Quick load request; 375 H&H

[salmonchaser]

Looking for Vihtivori 555 300 gr. Swift A Frame; 24 inch ruger #1.
My rifle has a pretty long throat lets go with 3.60 coal.
Thanks in advance.

 

[DrMike]

Cartridge          : .375 H.& H. Mag.
Bullet             : .375, 300, Swift A-Frame SS
Useable Case Capaci: 80.509 grain H2O = 5.227 cm³
Cartridge O.A.L. L6: 3.600 inch = 91.44 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Vihtavuori N555 *C*T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   95    69.03   2368    3736   46778   8265     99.0    1.326
-09.0   96    69.80   2392    3812   48053   8334     99.1    1.312
-08.0   97    70.56   2416    3888   49366   8400     99.3    1.298
-07.0   98    71.33   2440    3964   50718   8463     99.5    1.284
-06.0   99    72.10   2463    4042   52112   8523     99.6    1.271
-05.0  100    72.87   2487    4119   53547   8580     99.7    1.257  ! Near Maximum !
-04.0  101    73.63   2510    4198   55027   8633     99.8    1.244  ! Near Maximum !
-03.0  102    74.40   2534    4277   56552   8683     99.9    1.231  ! Near Maximum !
-02.0  103    75.17   2557    4356   58125   8729    100.0    1.218  ! Near Maximum !
-01.0  104    75.93   2581    4436   59747   8772    100.0    1.205  ! Near Maximum !
+00.0  105    76.70   2604    4517   61421   8811    100.0    1.192  ! Near Maximum !
+01.0  106    77.47   2627    4598   63149   8847    100.0    1.179  !DANGEROUS LOAD-DO NOT USE!
+02.0  108    78.23   2651    4680   64937   8883    100.0    1.166  !DANGEROUS LOAD-DO NOT USE!
+03.0  109    79.00   2674    4762   66791   8918    100.0    1.154  !DANGEROUS LOAD-DO NOT USE!
+04.0  110    79.77   2697    4845   68715   8952    100.0    1.141  !DANGEROUS LOAD-DO NOT USE!
+05.0  111    80.54   2720    4928   70710   8985    100.0    1.129  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    105    76.70   2660    4712   67301   8582    100.0    1.157  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    105    76.70   2536    4283   55383   8986     99.3    1.231  ! Near Maximum !

 

[salmonchaser]

Cartridge          : .375 H.& H. Mag.
Bullet             : .375, 300, Swift A-Frame SS
Useable Case Capaci: 80.509 grain H2O = 5.227 cm³
Cartridge O.A.L. L6: 3.600 inch = 91.44 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Vihtavuori N555 *C*T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   95    69.03   2368    3736   46778   8265     99.0    1.326
-09.0   96    69.80   2392    3812   48053   8334     99.1    1.312
-08.0   97    70.56   2416    3888   49366   8400     99.3    1.298
-07.0   98    71.33   2440    3964   50718   8463     99.5    1.284
-06.0   99    72.10   2463    4042   52112   8523     99.6    1.271
-05.0  100    72.87   2487    4119   53547   8580     99.7    1.257  ! Near Maximum !
-04.0  101    73.63   2510    4198   55027   8633     99.8    1.244  ! Near Maximum !
-03.0  102    74.40   2534    4277   56552   8683     99.9    1.231  ! Near Maximum !
-02.0  103    75.17   2557    4356   58125   8729    100.0    1.218  ! Near Maximum !
-01.0  104    75.93   2581    4436   59747   8772    100.0    1.205  ! Near Maximum !
+00.0  105    76.70   2604    4517   61421   8811    100.0    1.192  ! Near Maximum !
+01.0  106    77.47   2627    4598   63149   8847    100.0    1.179  !DANGEROUS LOAD-DO NOT USE!
+02.0  108    78.23   2651    4680   64937   8883    100.0    1.166  !DANGEROUS LOAD-DO NOT USE!
+03.0  109    79.00   2674    4762   66791   8918    100.0    1.154  !DANGEROUS LOAD-DO NOT USE!
+04.0  110    79.77   2697    4845   68715   8952    100.0    1.141  !DANGEROUS LOAD-DO NOT USE!
+05.0  111    80.54   2720    4928   70710   8985    100.0    1.129  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    105    76.70   2660    4712   67301   8582    100.0    1.157  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    105    76.70   2536    4283   55383   8986     99.3    1.231  ! Near Maximum !

Thank you Dr. Mike.

 

[JD338]

Solid speeds for the 375 and the Swift A Frame.

JD338

 

[salmonchaser]

I asked my PH if he had any issue with me using my 375#1 for Cape Buffalo. He wants me to practice reloading speed and to use swift A frames. I have a good load with RL 15 and Nosler’s but I only have 1/2 pound of powder left. The Vihtivori powders get good speed. At the moment I can’t find any 300 gr. Swift A Frames.

 

[JD338]

Don
I’ve been looking for 300 gr AFrames myself and they are nonexistent. North Fork and Trophy Bonded Bear Claws are also unavailable.
Barnes TSX isn’t a bad choice and they’re available.

JD338

 

[RL338]

It took 85grs of N555 to break 2600fps behind the Hornady 300gr BTSP in my 375 Wby. N555 seams a little bulky and a slow burner in that case.

 

[salmonchaser]

It took 85grs of N555 to break 2600fps behind the Hornady 300gr BTSP in my 375 Wby. N555 seams a little bulky and a slow burner in that case.

Good intel, thanks I saw Vihtivori showed it for the Barnes tsx but not the Swift. Have you used 540?

 

[salmonchaser]

Don
I’ve been looking for 300 gr AFrames myself and they are nonexistent. North Fork and Trophy Bonded Bear Claws are also unavailable.
Barnes TSX isn’t a bad choice and they’re available.

JD338

300 gr tsx is second choice with my PH, partitions third. I’ve 50 weeks to get it figured out I have tsx on the way and I’m shooting some Partitions and Accubonds tomorrow.

 

[RL338]

Good intel, thanks I saw Vihtivori showed it for the Barnes tsx but not the Swift. Have you used 540?

I have not tried 540. Most powders I use are around the RL-17. I know JD has had good luck with Sta-BALL 6.5 in his 375. Hodgdon list it at the top with the 300gr Swift.

 

[JD338]

Staball 6.5 would be my starting point with the 300 gr loads.

JD338

 

[salmonchaser]

Shoot I think I have some 6.5 in the back, down on the bottom of the cabinet. I’ll give it a whirl next week.

 

[salmonchaser]

Cartridge          : .375 H.& H. Mag.
Bullet             : .375, 300, Swift A-Frame SS
Useable Case Capaci: 80.509 grain H2O = 5.227 cm³
Cartridge O.A.L. L6: 3.600 inch = 91.44 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Vihtavuori N555 *C*T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   95    69.03   2368    3736   46778   8265     99.0    1.326
-09.0   96    69.80   2392    3812   48053   8334     99.1    1.312
-08.0   97    70.56   2416    3888   49366   8400     99.3    1.298
-07.0   98    71.33   2440    3964   50718   8463     99.5    1.284
-06.0   99    72.10   2463    4042   52112   8523     99.6    1.271
-05.0  100    72.87   2487    4119   53547   8580     99.7    1.257  ! Near Maximum !
-04.0  101    73.63   2510    4198   55027   8633     99.8    1.244  ! Near Maximum !
-03.0  102    74.40   2534    4277   56552   8683     99.9    1.231  ! Near Maximum !
-02.0  103    75.17   2557    4356   58125   8729    100.0    1.218  ! Near Maximum !
-01.0  104    75.93   2581    4436   59747   8772    100.0    1.205  ! Near Maximum !
+00.0  105    76.70   2604    4517   61421   8811    100.0    1.192  ! Near Maximum !
+01.0  106    77.47   2627    4598   63149   8847    100.0    1.179  !DANGEROUS LOAD-DO NOT USE!
+02.0  108    78.23   2651    4680   64937   8883    100.0    1.166  !DANGEROUS LOAD-DO NOT USE!
+03.0  109    79.00   2674    4762   66791   8918    100.0    1.154  !DANGEROUS LOAD-DO NOT USE!
+04.0  110    79.77   2697    4845   68715   8952    100.0    1.141  !DANGEROUS LOAD-DO NOT USE!
+05.0  111    80.54   2720    4928   70710   8985    100.0    1.129  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    105    76.70   2660    4712   67301   8582    100.0    1.157  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    105    76.70   2536    4283   55383   8986     99.3    1.231  ! Near Maximum !

 

[salmonchaser]

Whoops some how I copied that forward.

 

[salmonchaser]

Took some 300 gr partitions to the range loaded with 68 gr RL 15, Replaced the old 1.5 x4 vx11 with a not so old vx3 1.5x5 I had on a Ruger 10/22. Took a couple of shots to get it a little closer then got serious, Point of aim was the lower target in the picture. First two went high. Took a few clicks got the second two pretty close. 3 or 4 more clicks, I’m done with zero. I just wish my PH loved Partitions.
With a velocity of 2480 I’m less than 1/2 inch high at 50, dead zero at 100; 1 MOA at 150; 2.5 moa at 200; touch over 4 MOA at 250 and right at 6 MOA at 300. I hung a sheet of butcher paper at 300 yards and put a bulls eye target right at the top. Fired two shots, both landed about 18 inches below the target using the 100 yard zero. May not be prairie dog accurate but certainly Kudu accurate. Wouldn’t shoot at a Cape Buffalo that far away.
I thought about taking some 260s with me for the ever present Kudu in the area we will be hunting. Decided not to do that as the 260s print 6 inches higher running 2780fps. The scope on there now does not have cds. Think I’ll put it back on the 22 and order up a vx3hd cds. If I need to shoot 300 I’ll just crank her up.

 

[Guy Miner]

Good shooting! I haven't seen any RL-15 in a long doggone time. However I've found that Varget works really well instead. And of course there's always good ol' H4350 which can shove a 300 gr bullet at 2500+ fps just fine.

Guy

 

[salmonchaser]

I've plenty of H4350 and just about done with 15. There is a can at my local gun store but I won't pay 85.00 us.
I fired right at 1000 rounds with my 300 getting ready for my recent hunt, 5% of those off the bench. I'm not sure I'll pull the trigger that many times with the 375