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Posted: 11/22/2009 1:40:11 PM EDT
| can't find any data in my books on the Hornady 75gn bthp so I'm looking at a loading for 75 gn A-max. I was thinking of loading with 24.5 grains of winchester 748 but I'm not sure if the pressure will be too high or not (shooting out of one of my AR's). Anyone have any advice/suggestions? |
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Quoted:
Quoted:
The hornady loading manual page scan that I have shows the 75 grain max load of win 748 to be 24.0 grains. The page is a couple years old so it may be different now. This is the current max load for this bullet according to the Hornady 7th edition. thanks guys, guess I need to add that book to my bookshelf |
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Couple hints from the Hodgdon powder website:
50 GR. SPR SP Winchester 748 .224" 2.210" 26.0 3200 40,000 CUP 53 GR. SIE HP Winchester 748 .224" 2.200" 26.0 3200 43,500 CUP 55 GR. SPR SP Winchester 748 .224" 2.200" 26.3 3150 39,000 CUP 63 GR. SIE SP Winchester 748 .224" 2.200" 25.0 2970 47,500 CUP 69 GR. SIE HPBT Winchester 748 .224" 2.235" 24.5 2870 51,500 CUP 75 GR. JLK VLD IMR IMR 4007 SSC .224" 2.250" 23.0 2463 39,400 PSI 26.0C 2780 52,300 PSI 75 GR. JLK VLD Hodgdon Varget .224" 2.250" 22.5 2693 40,600 CUP 25.0 2907 48,400 CUP 75 GR. JLK VLD IMR IMR 4320 .224" 2.250" 22.5 2554 39,700 PSI 24.2C 2766 53,200 PSI 75 GR. JLK VLD IMR IMR 4064 .224" 2.250" 21.0 2531 37,500 PSI 24.0C 2827 53,400 PSI 75 GR. JLK VLD Hodgdon BL-C(2) .224" 2.250" 23.0 2646 39,800 CUP 26.0 2858 49,500 CUP 75 GR. JLK VLD IMR IMR 4895 .224" 2.250" 21.2 2506 41,200 PSI 23.8C 2786 51,800 PSI 75 GR. JLK VLD Hodgdon H335 .224" 2.250" 21.0 2624 41,300 CUP 23.0 2814 50,000 CUP 75 GR. JLK VLD Hodgdon H4895 .224" 2.250" 22.5 2696 39,900 CUP 24.5 2905 50,000 CUP 75 GR. JLK VLD IMR IMR 8208 XBR .224" 2.250" 20.0 2538 40,800 PSI 22.7 2804 53,900 PSI 75 GR. JLK VLD IMR IMR 3031 .224" 2.250" 20.0 2543 40,000 PSI 21.8C 2740 53,500 PSI 75 GR. JLK VLD Hodgdon Benchmark .224" 2.250" 21.5 2610 41,900 CUP 23.5 2829 49,400 CUP 75 GR. JLK VLD Hodgdon H322 .224" 2.250" 20.0 2594 40,700 CUP 22.0 2785 48,100 CUP Link |
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Quoted:
They don't list data with the 75 grain and WW748. I think they do that sometimes because they want to persuade people to use Hodgdon powder when they can. Your suggested load is the max load listed for a 69 grainer, so you probably want to start with less.  WInchester powder is Hodgdon powder. I think Win, IMR and Hodgdon are all marketed by Hodgdon now. |
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Heavy weight .224 bullets usually prefer stick powders, the only exception I'm aware of is AA-2520 which some have reported excellent velocity and accuracy.
Hornady's latest manual does show 24.0 grains even as a maximum load. Velocity is listed at 2700 fps from their 20" barrel if you have a chronograph. My picks for powder, based on what I've tried and others are using in NRA highpower tournaments is; Reloder-15 - 24.0 grains max. Varget - 23.5 grains max. VihtaVuori NN-140 - 23.5 grains max. VihtaVuori N-540 23.7 grains max. H-4895 - 23.0 grains max. AA-2520 - 22.5 grains max. Whatever you do don't start at these or any other company's data that shows max. At least work up from one grain below this +/- depending on Zodiac reading for the day. 
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