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FINALLY Got to Shoot My 338 Ultra Mag.

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Unread 04-14-2010, 01:45 PM
Gold Member
Join Date: Sep 2009
Location: SW MT or noVA
Posts: 986
Re: FINALLY Got to Shoot My 338 Ultra Mag.

Very nice rifle! Looks exactly like my 308 set up actually. Same stock, rear bar, and my barrel contour is just a little heavier. Hope it shoots as good as it looks for ya!
"Out of range" is a theoretical concept as far as I'm concerned. Send it!
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Unread 04-14-2010, 02:24 PM
Gold Member
Join Date: Feb 2008
Location: Sonoma County, CA
Posts: 827
Re: FINALLY Got to Shoot My 338 Ultra Mag.

Tarey, that thing is bad *****. I've followed your posts and all the work looks like it was well worth it. Very nice looking rifle. I'll look forward to reading your future posts on your progress and look forward to seeing some pics when you get the other stock on it. Good job.
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Unread 04-14-2010, 10:53 PM
Posts: n/a
Re: FINALLY Got to Shoot My 338 Ultra Mag.

Thanks guys for all the nice replys.
Freebird63 Dual dovetail rings are single rings that twist in and not actually double rings. I used Signature Z rings and you could put as many as you have room for on the rail.
I thought if 2 were good 4 would be better. I did some mule deer hunting here in AZ this past fall and after hiking in to different places, I found that I had to climb up some treacherous rocky areas, or backtrack a mile or so to get around them. So I figured if I were to ever fall with the rifle strapped on or carrying it, just MAYBE the scope would still be sighted in. I think the rings would be the weak link, if I didn't break the scope.
Long Time Long Ranger, I loaded 20 rds. with 94grs. of RL 25 to go test on thursday.
I cleaned it every shot for the first 10 shots and then shot it five times before cleaning it again. Now I have run 20 patches during the course of the day with bore tech eliminator and the patches still come out blueish green.
How long does it take to come clean or am I over doing it?
Bigbuck, how is your Broughton barrel to clean and what do you use?
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Unread 04-14-2010, 11:06 PM
Gold Member
Join Date: Dec 2009
Location: Boise, Idaho
Posts: 533
Re: FINALLY Got to Shoot My 338 Ultra Mag.

All I know is its a sweet looking weapon and now I want one. I think I need to get my sendero 300RUM set up first before I consider a new project. good luck and keep us posted.
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Unread 04-16-2010, 12:00 AM
Posts: n/a
Re: FINALLY Got to Shoot My 338 Ultra Mag.

The first pic is the 15 shots I used to sight in at 100 yds. and find a load 2grs. less than max. I cleaned it between every shot for the first 10 and then after the next 5 rounds. LTLR said between 93 and 94 grains of RL 25 was accurate for him.
So I loaded up 20 rounds with 94grs of RL 25 and Nosler 250gr. Accubonds
3.800 OAL.

The next 2 pics were the 250 NAB's that I shot at 200 yds they were all over the place. It was about 90 degrees out with some breeze and some mirage. I cleaned after every five shot string. They chroned at 3125 to 3160fps at 12 ft. from the muzzle.

Any idea why they are all over the place, I let the barrel cool in between shots, at least 15 minutes.
I thought maybe something was coming loose or the scope was taking a $$hit. So I cleaned the barrel and tried some 180 gr. Ballistic tips I loaded a while back that shot 3/4 inch at 100 yds. out of the factory barrel. I shot them over the chrono and they ran between 3558 to 3581 fps. laoded with 91gr. AA4350. So I know nothing is loose.

So I know it will shoot. Should I try seating the bullets a litle farther from the lands, I am about .010 now.
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Unread 04-16-2010, 03:51 AM
Platinum Member
Join Date: Feb 2009
Posts: 3,546
Re: FINALLY Got to Shoot My 338 Ultra Mag.

Congratulations, nice looking rig and looks like a shooter as well. I too thought about going with 4 rings.
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Unread 04-16-2010, 09:13 AM
Platinum Member
Join Date: Mar 2002
Location: Wyoming
Posts: 2,612
Re: FINALLY Got to Shoot My 338 Ultra Mag.

Every rifle is different. It doesn't look like your rifle likes the 250's very much. I have a 338-378 that will not shoot the 250's but will shoot the 225's and 200's into 3" groups at 600 yards. The 250's shoot 4" groups at 100 yards. Back when the 338 ultramag first came out and I was testing it against the 338-300 ultramags the 93-94 grains worked well with the 250 grain sierra and it works well in mine now with the 250 accubond. Mine are seated to max length in the magazine which would be well off the lands and I can get them into 4" at 700 yards in a factory rem 700. I would shoot what shoots best and not try and force one bullet through it that it doesn't like. I also got some good loads with 7828 using the 250's. I would adjust the seating depth first and then adjust the charge and see if that helps. Your rifle just may not like the 250's. With that group all over the place another bullet may be the only answer.
Predictions are difficult, especially when they involve the future
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