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338 Ultra Mag

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Unread 12-31-2003, 12:46 AM
Bronze Member
Join Date: Jul 2003
Location: Bountiful, Utah
Posts: 71
Re: 338 Ultra Mag

Recoil first - it's exactly double that of a 7mm Rem Mag. You can either create a heavy gun that tames the recoil, or put a brake on it, or do both!

As for the barrel length, Remington puts a 26" barrel on their RUMs, and I suspect that something more like a 27" or 28" barrel is in order (minimum length). I've heard of some people putting even longer barrels on them with good results. The heavier the bullet you plan on shooting the more improvement you'll get with a longer barrel.

Sounds like you're building a hunting rifle. Anything longer than 26" will do pretty good.

Mark in Utah
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Unread 11-23-2016, 02:17 PM
Gold Member
Join Date: Feb 2010
Location: North Pole
Posts: 619
Re: 338 Ultra Mag

I have both the Lapua and Ultra Mag in 338

My ultra mag is one of the Rem 700 XCR2
The 26" is great but the Rem stock had to go........replaced with a HS Precision.
I also sent it off to Mag Na Port for a port job instead of a brake......that is hard on the ears. Sure took the muzzle blast out of it.
The trigger replaced it with Timmney Trigger and put a M16 extractor on it.

Installed a HS Precision Detachable Floorplated on it.

She wears a Older Redfield ILLUMINATOR Accurange 3x9 scope in Redfield Rings and Bases.

I reload for the my 338 RUM using 230gr Fail Safes and 93.0 of IMR 7828 in R-P cases with CCI 250 primers and 250 Sierra GK with 92.0.

Sure is a good shooter..........a lot of thump most excellent for moose past 500 yards.
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Unread 11-23-2016, 06:22 PM
Silver Member
Join Date: Feb 2015
Posts: 158
Re: 338 Ultra Mag

I load 250 gr accubonds or Berger in my 338RUM built on rem 700 action. With 26 inch barrel I get about 2970 with R25. I think the 250gr is the best fit for the 338 Rum in terms on speed and down range punch. The 300 gr will take over around 1000 yds. As stated early to get best out of the 300gr you need a 28-30 inch barrel. With a muzzle break its not bad to shoot, i wouldn't want to shoot one without a break
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Unread 11-24-2016, 02:47 PM
Silver Member
Join Date: Jun 2010
Location: North Idaho
Posts: 201
Re: 338 Ultra Mag

If you or any one is interested I have a 700 XCRII that I am going to convet to 28 Nosler. I am selling the 26 inch factory barrel with a brake (140) rounds through it, 300 count of 230 grain berger elite hunter bullets, RCBS Dies, and 96 count of Remington cases (70 of them twice fired, the other 26 once fired).
send me a PM if interested.
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