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300 Win Mag Load Development Help Needed

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Old 06-03-2009, 11:43 AM
Bronze Member
Join Date: Dec 2007
Location: Helena, MT
Posts: 79
300 Win Mag Load Development Help Needed

Hey guys,
Need a little help. I am trying to dial in a handload for my 300 Win Mag. I am shooting a Rem 700 Sundero with 26" barrell. I have been flailing with some Barnes TTSX 180 grain rounds. I got info to load them extremely long (OAL of 3.5) I have messed around and cannot make them work. I am getting ready to try some old standbyes, ie the Sierra HPBT 180 gr. I would love to use H1000 since it is my choice for my 338 edge. Keeping one powder for both would be great. I am using CCI 250 Mag Primers (Same as Edge for reasons above). Any help would be great!!
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Old 06-03-2009, 12:17 PM
Silver Member
Join Date: Dec 2006
Posts: 336
Re: 300 Win Mag Load Development Help Needed

I probably won't be much help here, as I've never reloaded any of the Barnes bullets...but, all that I've read about them is that they like quite a bit of jump before they hit the lands. How far off the lands are you seating the bullets? I've read as much as 0.050" before they started getting any accuracy out of them.

Good luck!
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Old 06-03-2009, 01:59 PM
Bronze Member
Join Date: Feb 2009
Location: SC
Posts: 71
Re: 300 Win Mag Load Development Help Needed

I am shooting a Rem 700 XCR long range tactical with a 26" barrel. Don't know how similiar it would be to the sendero, but I would think they would be close.

I am currently shooting 150 grain Sierra BT gamekings ( I have some 180's ordered but they haven't come yet). I got some promising results shooting
80 grains of H1000. My brass is winchester with a winchester WLR primer. My COAL is mesured with a stoney point bullet comparator and is 2.860" which in my rifle is jumping .050". For some reason this is what my rifle likes with these bullets. Last weekend I shot a 3 shot group at 200 yards that measured 0.977", pretty good for a factory rifle.
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Old 06-03-2009, 06:00 PM
Platinum Member
Join Date: Dec 2001
Location: Winterville, NC
Posts: 1,490
Re: 300 Win Mag Load Development Help Needed

I have not tried the TTSX in any of my rifles yet, but have had good luck with the 100gn TSX in .257 cal and 140gn in .284 cal.
That said, in my .300WM, I tried the 180gn NBT with RL22/9.5M & BR2 primers and never could get accuracy under .6". Then I tried them with H4350/9.5M and @ 69.0gn I got .370" and 3094fps (avg). This load shot good for me at 650yds. I let my son, three nephews and brother-in-law shoot it at that distance. Only my son had previous shooting experience that far, but the nephews and B-I-L are hooked! They all could consistently ring the 12X18" gong I made and boy were they'a grinning!
I tried the 190gn SMK with RL25 and WLRM (and 9.5M) primers but the best I got was a .5" (once) and couldn't duplicate it.
Then I tried the 180gn SMK with RL22/9.5M OAL:2.8950" and @ 75.5gn's I'm getting an average velocity of 3133fps and accuracy is running in the .3's.
Still got more testing to do (180NBT/w RL25 & 190SMK/w RL22 and others) but will share this info if you like.
Oh, I did try some 165gn NBT's I had on hand the day after I bought the rifle. I used H4350/9.5M OAL: 2.8925". I tried 71/72/73gns and accuracy and velocity ran; .585" @ 3244fps (71.0gn), .4175" @ 3269fps (72.0gn) and .6340"@3296fps (73.0gn).
Hope all this helps and encourages you to keep trying. The .300WinMag is an awesome cartridge and capable of very good accuracy. JohnnyK.
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Old 06-03-2009, 08:41 PM
Platinum Member
Join Date: Jan 2008
Posts: 4,388
Re: 300 Win Mag Load Development Help Needed

Barns Bullets work best when jumped in to the lands. I would do a search for Barns bullets and see what other guys did to get there rifles to shoot.
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Old 06-03-2009, 09:30 PM
Silver Member
Join Date: Jan 2008
Posts: 177
Re: 300 Win Mag Load Development Help Needed

seat the bullets .50 from rifling. change primer then try a different powder. i had better luck with imr 4350, rl 22 than h1000 in my gun. my gun actually liked the 168s better than 180s.
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Old 06-03-2009, 10:26 PM
Gold Member
Join Date: Jun 2006
Location: Shangri-La
Posts: 926
Re: 300 Win Mag Load Development Help Needed

I load for 9 different guns in 300 win mag and in all cases the TTSX's shoot well seated .050" off the lands but you should be using RL22 and Fed215 primers. H1000 shoots good but not as good as the RL22 or even RL25. But you definitely should move to the Fed215's (if you can find them).
If you can read this, thank a teacher.......if you are reading this in English, thank a soldier.
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