338-300 Win Mag (338 Patriot)

thesheepdog

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It's been a while since I've done anything with this: working 50-60 hours a week and studying to be an engineer at the same time....yeah.....

Anyway,

I got some free time this weekend to play around with some loads. I opted to use some IMR 7828 and Berger 300gr OTM's.

Load specs:

67gr IMR 7828
300gr Berger OTM
Federal 300 WM brass
Rem Mag Primers
3.875 OAL

Rifle Specs:
Bartlein 28" MTU 5R, 1:9.3 (nitrided)
Rem 700 custom action

This load was clocking about 2500fps. I have more powder room in the case to boost the velocity, so that't what I am going to do over the next few weeks.
I also plan to take this bad-boy out to 1300 yards in the next few weeks as well.
 

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Timber338

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Very cool rifle. I'm really interested to see where your load ends up and how it shoots at long range.

And I might be wrong, but I'm guessing you're studying mechanical engineering?
 

thesheepdog

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Very cool rifle. I'm really interested to see where your load ends up and how it shoots at long range.

And I might be wrong, but I'm guessing you're studying mechanical engineering?
Thanks for the reply! I am just as interested as you-if not more. My hope is to get 2550-2600fps out of this load with 300gr and 2700ish with the 250's.

I would like to do Mechanical Engineering, however, I have most of my experience in computers/programming; with that, Computer Engineering my be my forte.
 

thesheepdog

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So, I got to stretch the 338-300's legs out to 1000 yards with some 250gr HPBT's (Hornady).

Average velocity was 2715 fps, using 72.5gr RL26.

This load shot like a laser.

I also used the same powder charge for some 285 AMAX's and 300gr Bergers. The 285s were running 2685fps and the 300gr Bergers were running 2630fps
 

7mmShooter

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Awesome, but what DBM are you running to mag feed that 3.875" OAL? Seekins 3.990"...? Definitely interested, as this is another option for a 338 on a 700 platform!
 

thesheepdog

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Awesome, but what DBM are you running to mag feed that 3.875" OAL? Seekins 3.990"...? Definitely interested, as this is another option for a 338 on a 700 platform!
That's typo. :) It's actually 3.785. I am running the Accurate Mag/AICS + (ext.) length mags out of my Mcree Chassis. I have some 338 Edge barrels for this action that I load to 3.8"ish.
 

7mmShooter

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That's typo. :) It's actually 3.785. I am running the Accurate Mag/AICS + (ext.) length mags out of my Mcree Chassis. I have some 338 Edge barrels for this action that I load to 3.8"ish.
OK, that makes more sense!:) i like it, with the Ultra Mag brass being so hard to find locally to do the Edge, this opens up another option. Getting 2600+ with RL26, with room to spare I assume, is pretty awesome considering the relatively low powder charges (compared to the Edge/Lapua, etc). Keep up the great work sir!
 

thesheepdog

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OK, that makes more sense!:) i like it, with the Ultra Mag brass being so hard to find locally to do the Edge, this opens up another option. Getting 2600+ with RL26, with room to spare I assume, is pretty awesome considering the relatively low powder charges (compared to the Edge/Lapua, etc). Keep up the great work sir!
Yes! That's why I went with a "backup" .338 caliber for my 338 Edge-brass was too hard to find and expensive.
And 2600+ with a 300gr Berger is nothing to cry about. That is one heck of an LR load.

Here's where I got my reamer from, in case you'd like to make yourself one too.

Reamers, Chamber Reamers, Jgstools.com, Rifle, Shotgun, Pistol, Chamber Reamers , Gauges, Bore Reamers, Precision Tools, Rifle Button, Turbo Assesories, Quality Tooling
 

thesheepdog

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So Saturday I got to push the .338 Patriot (.338-300 Win Mag) out to 1200 yards. I was using 300gr Bergers loaded to 3.785 OAL which clocked 2610 fps (very low SD) using 72.5gr RL26. RL26 is like the big-bore magnum version of RL17. I absolutely love both of these powders. No pressure signs at all. Based off my predictions, I am within .338 Win Mag territory still as far as pressure is concerned, with about 10gr more case volume.

Overall, I am very pleased with this caliber. I don't even shoot my .338 Edge anymore, because it's way overkill for 1200 yards.
 

thesheepdog

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It's been a while.

Good news though. My buddy and I found a range here in Texas that offers up to 2400 yards of distance and we're planning on heading out there sometime next month.

This is amazing for so many reasons. 1) I get to stretch the legs of my .338-300 Win Mag beyond a mile 2) shooting a mile+ is a lifelong dream 3) I also get to test out my .308 Win, 208gr AMAX loads.

Stay tuned. I'll be posting pictures/videos about this once I get the opportunity.
 

7mmShooter

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It's been a while.

Good news though. My buddy and I found a range here in Texas that offers up to 2400 yards of distance and we're planning on heading out there sometime next month.

This is amazing for so many reasons. 1) I get to stretch the legs of my .338-300 Win Mag beyond a mile 2) shooting a mile+ is a lifelong dream 3) I also get to test out my .308 Win, 208gr AMAX loads.

Stay tuned. I'll be posting pictures/videos about this once I get the opportunity.
Awesome! gun)
 

thesheepdog

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So I finally did it!!! I got to shoot 1 mile with my 338 and actually hit something!!

I used 285gr AMAX to get my 1st and only hit at a mile away. 22.1 mils of elevation and 1.5 mils for wind on a 24x24 target.

My original dope was off by a mil. I noticed my first shots at 1760 were a mil high, so I went back to 1100 and checked my DOPE, and it was a mil high. So I corrected, started to engage the 1 mile plate and my next shots went 0.2 mils left, so I corrected and BANG!!!! One shot on the bottom left edge of tech plate.
 

7mmShooter

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So I finally did it!!! I got to shoot 1 mile with my 338 and actually hit something!!

I used 285gr AMAX to get my 1st and only hit at a mile away. 22.1 mils of elevation and 1.5 mils for wind on a 24x24 target.

My original dope was off by a mil. I noticed my first shots at 1760 were a mil high, so I went back to 1100 and checked my DOPE, and it was a mil high. So I corrected, started to engage the 1 mile plate and my next shots went 0.2 mils left, so I corrected and BANG!!!! One shot on the bottom left edge of tech plate.
Nice, congratulations on busting the mile!
 

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