300 win mag load ?

[krinkansas]

I have 3 300 Win mags. I shoot 200 grain Barnes LRX in 2 of them and they shoot well, but I have several boxes of 175 grain lrx bullets sitting around. Was thinking of using those for the 3rd 300 win mag. I use h1000 for the 2 that shoot the 200 grain bullets. Somewhere in the back of my head I seem to remember reading that h4831 is better for lighter bullets.

What powder would you start load development with on the 175 gr Barnes LRX? I am only interested in powders that are known to be stable from a temperature point of view.

 

[johnnyk]

I would try H1000 first. I used it a few years back w/190gn SMK's and it shot in .2-.3's!

 

[Elkeater]

H1000 is a go to powder in the .300wm.

 

[Overkill338]

I've read about people having great results with RL26. Max load Alliant shows is 79.2gr with a 180 TSX for 3,099 fps.

 

[Wedgy]

If you are looking for a heat stable powder go with H1000 or H4350

 

[IdahoHunter208]

69gr of RL26 with Berger 210 VLD Hunting. Right around 2900fps and 0.5 moa grouping out of a Browning X Bolt long range hunter. 26 inch barrel

 

[MagnumManiac]

Funny thing, I found RE25 to be less heat sensitive that RE22, and it doesn't swing much in lot to lot variation.
I find H1000 lots to swing quite a bit, as does H4350 and Retumbo.

H1000 is a fine powder, but it is a tad slow.

Cheers.

 

[cj518]

74.5gr IMR 7828ssc with Hammer 181gr, Norma brass, Fed 215 primers, Lilja 26" three groove 3140 fps with low es and sub moa. 79.0gr h-1000 is 100 fps~ slower for me in the same rifle but similar accuracy. Temp curve for IMR 7828ssc is similar to H-1000 I have determined for me also.

 

[hunter0528]

I use the H1000 at 74.5 and Hornady's ELD-X 200gr. My Blazer puts this into .5 at 100 consistantly. Velocity spread is about 25fps

 

[johnnyk]

I gave the above advise about H1000 because you were already using it but I'm using RL26 (75.0gn) with 215gn Berger Hybrid. My barrel (28" Pac-Nor, 1-9t, 5g) and this load averages 3045fps with no discernible pressure signs.
Zeroed at 300yds, I'm using less than 20MOA (on average) to get to 1K. I may stick with the Hybrid's but I tried 212gn ELD-X with the same load and the ES/SD were way better, as in single digits (and way cheaper).

 

[Overkill338]

I find H1000 lots to swing quite a bit, as does H4350 and Retumbo.

That's putting it lightly. I had Retumbo go from no pressure signs at all in the Winter, and stuck my bolt close to summer.

 

[Danny Butler]

RL26 is a bit temp sensitive. It will produce better velocity than the H1000....but the bolt will be a little sticky in the warmer months. In the .300 Win Mag the IMR 4350 will push the 180s around 3100 FPS.

 

[Shane Lindsey]

175 LRX
77gr H1000 Federal Nickel cases(about all that would fit, crunching powder)
CCI mag primer
2907 FPS
With Norma cases I got 78gr H1000

75.5gr RE22 with the above gets me 3150 or so.

In my neck of the woods, the RE22 should be fine as 300 yards would be a loooong shot.

 

[Buellbeast]

I just found 79 grains of H1000 to be the best for me. I'm shooting an X-Bolt 300 Win Mag with a 26" barrel. The bullets I like are the ACCUBOND LR 210's and I shot a 1/4" group at 100yds with .035" off the lands. I thought I was going to shoot my barrel off till I found this sweet spot. The pic below is a 3 rd shot group.