300 Norma with N570 loads

[Matt_3479]

Talking about a standard 300. Norma. I was 3/4 the way through load development with rl33 when I read how unstable it was and decided to try n570 instead. Loading 215’s right now and need load data. Well try 230’s as well!

 

[LA50SHOOTER]

The 20+ pounds of Reloder 33 that I’ve shot so far haven’t been “unstable”.
im not sure that RL-33 is the “go-to” powder in a straight 300 Norma with 215’s, but unstable, I would not be so quick to buy into that.

 

[FURMAN]

I can tell you the couple loads I developed with RL33 were showing near 2fps per degree change. Not anywhere near stable in my book. N570 on the other hand has been well under 1fps/degree and usually closer to .6-.7 in the few loads I have shot it in. Based on what I have seen/read it seems as if RL33 is more dependent on the fill rate of the cartridge and bullet weight used where I have not seen or experienced that with other powders. I personally would stay with N570.

 

[LA50SHOOTER]

I can tell you the couple loads I developed with RL33 were showing near 2fps per degree change. Not anywhere near stable in my book. N570 on the other hand has been well under 1fps/degree and usually closer to .6-.7 in the few loads I have shot it in. Based on what I have seen/read it seems as if RL33 is more dependent on the fill rate of the cartridge and bullet weight used where I have not seen or experienced that with other powders. I personally would stay with N570.

Possibly Indeed. - The loads I’ve ran RL-33 in the 338 Lapua Imp. and a 28 Nosler (both with longer barrels) the fill rate is +95% and heavier bullets are used.
N-570 is an excellent slow burning powder for large capacity cases, but it isn’t easy to come by.

 

[Alex Wheeler]

RL33 is very stable in my 338 lap imp. I dont know about hot temps but in the mild to cool temps it beat h1000 for day to day velocity stability. I believe the reports of it being sensitive for some guys, but I think you need to test it in your chambering and conditions to see how it does.

 

[FURMAN]

RL33 is very stable in my 338 lap imp. I dont know about hot temps but in the mild to cool temps it beat h1000 for day to day velocity stability. I believe the reports of it being sensitive for some guys, but I think you need to test it in your chambering and conditions to see how it does.

Based on the reports like this and those of others I would agree. RL26 is another example some claim poor temp stability but in the 5 or 6 loads I have tested it has been very stable.