It's Lapua brass and that was first firing from virgin cases. Haven't done any brass prep on them until I'll use up what I have left and then I'll clean, size and see where I'm at.
It's Lapua brass and that was first firing from virgin cases. Haven't done any brass prep on them until I'll use up what I have left and then I'll clean, size and see where I'm at.
AI tends to give you hard bolt lift sometimes if your shoulder clearance is that tight. Try .003”-.004” and you’ll be happy.
I have 8 pounds of N568, but I have been using retumbo and getting 3050fps with 230 a tips and shoots .2” groups. What data have you got with the n568? What velocitys are you seeing and how’s the accuarcy?
TIA
Just put together a 300 Norma and doing some load experimentIng. Trying some 50 BMG based off of a buddy’s experience but Im not sure I’m gonna get enough velocity out of it before I’m crushing powder. Hopefully the barrel speeds up a bit.
New Barrel 30in 1-8 new Bartlein steel spun up by Dave Tooley for my AI-PSR. With just 62 round on the barrel its already looking good shot 3 -3 round groups under 1/3 moa. The groups tightened up when I went from 20 to 10 off the lands. Will update once I have gone though the brass once. With the size of the kernels there is no issue with case fill.
Norma Brass
Berger 230's
WLRM
N568 86.2
AVG FPS 2954
SD 6.3
COAL 3.604
Norma Brass
Berger 230's
WLRM
N568 86.2
AVG FPS 2954
SD 6.3
COAL 3.604
Last edited:
I use .1 off the lands and 82.7 Retumbo @ 3.6 OAL with 250 A-tip. Gives 2820 FPS with 5-7 SD and Sub 12 ES. 28" ES Tactical barrel.
I have had really good luck with H50BMG and 250 grain atips. For me Retumbo or H1000 are slightly faster for the 215-230 grain bullets. I have never tried any N570 b/c it has been unobtainium for the last year. Practically speaking, H50BMG and Atips have been more readily available as compared to Berger bullets and Vihtavori powder. Of course currently the limiting factor for my 300 Norma is large rifle primers.
Tried some 245’s and 570 today got up around 3000fps and the brass looks fine. Noticed every once in a while I was getting some clickers this was once fired Lapua brass I bought off a forum. Sounds like the Bullet Central sizing doesn’t will fis this issue and size my brass down closer to the web? Anyone have experience with this same issue? Thanks
250 ATIP w/ 83.5 N570 at 3.58 OAL (.1 off) gives 2998 w/ 30 inch structured barrel out of an AXSR. 3-4 SD and 1/4-1/2 MOA. Lapua brass, 215M primer.
Late to the party, but why do you believe H4350 is going to burn out the barrel? Best I can tell, its heat potential is actually less than most popular powders for the 300NM and you use 10% less - so my understanding is the barrel would actually last longer (I'm very open to hearing why it would burn the barrel quicker because I agree, it seems counter-intuitive to what I would expect).
Hodgdon H1000 - 3630 kJ/kg
Vihtavuori N570 - 3950 kJ/kg
Hodgdon Retumbo - 3710 kJ/kg
RL33 - 3900kJ/kg
Hodgdon H4350 - 3760 kJ/kg (close to Retumbo)
220 SMKs tend to want to stay in the 3k range from what I've tested - and admittedly shoot slightly better with the H1000 running 84-85gr. I did push them up to 3131fps with the H1000, but my SDs and accuracy went down anything hotter than 3050 (26" 1:8 twist).
Because if you look at the Quickload data Dogtown posted, near max load of 77 gr of H4350 is only giving you 2850 with a 220 gr projectile. Why waste precious barrel life on a 300 Norma for something like 300 WSM ballistics? That powder is too fast and limiting the cartridge potential and just shortening the barrel's life while your doing it.
Reminder that QL is predictive simulation, not ground truth. Actual data from shooting loads > QL.
If I get some time next week, I’ll throw some 220s and see what they do.
Dogtown - if you have some time can you run the same on the Hornady 230gr A-tips please; believe they should be about 80fps slower from the data I have running both bullets in H1000
My magnetospeed seems to read as expected with other loads, so I believe it’s working properly (I did once let the voltage on the 9v dip and without giving me a voltage warning, it started reading all over the place). I since swapped over to the Cr123s or whatever it is they recommend and it’s been solid ever since.
Finally getting settled in after moving across the country, so picked up getting my loads dialed in on the 300nm. Also found a few boxes of the Berger 230s - so excited to test those out as well
Dogtown - if you have some time can you run the same on the Hornady 230gr A-tips please; believe they should be about 80fps slower from the data I have running both bullets in H1000
My magnetospeed seems to read as expected with other loads, so I believe it’s working properly (I did once let the voltage on the 9v dip and without giving me a voltage warning, it started reading all over the place). I since swapped over to the Cr123s or whatever it is they recommend and it’s been solid ever since.
Finally getting settled in after moving across the country, so picked up getting my loads dialed in on the 300nm. Also found a few boxes of the Berger 230s - so excited to test those out as well
I just shot a local 1000 yard match today. Light wind no more than 3 mph I shot 97 3x so not a bad day.
I was shooting 230 A-Tips at 2945 AVG FPS
Load was 86.2 of N568.
I was shooting 230 A-Tips at 2945 AVG FPS
Load was 86.2 of N568.
Last edited:
77gr H4350 with 220 SMK - 3040fps
Also ran 78.5 with the 230 a-tips @ 3,004 with heavy bolt lift - so certainly over pressure. 4 shot SD was 10.14
SDs sucked on all 4 groups today - which isn’t surprising since I sold my fancy powder thrower when I moved and am awaiting a new one for Christmas
Also ran 78.5 with the 230 a-tips @ 3,004 with heavy bolt lift - so certainly over pressure. 4 shot SD was 10.14
SDs sucked on all 4 groups today - which isn’t surprising since I sold my fancy powder thrower when I moved and am awaiting a new one for Christmas
For what it’s worth, other groups:
81.5gr H4831; 230 A-tip - 2,968
84gr H1000; 220SMK - 3,038
Group size for the H1000 was the best at about .6" vs the H4831 and H4350 were both in the 1.2-1.3" range (100yards).
Next up will be the Berger's with the H1000 after christmas.
81.5gr H4831; 230 A-tip - 2,968
84gr H1000; 220SMK - 3,038
Group size for the H1000 was the best at about .6" vs the H4831 and H4350 were both in the 1.2-1.3" range (100yards).
Next up will be the Berger's with the H1000 after christmas.
Last edited:
N570 245 EOL
85.5 2969 avg 4.5/11
86.5 3004 avg 5.2/11
3 shots
85.5 2957 3.6/7
85.7 2984 .5/1. Only 2 on chrono 3 shots one hole.
85.9 2986 6.7/10 2 registered
86.1 2987 3.1/6
86.3 2994 4.5/9
86.5 2994 3.7/7
85.5 2969 avg 4.5/11
86.5 3004 avg 5.2/11
3 shots
85.5 2957 3.6/7
85.7 2984 .5/1. Only 2 on chrono 3 shots one hole.
85.9 2986 6.7/10 2 registered
86.1 2987 3.1/6
86.3 2994 4.5/9
86.5 2994 3.7/7
You've pretty much duplicated my results. It's as if that bullet/powder combo were made for the 300 Norma.
The 85.5 mark seems to be the sweet spot for the 245/N570 combo.
I know this isn't the same but in my 300 ParC with the 230 gAy Tips versus the Berger 230's I had the same results.. I had a harder time getting the seating depth down for the gAy Tips, but once I did no difference. Velocity wasn't a major difference. For what my 2 cents is worth
Looking for input on powder choice for 300NM pushing a 250 atip out of a 26" barrel. I started load development today with N568 however max charge I could load (still noticeably compressed) in the case was 86 grs. This 86gr charge only yielded 2783 fps., zero pressure signs.
I've got some retumbo I'm planning to load up for a ladder tomorrow. Curious what folks are using powder wise for the 250s? What am I missing with the N568? I was thinking It was going to be just about perfect for this load.
I was hoping to get the 250s to 2900 fps or higher if possible.
I've got some retumbo I'm planning to load up for a ladder tomorrow. Curious what folks are using powder wise for the 250s? What am I missing with the N568? I was thinking It was going to be just about perfect for this load.
I was hoping to get the 250s to 2900 fps or higher if possible.
I'm jumping the 230 gr. Atips .075 and getting similar results but my coal is 3.751. This barrel has a super long throat and I can barely get to the lands with a 230 gr. at 3.831. I've got some 250 gr. Atips coming.
Sorry for the stupid question here, does your post mean you are loading the bullet 0.100” off the lands? Like a 100 thou jump??
If I meant .01 I would have written it. The jump I use is approximately 1/10 of an inch.
With rl26 82 grains I was using lapua brass, 208 bergers, a federal lrp ang getting 3120fps with single digit sd/es shot this load at the nf match last year. Maybe start at 74 grains with a 220 and work up.
Im going to begin my load development with 250 A-Tips, Lapua Brass, CCI 250, and RE50 in my AXSR. I normally use Gordons Reloading Tool to get estimate velocities and min/max loads, which in the past have always been within approximately 10-15 fps, and accurate to seeing pressure signs as I near max pressure, but RE50 is not a listed powder, and other than one person here stating he wants to try a load in the 88-91 gr of RE50, I am not confident with where to start.
Not that's it readily available but N570 worked magic in my 300 Norma with 250 A tips. Right at 3000 fps with a 26". RL33 would also probably work well.
I think my buddy used RL33 with a 338 AI and had really good results. I'll double check.
Yes, i used a ton of RL33 but moved onto N570. I had equal results but liked the added benefit of the copper eraser in the N570 when i started playing w solids.
All those powders are unobtanium, N170, 24N41, looked promising on GRT, and have read quite a few people having good results is H50 and US869. And RE50 is supposedly a faster burning powder than those, but slightly slower than N570.
I tried a quickie work up with RL50 because I had some and N570 is unobtanium. 250gr A-Tips, Lapua Brass, Fed. 215m. 28" barrel. 1 shot with each charge weight:
81.0gr 2591 fps
82gr, 2576 fps
83gr, 2606
84, 2652
85, 2674
86, 2692
87, 2725
88, 2765
89, 2781
90, 2837
Not great but not terrible. I forget when loads started to get crunchy when seating. No idea how consistent a crunchy 90+gr of RL50 would be since I was only shooting 1 round to get a rough idea of potential velocities.
I haven't finished load dev with 250gr A-Tips and N570 but velocities were predictably better, 5-shot groups:
84.5gr, 2898 fps
85.0gr, 2906 fps, ES 7, SD 2.8. looks like an easy winner. enough velocity to do the job without pushing crazy PSI.
85.5gr, 2918 fps
86.0gr, 2913
86.5, 2932
87.0, 2942
No load I've ever shot has had pressure signs with Lapua brass and N570. I've always found velocities and stopped before pushing too hard. With 230gr Bergers 86.8gr of N570 got 3098 FPS, ES 13 SD 5.2.
81.0gr 2591 fps
82gr, 2576 fps
83gr, 2606
84, 2652
85, 2674
86, 2692
87, 2725
88, 2765
89, 2781
90, 2837
Not great but not terrible. I forget when loads started to get crunchy when seating. No idea how consistent a crunchy 90+gr of RL50 would be since I was only shooting 1 round to get a rough idea of potential velocities.
I haven't finished load dev with 250gr A-Tips and N570 but velocities were predictably better, 5-shot groups:
84.5gr, 2898 fps
85.0gr, 2906 fps, ES 7, SD 2.8. looks like an easy winner. enough velocity to do the job without pushing crazy PSI.
85.5gr, 2918 fps
86.0gr, 2913
86.5, 2932
87.0, 2942
No load I've ever shot has had pressure signs with Lapua brass and N570. I've always found velocities and stopped before pushing too hard. With 230gr Bergers 86.8gr of N570 got 3098 FPS, ES 13 SD 5.2.
Last edited:
Similar threads
