Home Forums Reloading Big Game Rifles Needed: .348 Win Data for 275gr Bullets

I had some custom jacketed bullets made. They're all 275gr 6S FN. Anyone point me in the direction of safe load data? Is it safe to use the starting loads for 250gr bullets?

Thanks, Dinny

Wow! This is quite the active subforum!

Not much data for 275s in the 348. I think Hawk makes a 270, but the only data available is if you work it up in Quick Load.

I started with H4895 by using Hodgdon's 70% rule. 42 grains got me 1835fps. I will continue going up until my chrono results tell me to stop, I lose accuracy, or I hit 2000fps.

Thanks, Dinny

Here's what QL says about H4895 with the 270 Hawk bullet if it helps:

Cartridge : .348 Win.
Bullet : .348, 270, Hawk FP
Useable Case Capaci: 59.320 grain H2O = 3.852 cm³
Cartridge O.A.L. L6: 2.795 inch = 70.99 mm
Barrel Length : 20.0 inch = 508.0 mm
Powder : Hodgdon H4895

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 67 36.80 1751 1838 25729 6427 91.4 1.651
-18.0 69 37.72 1791 1922 27177 6623 92.4 1.614
-16.0 71 38.64 1830 2008 28700 6816 93.3 1.579
-14.0 72 39.56 1870 2095 30301 7004 94.2 1.544
-12.0 74 40.48 1909 2184 31982 7187 95.0 1.511
-10.0 76 41.40 1948 2275 33749 7364 95.7 1.478
-08.0 77 42.32 1987 2367 35604 7536 96.4 1.447
-06.0 79 43.24 2026 2460 37552 7702 97.1 1.416
-04.0 81 44.16 2064 2555 39597 7860 97.6 1.380 ! Near Maximum !
-02.0 82 45.08 2103 2651 41745 8012 98.1 1.346 ! Near Maximum !
+00.0 84 46.00 2141 2748 44000 8156 98.6 1.313 ! Near Maximum !
+02.0 86 46.92 2179 2846 46368 8292 99.0 1.281 !DANGEROUS LOAD-DO NOT USE!
+04.0 87 47.84 2217 2946 48855 8420 99.3 1.250 !DANGEROUS LOAD-DO NOT USE!
+06.0 89 48.76 2254 3046 51468 8540 99.5 1.220 !DANGEROUS LOAD-DO NOT USE!
+08.0 91 49.68 2291 3148 54213 8651 99.7 1.192 !DANGEROUS LOAD-DO NOT USE!
+10.0 93 50.60 2328 3250 57100 8753 99.9 1.164 !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 84 46.00 2231 2985 51736 7974 100.0 1.223 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 84 46.00 2018 2442 36458 7959 93.3 1.429

M1,
That data seems to be alot faster than what I'm getting in my rifle with these bullets. I can provide my COAL, bullet length, etc if you can build a custom template in QL. Getting a BC might be a problem though.

Thanks, Dinny

I can punch it in. You can adjust the burn rate to velocity but it is a different bullet, maybe with different jacket metallurgy so I can't say how accurate it may be adjusting it to the Hawk but at least give you something to work with.

My bullets are 1.201" long and my COAL is 2.765".

Thanks, Dinny

Adjusted for your velocity and OAL. Your bullet is not the Hawk and I don't think I'd trust the data and take it with a huge grain of salt. FYI the max for all 250s shows about 48 grns (47 by Barnes data).


Cartridge : .348 Win.
Bullet : .348, 270, Hawk FP
Useable Case Capaci: 58.378 grain H2O = 3.790 cm³
Cartridge O.A.L. L6: 2.765 inch = 70.23 mm
Barrel Length : 20.0 inch = 508.0 mm
Powder : Hodgdon H4895 ?

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 70 37.60 1649 1631 22048 6005 82.4 1.778
-18.0 72 38.54 1689 1710 23323 6221 83.6 1.735
-16.0 73 39.48 1728 1791 24669 6436 84.8 1.694
-14.0 75 40.42 1768 1874 26075 6649 86.0 1.654
-12.0 77 41.36 1808 1959 27543 6861 87.1 1.615
-10.0 79 42.30 1847 2046 29077 7069 88.2 1.577
-08.0 80 43.24 1887 2136 30692 7275 89.3 1.540
-06.0 82 44.18 1927 2227 32396 7477 90.3 1.504
-04.0 84 45.12 1967 2320 34192 7676 91.2 1.469
-02.0 86 46.06 2007 2415 36087 7870 92.1 1.435
+00.0 87 47.00 2047 2513 38085 8060 93.0 1.399
+02.0 89 47.94 2087 2612 40192 8244 93.8 1.363 ! Near Maximum !
+04.0 91 48.88 2127 2713 42415 8422 94.6 1.329 ! Near Maximum !
+06.0 93 49.82 2167 2816 44761 8595 95.3 1.296 ! Near Maximum !
+08.0 94 50.76 2207 2921 47236 8761 96.0 1.264 !DANGEROUS LOAD-DO NOT USE!
+10.0 96 51.70 2247 3027 49850 8919 96.6 1.233 !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 87 47.00 2162 2802 45285 8267 98.1 1.294 ! Near Maximum !
Data for burning rate decreased by 10% relative to nominal value:
-Ba 87 47.00 1906 2178 31158 7514 84.7 1.518

That data is alot closer to what I experienced. The 40, 41, and 42gr loads I shot were real close to those values. I forgot to mention my barrel is 22" so that could account for some of the minute differences.

Thanks, Dinny

Adjusted for your barrel length:

Cartridge : .348 Win.
Bullet : .348, 270, Hawk FP
Useable Case Capaci: 58.600 grain H2O = 3.805 cm³
Cartridge O.A.L. L6: 2.765 inch = 70.23 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : Hodgdon H4895 ?

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 71 38.40 1683 1698 21615 5459 81.7 1.885
-18.0 73 39.36 1723 1781 22866 5656 83.0 1.840
-16.0 75 40.32 1764 1865 24188 5851 84.2 1.797
-14.0 76 41.28 1804 1952 25588 6046 85.4 1.754
-12.0 78 42.24 1845 2041 27067 6238 86.5 1.713
-10.0 80 43.20 1886 2132 28617 6428 87.6 1.673
-08.0 82 44.16 1927 2225 30239 6615 88.7 1.634
-06.0 84 45.12 1967 2321 31937 6800 89.7 1.595
-04.0 85 46.08 2008 2418 33728 6980 90.7 1.558
-02.0 87 47.04 2049 2518 35620 7157 91.6 1.522
+00.0 89 48.00 2090 2620 37619 7330 92.5 1.485
+02.0 91 48.96 2131 2723 39730 7497 93.3 1.448 ! Near Maximum !
+04.0 92 49.92 2172 2829 41961 7660 94.1 1.411 ! Near Maximum !
+06.0 94 50.88 2213 2937 44319 7817 94.9 1.376 ! Near Maximum !
+08.0 96 51.84 2254 3047 46812 7967 95.6 1.342 !DANGEROUS LOAD-DO NOT USE!
+10.0 98 52.80 2295 3158 49449 8112 96.2 1.309 !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 89 48.00 2209 2925 44842 7531 97.8 1.374 ! Near Maximum !
Data for burning rate decreased by 10% relative to nominal value:
-Ba 89 48.00 1945 2267 30667 6821 84.1 1.611

Wow! That puts me within 10fps of my chrono results.

Thanks, Dinny

I adjusted the burn rate of the powder to match your velocity.

I shot up to 46gr today and everything looks good. The group was just under 1" at 50yds and my velos were still within 10fps of what was last listed. Next I'll run it up in .5gr increments to 47.5gr.

Thanks, Dinny