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338 RUM load success with 285gr BTHP

 
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  #1  
Old 06-26-2013, 06:41 PM
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Join Date: Apr 2010
Posts: 108
338 RUM load success with 285gr BTHP

So after 2 years of building a rifle and developing a load I have finally achieved success. Since 300 smks have been next to impossible to find in the past 6 months I had to develope a load using Hornady 285 gr BTHP. After much research I had turned up next to nothing on loads for the 388 RUM using this particular projectile. I did what most reloaders would do and found a smiliar weighted bullets load data and started with the absolute minimum powder charge and worked up. I used H1000 because it was readily available at my local cabelas. I started somewhere around 87 grains and ended up going up to 97 grains in half grain increments. 97 was way too hot and 96.5 was having some extraction issues. Here is the final load I have settled on:

Remington 700 with a 26" GAP barrel 1/10 twist 5R rifling.
338 RUM
96 grains H1000
Remington Brass
CCI magnum primers
285 grain Hornady BTHP
COAL 3.72

Velocity 2960
SD 7
ES 14

Keep in mind that I was able to load this round much longer than all the books tell you. Therefore increasing powder capacity and decreasing pressure. DO NOT attempt this load at the saami COAL spec of 3.6 for obvious reasons.

I'd like to thank my buddy Mike for helping me with this very long process.

Now I just need a muzzle brake!
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  #2  
Old 06-26-2013, 10:31 PM
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Join Date: Jan 2008
Location: NW Montana
Posts: 795
Re: 338 RUM load success with 285gr BTHP

That is a stiff load for the 338 rum. MY 2 338 edges would not go to 96 grs. 95 was right at max with the 300 gr SMK and never got over 2900 fps for velocity with a 28 and 30 inc barrel. bullet seated at 3.9 Those are some impressive numbers for the 338 RUM with a 285 gr bullet and only a 26 inch barrel .Are you getting a ejector button stamp and flat primers?
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  #3  
Old 06-26-2013, 11:05 PM
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Join Date: Apr 2010
Posts: 108
Re: 338 RUM load success with 285gr BTHP

Quote:
Originally Posted by highridge1 View Post
That is a stiff load for the 338 rum. MY 2 338 edges would not go to 96 grs. 95 was right at max with the 300 gr SMK and never got over 2900 fps for velocity with a 28 and 30 inc barrel. bullet seated at 3.9 Those are some impressive numbers for the 338 RUM with a 285 gr bullet and only a 26 inch barrel .Are you getting a ejector button stamp and flat primers?
It's stiff alright. So Is my shoulder. At 97 grains I needed a mallot to pull the bolt back. WAY to hot. As for 96 grains I've got ZERO pressure signs. Being alittle skeptical myself and thinking the chrono was reading gas blow by speeds, I pushed the chrono out to 15 yards. And it was still giving me great readings. My buddies 308 was dead nuts on. And we both confirmed our drops using a ballistics calc and shooting out to 400 yards. Idk if I've got a fluke of a barrel from GAP but the velocity is good to go. Still looking for a brake to save my shoulder tho.
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  #4  
Old 06-30-2013, 08:50 PM
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Join Date: Jun 2004
Location: Worland, Wyoming
Posts: 527
Re: 338 RUM load success with 285gr BTHP

This does seem to be a pretty hot load. I load 97 grs of H-1000 with a 225gr accubond for 3300 fps and 90 gr of H-1000 with the 300 gr Berger for a drop chart verified 2830. I have an older lot of H-1000 that is nowhere near as hot as the newer lots and I don't use it. Be careful when you change powder lots so you don't get a bad surprise. How are your primer pockets when reloading your brass? If your pressure is over the top, your primer pockets will open up in a hurry.
__________________
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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  #5  
Old 07-07-2013, 08:55 AM
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Join Date: Dec 2011
Location: Michigan
Posts: 1,040
Re: 338 RUM load success with 285gr BTHP

Quote:
Originally Posted by aramarine6 View Post
I started somewhere around 87 grains and ended up going up to 97 grains in half grain increments


Now I just need a muzzle brake!
I hope that rifle weighs about 60lbs! Bet you took a beating doing that much load development without a brake!

As others have stated, be cautious with that load. There is no free lunch - at a given barrel length velocity has to be derived from pressure, whether it is obvious in looking at your brass or not.
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