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Join the contest SubscribeCartridge : .300 Precision Rifle Cartridge
Bullet : .308, 230, Hornady A-TIP 3091 G7
Useable Case Capaci: 85.686 grain H2O = 5.563 cm³
Cartridge O.A.L. L6: 3.830 inch = 97.28 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Vihtavuori N565 *C
Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !
Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms
-20.0 74 60.00 2152 2365 26961 9758 90.8 1.952
-18.0 76 61.50 2206 2486 28688 10081 92.0 1.905
-16.0 78 63.00 2261 2610 30516 10394 93.1 1.858
-14.0 80 64.50 2315 2738 32457 10698 94.2 1.813
-12.0 81 66.00 2370 2868 34517 10990 95.2 1.769
-10.0 83 67.50 2424 3002 36703 11270 96.1 1.726
-08.0 85 69.00 2479 3138 39021 11537 96.9 1.676
-06.0 87 70.50 2533 3278 41482 11788 97.6 1.626
-04.0 89 72.00 2588 3420 44092 12025 98.2 1.579
-02.0 91 73.50 2642 3564 46863 12244 98.8 1.533
+00.0 92 75.00 2696 3711 49804 12445 99.2 1.489
+02.0 94 76.50 2749 3861 52927 12628 99.5 1.446
+04.0 96 78.00 2803 4012 56246 12791 99.8 1.405 ! Near Maximum !
+06.0 98 79.50 2856 4166 59774 12934 99.9 1.365 ! Near Maximum !
+08.0 100 81.00 2909 4321 63527 13055 100.0 1.327 ! Near Maximum !
+10.0 102 82.50 2961 4478 67523 13161 100.0 1.290 !DANGEROUS LOAD-DO NOT USE!
Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 92 75.00 2827 4081 60410 12038 100.0 1.367 ! Near Maximum !
Data for burning rate decreased by 10% relative to nominal value:
-Ba 92 75.00 2512 3224 39541 12165 93.6 1.650
Cartridge : .300 Precision Rifle Cartridge
Bullet : .308, 230, Hornady A-TIP 3091 G7
Useable Case Capaci: 85.686 grain H2O = 5.563 cm³
Cartridge O.A.L. L6: 3.830 inch = 97.28 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Vihtavuori N570 *C
Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !
Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms
-20.0 79 65.60 2194 2458 26474 10646 84.5 1.919
-18.0 81 67.24 2255 2597 28269 11065 86.2 1.869
-16.0 83 68.88 2316 2740 30195 11477 87.7 1.821
-14.0 85 70.52 2379 2889 32262 11880 89.2 1.774
-12.0 87 72.16 2441 3043 34481 12271 90.6 1.728
-10.0 89 73.80 2504 3202 36865 12650 92.0 1.682
-08.0 91 75.44 2567 3366 39429 13013 93.2 1.627
-06.0 93 77.08 2631 3535 42189 13359 94.4 1.575
-04.0 95 78.72 2695 3709 45162 13686 95.4 1.524
-02.0 96 80.36 2759 3887 48371 13992 96.4 1.475
+00.0 98 82.00 2823 4070 51830 14276 97.2 1.428
+02.0 100 83.64 2887 4257 55576 14535 98.0 1.382 ! Near Maximum !
+04.0 102 85.28 2951 4448 59605 14768 98.6 1.338 ! Near Maximum !
+06.0 104 86.92 3015 4644 63928 14974 99.1 1.296 ! Near Maximum !
+08.0 106 88.56 3080 4843 68590 15149 99.5 1.255 !DANGEROUS LOAD-DO NOT USE!
+10.0 108 90.20 3144 5047 73625 15294 99.8 1.215 !DANGEROUS LOAD-DO NOT USE!
Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 98 82.00 2995 4580 64900 14070 100.0 1.300 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 98 82.00 2594 3435 40502 13486 88.8 1.593
looks like n570 wins
Cartridge : .300 Precision Rifle Cartridge
Bullet : .308, 230, Hornady A-TIP 3091 G7
Useable Case Capaci: 85.686 grain H2O = 5.563 cm³
Cartridge O.A.L. L6: 3.830 inch = 97.28 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Vihtavuori N565 *C
Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !
Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms
-20.0 74 60.00 2152 2365 26961 9758 90.8 1.952
-18.0 76 61.50 2206 2486 28688 10081 92.0 1.905
-16.0 78 63.00 2261 2610 30516 10394 93.1 1.858
-14.0 80 64.50 2315 2738 32457 10698 94.2 1.813
-12.0 81 66.00 2370 2868 34517 10990 95.2 1.769
-10.0 83 67.50 2424 3002 36703 11270 96.1 1.726
-08.0 85 69.00 2479 3138 39021 11537 96.9 1.676
-06.0 87 70.50 2533 3278 41482 11788 97.6 1.626
-04.0 89 72.00 2588 3420 44092 12025 98.2 1.579
-02.0 91 73.50 2642 3564 46863 12244 98.8 1.533
+00.0 92 75.00 2696 3711 49804 12445 99.2 1.489
+02.0 94 76.50 2749 3861 52927 12628 99.5 1.446
+04.0 96 78.00 2803 4012 56246 12791 99.8 1.405 ! Near Maximum !
+06.0 98 79.50 2856 4166 59774 12934 99.9 1.365 ! Near Maximum !
+08.0 100 81.00 2909 4321 63527 13055 100.0 1.327 ! Near Maximum !
+10.0 102 82.50 2961 4478 67523 13161 100.0 1.290 !DANGEROUS LOAD-DO NOT USE!
Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 92 75.00 2827 4081 60410 12038 100.0 1.367 ! Near Maximum !
Data for burning rate decreased by 10% relative to nominal value:
-Ba 92 75.00 2512 3224 39541 12165 93.6 1.650
Yes it isIs this from Quickload? Data lines up pretty darn well with my results so far out of a 26" barrel with N565.
I have some Berger 155.5 that I want to burn up for barrel break in and fire forming. Have Retumbo to drive them. Hodgdon's load calculator doesn't have a 155.5/Retumbo spec (or anything below a 168 bullet). The 168/Retumbo spec is at 81.2 gr for starting load. I was thinking of going even a bit lower at 80 gr to break in/fire form. Thoughts on this combination?
Yeah, what he said!!I would not go below the 80gr. point, you will have the chance of not fire forming brass at that low loading. If you shoot suppressed, you will see why. I would start at least 1 gr. over the 168 data to start.
Of course, depending on that powder and case capacity with that bullet type. Just trying to make sure of no wasted time and effort.
I would not go below the 80gr. point, you will have the chance of not fire forming brass at that low loading. If you shoot suppressed, you will see why. I would start at least 1 gr. over the 168 data to start.
Of course, depending on that powder and case capacity with that bullet type. Just trying to make sure of no wasted time and effort.
I’m in the process of convincing myself that I need a 300PRC barrel for my Desert Tech. Wanting to go with a 22.5” barrel to keep things compact and save a little weight. Thinking I should be able push a 210 VLD about 2850 to 2900 fps using RL26. Does that sound about right. Also thinking I could go with a heavier bullet if I want which should be fine for hunting. I have other barrels for the DT and other rifles to fill other needs so I’m not looking for the 300 PRC to cover all the bases. Any comments or suggestions would be welcomed.
That’s only 3 grains over max published load... probably just a tad hot![]()
Apparently your barrel is bigger than mine?
Mine preferred 76.7 h1000 at 3.720 bit slower but shoots goodApparently your barrel is bigger than mine?
I got that load from @Pools1 no testing, just loaded it and shot it.
My money would be on a Nemo.
Ok...I'm about as crazy as anyone....but a 300PRC AR?.....I gotta ask... Why?
because you can?Ok...I'm about as crazy as anyone....but a 300PRC AR?.....I gotta ask... Why?
Anybody have an info on temp stability of n565 vs rl26?
Well...back from the range with some data. Today didn't go like I thought it would. First off...let's look at some speeds...and let's clarify the environmentals.
Temp: 49F
Elevation: 913ft ASL
Pressure: 30.13
Humidity: 68%
Winds: 7mph steady right to left....full value wind.
Brass: ADG Virgin brass. Was full length resized mostly due to the necks being a little small...a little too tight for the the bullets.
Bullets: Hornady A-Tip 230gr
Primer: FGMM 210M
Case Over ALL Length: 3.8050"
Gun: 300PRC Defiance Deviant with 28" Bartlein 1-9tw. TriggerTech Diamond. Lil'B brake. MDT ACC Chasis.
Scope: Vortex Viper PST Gen2 3x15 EBR-2C
Ok...now let's talk about powder. I took Vhitavouri N565 and Reloader 26 and loaded 76-79 grains in .5 increments. Then I arbitrarily before hand loaded 5 of each powder at 77.0 grains and 78.0 grains. Now let's look at the numbers.
Vhitavouri N565
1. 76.0gr 2863fps
2. 76.5gr 2853fps <-- weird
3. 77.0gr 2882fps
4. 77.5gr 2898fps
5. 78.0gr 2917fps <-- ejector marks
6. 78.5gr 2916fps <-- ejector marks
7. 79.0gr 2940fps <-- ejector marks and a swipe
All above shot at large center of middle diamond.
Next a 5 shot group of 77.0 grains of N565
1. 2877fps
2. 2879fps
3. 2877fps
4. 2878fps
5. 2879fps
Ok...incredible SD's there....man that looks good....but had a flyer...could have been me...but during loading, some of the seating pressures were extremely tough compared to others. Being virgin brass...I'll give the low flyer a pass...but the group looked promising. Group is located in the upper right diamond.
Next a 5 shot group of 78.0 grains of N565
1. 2924fps
2. 2921fps
3. 2922fps
4. 2919fps
5. 2915fps
Again...nice consistent velocities for virgin brass....but small sample size....however...the group is horrible. Top left Diamond. Looks like a shotgun pattern. Not one single hole touching another. Barrel was cooled between all groups today. I'm not liking the looks of that group vertically.
N565 Target Pic:
View attachment 7270975
What's that in the bottom right? It is a 'control' group...heh...actually it is 5 rounds of mixed powder and bullets that I was fouling the barrel with. I had just done a good scrubbing of the barrel the night before. You don't see 5 holes? The first shot was off paper to the right due to not looking at my scope dials and having the windage turrets moved 2 mils. IT's good to have those mistakes when not on the clock...when it doesn't matter.
Now....let us look at Reloader 26. The super unicorn stuff that I haven't had the pleasure of running in a 300PRC with a 230 grain A-Tip.
Again....loads from 76 to 79 grains in .5 grain increments. On target: Center large diamond.
1. 76.0gr 2932fps <---Well hello
2. 76.5gr 2946fps
3. 77.0gr 2964fps <---check for pressure...pressure ok
4. 77.5gr 2984fps <---check for pressure...still ok
5. 78.0gr 3005fps <---check for pressure....still ok...hmmm
6. 78.5gr 3033fps <---check for pressure...slight swipe visible.
7. 79.0gr 3071fps <---Holy crap....check for pressure...slight swipe visible....the last two the recoil had more of a snap.
Ok...I thought N565 was the answer to all my ills...but this RL-26 Unicorn Dust is looking like the real deal...so let's go shoot some 5 shot groups.
5 Shots of 77.0 grains of Reloader 26. On target: Bottom right hand diamond.
1. 2976fps
2. 2965fps
3. 2976fps
4. 2980fps
5. 2975fps
Well I can live with that. Pretty tight group...I know I caused that flyer by slapping the trigger...called it when I shot it.
5 Shots of 78.0 grains of Reloader 26. On target: Bottom left hand diamond.
1. 3028fps
2. 3031fps
3. 3029fps
4. 3031fps
5. 3030fps
Well...the speeds look fast...and consistent. I like that. The group looks pretty good too. The flyer wasn't me this time...well it could be...but I didn't call it when I shot...and everything felt good. Recoil pulse felt good. All brass looked good.
Reloader 26 Target:
View attachment 7270985
So...this is a VERY small data set. However, RL-26 with these 230 grain A-Tips look real promising for the upcoming ELR events. I'll take this now fire formed brass and do some more load development in the coming week and see if the data stays the same or changes slightly.
It was a fun day....kinda cloudy and a chill in the air...but it beats having to go to work today.
This is super impressive.... I’m having a barrel done but all these powders have been impossible for me to find.