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FINALLY Got to Shoot My 338 Ultra Mag.

 
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  #1  
Old 04-14-2010, 01:11 AM
GNERGY
 
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FINALLY Got to Shoot My 338 Ultra Mag.

I finally got to shoot my new long range rifle.
I had the Broughton barrel chambered and installed by Jim See @ Centershot Rifles. He also squared up the Rem. 700 action and lapped the lugs. He worked on the trigger and installed one of his 3 port Muscle brakes.
NOW it kicks less than my Rem. .308 7400 semi auto.
When I got the barreled action back from Jim, I opened up the scope mounting holes to 8-36 and modified the EGW 20 MOA base to take the larger machine screws. Then I opened up the bottom of the action to accept a longer magazine box. I also swapped out the factory recoil pad for a Decelerator pad.
Then I bedded the Joel Russo and the factory HS Precision stocks.
Here is that thread.
Work of Art is on it's way.
I just got done sanding my JR stock with 400 grit and when it isn't so windy I will sprat it with auto clear ( will post pics when done )
I then mounted a Burris Black Diamond 6X-24X-50 in some double signature rings.

I plan on using the 250gr. NAB's so I started with 86grs of RL-25 and worked my way up in 1/2 grain increments, cleaning after every shot. That took a while and since I didn't get to the range till 1:00
I am using Fed mag primers and my COAL was 3.800
The first shot chrono'd at 2826 fps. ans the last round I got to shoot was 94.5 grains and it went 3153 fps. it was 6:00 and the range closed and they kicked me out, I told them I wasn't done yet But I had to leave anyway. The bolt handle was still easy to open.
What are you guys loading behind 250 gr bullets?
Here are a couple pics from the range.




So I still have some more loads to shoot to find the one where the bolt handle gets a little hard to open and drop back 2 grains ( as per the Kirby Allen method of load development )
I'll keep you posted, going back to the range on thursday
Thanks for looking and a big 2 thumbs up for Jims Muscle brake, makes it enjoyable to shoot.
Tarey
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  #2  
Old 04-14-2010, 01:35 AM
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Join Date: Mar 2002
Location: Wyoming
Posts: 2,615
Re: FINALLY Got to Shoot My 338 Ultra Mag.

You are right in there where my rem 700 338 ultramag shoots. About 94 grains and 3150 fps is where I get my best accuracy/velocity ratio. With that you can flatten elk size critters at a half mile easily.
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Old 04-14-2010, 01:42 AM
GNERGY
 
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Re: FINALLY Got to Shoot My 338 Ultra Mag.

LTLR, thanks for the advice. So did you find that going any heavier started to show signs of high pressure? Flattened primers or hard to lift bolt.
Tarey
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Old 04-14-2010, 09:24 AM
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Join Date: Feb 2008
Location: Three Rivers, MI
Posts: 721
Re: FINALLY Got to Shoot My 338 Ultra Mag.

Very nice, I cant wait to get my RUM done.
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Old 04-14-2010, 09:38 AM
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Join Date: Dec 2009
Location: Boise, Idaho
Posts: 473
Re: FINALLY Got to Shoot My 338 Ultra Mag.

Very nice. Not to sound too stupid here, but why the double scope rings?? is it because of the recoil or the size of the scope?? I know my gunsmith reccomended daul dovetail mounts on my 300RUM.
Can't wait to here more details.
Chuck
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Old 04-14-2010, 09:45 AM
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Join Date: Jun 2009
Posts: 1,654
Re: FINALLY Got to Shoot My 338 Ultra Mag.

Nice Rifle GNERGY. Youre going to love that Broughton ! If it breaks in like my 300 RUM did you will see some tight groups at around 80 Rounds Tim said around 100 but mine showed up at 80 . Then I moved out to 200 and had little Clover leaf groups .

BigBuck
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Old 04-14-2010, 12:36 PM
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Join Date: Mar 2002
Location: Wyoming
Posts: 2,615
Re: FINALLY Got to Shoot My 338 Ultra Mag.

I went back over my notes and 95.5 with re25 is the highest I went. Pressure signs started there with my rifle. 93-94 grains at 3100-3120 fps was where I hit my best loads. Mine is a standard 26" stainless remington barrel with brake.
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