Best powder for LR 300 win mag

[Timber338]

In the process of getting all the reloading components together to reload for a custom LR 300 win mag. I am planning on shooting either a 210 or 215 grain bullet (berger or nosler ALR... can't find either in stock), and was wondering what powders you guys would recommend.

I've got some H1000 that I was going to start with... any thoughts on Retumbo? too slow?

Any starting loads with these bullets seated out far would be appreciated as well...

Thanks!

 

[joe0121]

I don't think I am alone in saying H1000 is plain awesome in the 300 WM with heavy VLD's assuming you have a decent length barrel.

Some people say it is too slow burning, and for bullets 180GR and lighter or barrels shorter than 26" I tend to agree. It is very temp stable and I find with 208GR amax seated to normal mag length 79.5 GR with CCI Br2 primer got me into the mid 2900's shooting 1/3 MOA.

 

[jkrueger]

H1000 behind 215's is working like a charm for me

 

[Broz]

Another H-1000 shooter. I have worked it up in numerous 300 wins with 210 to 230 gr bullets with excellent results.

Jeff

 

[Timber338]

Thanks guys. It sounds like H-1000 really is the ticket.

My first bullet choice would be the Berger 215 Hybrid... Anybody know where I can find some in stock? I've called all my local gun shops, and no luck.

 

[4xforfun]

I gotta say RL-22.

 

[joe0121]

I gotta say RL-22.

RL-22 seems to get better speed and some say the best accuracy. I found it to be too finicky with temp changes here in Ohio. Still you could do A LOT worse. I also think it is a bit cheaper than H1000?

 

[brentc]

H4831sc works really well in the 300 WM too.

 

[rinodods]

H1000 here as well. Works great for the 208 AMAX. Running 77gr. Went as high as 78 but things started getting sticky for me. Winchester brass and CCI 250 primers. Shoots pretty dependably. Anything under 700 yards is kind of boring with it. gun)

 

[Timber338]

Thanks for the input and load data. Finally heard from my gunsmith and my custom 300 win mag is finally going to ship out next week.

I have 210 and 215 Bergers on backorder right now, and the only bullets I've got in hand are some 210 Nosler ALRs. So I'm going to start with the ALRs and H1000.

Sounds like a good starting load would be 73 grains of H1000 to be safe and break in the barrel, and then work up from there...

I'm a little hesitant to start with the ALRs since they have no track record, but I don't think I have the patience to wait any longer for the Bergers.

 

[MudRunner2005]

Load devolping for my buddy's .300 WM (I reload his ammo for him, since he doesn't have the coin for a nice setup right now), we have discovered that H1000 and Reloder 22 are the most consistant in his rifle with his bullet of choice (Hornady 178 A-Max).

Hope this helps.

 

[joe0121]

Thanks for the input and load data. Finally heard from my gunsmith and my custom 300 win mag is finally going to ship out next week.

I have 210 and 215 Bergers on backorder right now, and the only bullets I've got in hand are some 210 Nosler ALRs. So I'm going to start with the ALRs and H1000.

Sounds like a good starting load would be 73 grains of H1000 to be safe and break in the barrel, and then work up from there...

I'm a little hesitant to start with the ALRs since they have no track record, but I don't think I have the patience to wait any longer for the Bergers.

[ame=http://www.youtube.com/watch?v=f_LvPjreNjg]AR10 Noveske Match Barrel Break In - YouTube[/ame]
IMO Barrel break in is a waste of time. Shoot it clean it.

 

[Timber338]

IMO Barrel break in is a waste of time. Shoot it clean it.

I actually agree ... my "break in" plan was 5 rounds at 73 grains to get it sighted in, check velocity, get a feel for the gun, and calm my excitement that's been building for 14 months waiting for this dang gun!

Then a ladder test with 2 shots each from 73.5 up to 77.0 grains of H1000 to find (hopefully) a sweet spot. I feel safe starting at 73 grains, but nearly impossible to determine max considering this is a brand new gun shooting a brand new bullet...

 

[MOOSE39465]

After reading a bunch of post about what is the best powder for the 300 win mag. I picked up both H1000 and RL22. As far a accuracy goes the RL22 was the best hands down. So my vote goes to RL22.

As far as barrel break in I personally don't believe in it.