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The AXSA just got a straight tube 6.5. I wish it was 7 or 7.5T but at the time of ordering I got an 8T with plans to only shoot 140s. Going to try the 153s, but I’m not too confident they’ll stabilize properly.

Barrel is THICK. Makes the AXSR HV barrel look tiny 😂
 

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The AXSA just got a straight tube 6.5. I wish it was 7 or 7.5T but at the time of ordering I got an 8T with plans to only shoot 140s. Going to try the 153s, but I’m not too confident they’ll stabilize properly.

Barrel is THICK. Makes the AXSR HV barrel look tiny 😂
After having a straight contour for a while, looking at a normal contour looks odd.
1748022560433.jpeg
 
So I went ahead and ordered an L. E. Wilson expander die and mandrel as well as a case gage. They are on the way. I will see what the expander mandrel does and go from there. I wanted the Sinclair Gen 2 expander die and mandrel but they have been out of stock for a while. I have a feeling I will be ordering more mandrel and case gages in the future. I will also be full length sizing all cases from now on before I prime them.

Is that Geissele?
 
18% more powder for only about 125fps gain over 300prc
I can understand. I’ve been back and forth so many times. I’ve got 60 rounds of ammo (Berger 215 handloads in Peterson brass left over from previous 300NM barrel I sold) as well as the bolt for my AXSR and 300NM dies so I’ve been leaning towards getting that barrel. Plus there’s several in stock I’d be happy with.

That being said I haven’t pulled the trigger on said barrel yet because deep down I fear 300PRC makes more sense. I can get dies, and only 60 rounds/brass isn’t a ton. I can find a .300 bolt for my ASXR. So…..

Damn. This is tough.
 
Everyone I know (only a few) says that the effort to fireform, cost of dies and any other brass prep tool, does not warrant the minimal velocity increase. About the only good thing with 300NMI is the reduced brass growth. They all say it's the worst cartridge to improve.

My buddy's 28" 300NMI with N568, 245 LRHTs was 2970, vs my standard 27" 300NM 250 Atips, with RL50 at 2930.

20250512_183049.jpg
 
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Everyone I know (only a few) says that the effort to fireform, cost of dies and any other brass prep tool, does not warrant the minimal velocity increase. About the only good thing with 300NMI is the reduced brass growth. They all say it's the worst cartridge to improve.

My buddy's 28" 300NMI with N568, 245 LRHTs was 2970, vs my standard 27" 300NM 250 Atips, with RL50 at 2930.

View attachment 8694119

Nailed my experience
 
Everyone I know (only a few) says that the effort to fireform, cost of dies and any other brass prep tool, does not warrant the minimal velocity increase. About the only good thing with 300NMI is the reduced brass growth. They all say it's the worst cartridge to improve.

My buddy's 28" 300NMI with N568, 245 LRHTs was 2970, vs my standard 27" 300NM 250 Atips, with RL50 at 2930.

View attachment 8694119
Yeah, not much of a improvement. I'm running N570 with the 245s 2950ish out of a normal 300NM on a 26" barrel. Took a lot of different combos to get there, and had to have my freebore extended, but it's happy now. Just counting down the rounds when N570 is going to kill this barrel.
 
Everyone I know (only a few) says that the effort to fireform, cost of dies and any other brass prep tool, does not warrant the minimal velocity increase. About the only good thing with 300NMI is the reduced brass growth. They all say it's the worst cartridge to improve.

My buddy's 28" 300NMI with N568, 245 LRHTs was 2970, vs my standard 27" 300NM 250 Atips, with RL50 at 2930.

View attachment 8694119
Curious - with AXMC/AXSR, where is the juice vs the squeeze over the 300NM? Or is there?
 
Yeah, not much of a improvement. I'm running N570 with the 245s 2950ish out of a normal 300NM on a 26" barrel. Took a lot of different combos to get there, and had to have my freebore extended, but it's happy now. Just counting down the rounds when N570 is going to kill this barrel.
Do you track throat erosion?
With RL50, I was only getting 0.003" every 100 rounds. But with the factory Berger 230, which I assume is H1000, I was getting 0.008" which was the first rounds fired then the 300-400, it was 0.006". I'm at 600 rounds now and the last 200 with RL50 I've only had 0.001" totaling 0.023" total erosion since the new barrel.

I know N570 is a barrel burner, but just curious to how it compares to other powders.

Curious - with AXMC/AXSR, where is the juice vs the squeeze over the 300NM? Or is there?
I don't think there is any benefit aside from reduced brass growth. With my 300 NM (Lapua brass) I have to trim about 0.004" after every firing (annealed each firing). I don't remember how much I trim above min SAAMI length (+0.002 to 0.005), but it's just to be consistent between each firing.