and my new chrony, with the chrony reading faster.

This barrel only has about 200 rounds down the pipe, and is a great barrel, but the new variable is the new stock. It is full length pillar bedded and I free floated the barrel, I checked it again today and I can slip a piece of paper down the length of the barrel channel. I didn't check the toque on the action screws yet, but I will.

I didn't try any loads with 4350 today, just the h-1000 and rl 25. Velocitities were averaging between 3200 and 3250. I did clean my barrel before shooting today and it is soaking again now for the next set of tests. I am not really sure why the groups opened up so much going from 100 to 300 yards.

I am not seating out as far as Tarey, because I want loads that will fit in my magazine.

When I installed my new stock, all I did was relieve the barrel channel to remove any pressure, and torque the action screws. Is there anything else I should address as far as the bedding?

After pulling bullets from the factory federal loads, I weighed the powder charge and they have 91 grains of powder, I wonder if the powder is h-4831sc, but I don't have any to compare too.

My loads are all using cci 250 primers, some were with federal nickle brass and others were with remington brass, each set of loads was specific however. Kind of scratching my head right now, thinking I will make sure the barrel is very clean and then try some more loads with faster powder like Tarey did.
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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
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  #11  
Old 06-17-2011, 11:40 PM
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Join Date: Jun 2004
Location: Worland, Wyoming
Posts: 569
Re: 338 Rum load development

Loaded some more rounds and shot today and I think I finally have a winner! 98 grains of H-1000 is giving me about 3220 ave, 1.25 group @ 300 and about 3 inches @ 500. I also had good luck today with factory federal ammo with 225 accubonds shooting almost the same as my handloads. Now for some drop charts.
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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
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  #12  
Old 06-18-2011, 06:55 PM
GNERGY
 
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Re: 338 Rum load development

That's good, I'm glad it's finally starting to be the laser it is designed to be.
Tarey
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  #13  
Old 06-20-2011, 01:47 AM
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Join Date: Jun 2004
Location: Worland, Wyoming
Posts: 569
Re: 338 Rum load development

Tarey,

My barrel seems to be producing the same velocity as yours, but mine didn't like the h*4831sc very well. I tried 91 and 92 grains and both were about a 4 inch group at 300 with 225 accubonds. 97 grains of h 1000 seems to be working well with the tipped tripple shocks. They seem to build a little more pressure than the accubonds and seem to settle in with a little less powder. I was hitting about 2 inches high at 300 and only dropping 15 inches at 500. 13 clicks had me hitting a bit low and 16 clicks had me hitting high and off the plywood. I had my target set in the top 20 inches of the plywood because the grass is so high due to all the rain we have had. I was really surprised how well the factory Federal loads shot with the 225 accubonds. I just placed an order for another 200 rounds (to good of a deal to pass up on, loaded ammo for the same price as brass)
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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
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