300 Norma Mag

#1,301
mike10 said:
Just found out my Lapua brass necks is about .017 thick. So, with a .336 bushing, I should get a .302 mandrel since .017*2=.034 and .336-.034= .302? Am I missing something?
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You need to decide how you want to set your neck tension, either with a bushing or a mandrel, but not both. If you're loaded rd measures .340 and you're using a .336 bushing, you have .004 neck tension and a .302 mandrel won't even contact the inside of the neck. There is no .302 mandrel that I'm aware of anyway.

Picking a mandrel to set tension is as easy as measuring the diameter of the bullets your using and subtracting the difference to get your desired neck tension. If you are measuring your bullets at .3075, then your mandrel is .3055, if they are .308, then your mandrel is .306.
 
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#1,302
mike10 said:
Just found out my Lapua brass necks is about .017 thick. So, with a .336 bushing, I should get a .302 mandrel since .017*2=.034 and .336-.034= .302? Am I missing something?
Click to expand...
Find out your chamber neck dimensions. A lot of norma reamers are 342-343 neck diameter as early lapua was near 338 loaded diameter. If your necks are 0.017 the loaded neck will be close to 342. You may need to neck turn for adequate clearance. Not the first I'd have heard of this happening with recent production lapua 300 nm brass.
 
#1,303
I neck turn all my lapua brass in 300NM on the neck/shoulder junction after 5 th firing to remove the donut .I use 0.335 bushing and that’s it .
 

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#1,305
Kind of a random post but for those with barrel life questions, my 300 Norma barrel died this weekend. It was showing signs of death at about 750 rounds but confirmed dead right at 800. Pretty consistent with my load. Lapua brass/ 83.0 H1000/ 230 gn ATip or 230 gn Hybrid. Both around 2,950 fps. When it was put together there wasnt that much info out there on real world barrel life but here it is.
Now to rebarrel in 300 Norma or 338 Lapua?
 
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#1,309
Rebelirons said:
Kind of a random post but for those with barrel life questions, my 300 Norma barrel died this weekend. It was showing signs of death at about 750 rounds but confirmed dead right at 800. Pretty consistent with my load. Lapua brass/ 83.0 H1000/ 230 gn ATip or 230 gn Hybrid. Both around 2,950 fps. When it was put together there wasnt that much info out there on real world barrel life but here it is.
Now to rebarrel in 300 Norma or 338 Lapua?
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How fast did you tend to shoot it? Did it get hot often? I'm running an almost identical load and speed with a 26" barrel.
 
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#1,311
My barrel in 28”. I could’ve just got a softy? Who knows but it went from shooting tight little clovers to 3” at 100yds. First started seeing fliers and then all of the sudden it opened up. The earlier speeds were about 3050 with 230 ATips, 83.0 H1000, 9t Bartlien. Like i said it started to slow down at around 650 and this weekend it clocked in at 2900 with the same load.
Even took the brake off to see what would the group would look like and damn! Maybe 9” cxc group of 5 shots
 
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#1,316
Grrbrrr said:
What’s everyone’s thoughts on n568 with 245’s 30” 1:9? Anyone have data?

Tried h1000. Getting pressure down to 79g
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You're better off with 568. Ive been wanting to try 568 but I'm easily pushing 245s W/N570 @2930 tru a 26" with exceptional precision. My ladder took me to just past 3K but the node was at 2930.
Also consider N170
 
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#1,318
That
Grrbrrr said:
What’s everyone’s thoughts on n568 with 245’s 30” 1:9? Anyone have data?

Tried h1000. Getting pressure down to 79g
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That's 4 grains over Hogdgon H1000/2217 load data, you should really be using Retumbo/2225 or H50BMG/2218 if you want to use ADI manufactured powder. Only the 50BMG data goes that high on the Hodgdon site, 2 steps slower. Where did you get your data, that's way out?


Screenshot_20240624_205955_Chrome.jpg
 
#1,327
4O6shootist said:
Man that seems a lil short honesty. My Norma imp went 900 running shit pretty hot with N570. 215s at 3170 and 230s at 3090fps. 26" proof 9tw
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Buddies died at about 800 rounds also. 250 A-tips with 85gr N570.
My 30 Sherman Mag died right around the same time, a little less powder but same velocity. Both of them started blowing up bullets and no amount of cleaning would stop it. They get run pretty hard at NF and KRG.
 
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#1,328
ForgeValley said:
I didn't look back through, what kind of speeds were you seeing with 565?
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My buddy I know he runs 88 grains of n570 245 bergers he's right at 3000 feet with his improved. 30 inch barrel if I remember correctly. I never ended up doing a full load development I had some issues and needed to save barrel life I ended up 79 grains n565 245 berger 2867 avg. It just hammers and stays in tune so I didn't mess with it before the nightforce. I need to redo the load but already have close to 700 rds on it so prolly not worth it.
 
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#1,334
Dogtown said:
www.bluecollarreloading.com

Berger 30cal 208gr Long Range Hybrid Target

Product Information: Caliber: 30cal Bullet Diameter: 0.308" Bullet Weight: 208 Grains OAL: 1.575" Bullet Style: Long Range Hybrid Target Recommended Twist Rate: 1 in 10" or faster G1 BC: 0.689 G7 BC: 0.354 Part Number: 30485 or 30785 Quantity: 100 or 250
www.bluecollarreloading.com www.bluecollarreloading.com

220 LRHTs
Click to expand...
I have the components. Looking for others that have ran this combo. Thanks.
 
#1,335
wanderlusted said:
From Berger, use at your own risk!
View attachment 8485258
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Just looking at the ADI manufactured powders, but seems to be across the board, Hogdgon loads only seem to to go to around 60,000psi, but even if you extrapolate to ~64,000psi the Berger numbers seem to be a decent chunk beyond that so I'd definitely want to start at the bottom of those.
 
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#1,336
Slides said:
Just looking at the ADI manufactured powders, but seems to be across the board, Hogdgon loads only seem to to go to around 60,000psi, but even if you extrapolate to ~64,000psi the Berger numbers seem to be a decent chunk beyond that so I'd definitely want to start at the bottom of those.
Click to expand...

The Berger data is known to blow primers even at the starting load
 
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#1,337
I can tell you this much. I ran Lapua brass, Federal 215M and 245 Bergers with 87.0 grs of N570 and never had any pressure issues. The starting load of 83.5 with the 220 and N570 seems useable. Can't speak for other powders or combinations.
 
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#1,338
The Berger stuff seems pretty hot.

I currently use 83.0 grains of N570 with 220 LRHTs, and that's fast enough for me. That pushes them about 2920 fps out of my 28" barrel.

I think people tend to push the .300NM pretty hard, well into pressure. Some of the velocities and powder charges I see posted make me cringe.

If you really want to see people flirting with pressure, check out the long range hunting forum. I think people are pushing 230's above 3150 fps over there 😳
 
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#1,339
kthomas said:
The Berger stuff seems pretty hot.

I currently use 83.0 grains of N570 with 220 LRHTs, and that's fast enough for me. That pushes them about 2920 fps out of my 28" barrel.

I think people tend to push the .300NM pretty hard, well into pressure. Some of the velocities and powder charges I see posted make me cringe.

If you really want to see people flirting with pressure, check out the long range hunting forum. I think people are pushing 230's above 3150 fps over there 😳
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100% agree. I think the lapua cases hold and hide pressure and people go crazy!! I see some pretty crazy things with other cases too
 
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#1,341
kthomas said:
The Berger stuff seems pretty hot.

I currently use 83.0 grains of N570 with 220 LRHTs, and that's fast enough for me. That pushes them about 2920 fps out of my 28" barrel.

I think people tend to push the .300NM pretty hard, well into pressure. Some of the velocities and powder charges I see posted make me cringe.

If you really want to see people flirting with pressure, check out the long range hunting forum. I think people are pushing 230's above 3150 fps over there 😳
Click to expand...
That's definitely a cupcake load if you're talking 300 NMI, I too ran 245 eols with 87 grains N570 without the slightest pressure signs, I tested that load in a single lapua case over and over again and it's at 21 reloads now and primers are tight as new.

That said I've settled on 81 grains H1000 with the 245s going 2820 and a ridiculous ES of 5! I took that load out to 1585 a few weeks ago and was 3 for 4 on a 15" target.
Chasing max speed is a waste of time.
 
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#1,342
762 ULTRAMAGA said:
That's definitely a cupcake load if you're talking 300 NMI, I too ran 245 eols with 87 grains N570 without the slightest pressure signs, I tested that load in a single lapua case over and over again and it's at 21 reloads now and primers are tight as new.

That said I've settled on 81 grains H1000 with the 245s going 2820 and a ridiculous ES of 5! I took that load out to 1585 a few weeks ago and was 3 for 4 on a 15" target.
Chasing max speed is a waste of time.
Click to expand...

Oh yeah, my load is definitely a "cupcake load" - its nowhere near pressure. You can definitely push a 220 much faster than I currently am and still be okay pressure wise. Mines not an NMI btw.

I agree on the last statement. People love to chase max speed - especially in these fast magnums used for ELR type work where speed is everything.
 
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#1,345
Ok so i have 230 grain berger OTM and sig brass. school me. I have h1000 and retumbo. what are we thinking? Also on a side note with sig brass anyone have recs on bullets? I am completely ready for a new load development
 
#1,350
michasco1 said:
Ok so i have 230 grain berger OTM and sig brass. school me. I have h1000 and retumbo. what are we thinking? Also on a side note with sig brass anyone have recs on bullets? I am completely ready for a new load development
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I don't use H1000 or Retumbo in the 300 Norma but I have found it to be very easy to tune cartridge. In one of my rifles I use Norma 217 with 230 grain A-tips with 86.9 grains shoots amazing (3063 fps) and I would not recommend for anyone to run this load in another barrel. Because it is impossible to find this powder anymore, I have been experimenting with different powders in another rifle still a work in progress due to time constraints.

For this rifle, also chambered in 300 Norma I am using a 26" CA carbon fiber barrel. I tried 85-87 grains of VV N570 and BMG 50 with 225 gr. ELD-Ms all of which shot very well across the entire range. The velocity with BMG 50 was too low so I need to run more tests at higher charge weights.

I would recommend you try Retumbo with the 230 gr. berger (I think Retumbo will give you better case fill). Any quality brass should work, I recommend you anneal and bump the shoulder 0.002" so as to minimize brass wear. Attaching someone else's information previously presented on this forum:

1726317808563.png


Hope this helps...
 
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