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Rifles, Reloading, Optics, Equipment
Reloading
Absolute Hammer load data
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<blockquote data-quote="retumbo" data-source="post: 2049577" data-attributes="member: 116543"><p>Working up a load with the 28 Nosler and 140gr AH and thought I'd share some results from a pressure test ladder. Had IMR4955, IMR7977, and Retumbo on hand to cover a broad spectrum of burn rates to see what might work with this combo.</p><p></p><p>Christensen Arms Ridgeline</p><p>26" 1-9" Twist</p><p>New ADG Brass</p><p>Federal 215M</p><p>1/8 Turn Crimp with Lee Factory Crimp Die</p><p>COAL 3.403" (0.020" jump)</p><p>Velocity at 15'</p><p></p><p>IMR4955</p><p>Chronograph wasn't working this day, some idiot didn't check to make sure the battery was still good [me].</p><p>Sunny 65F</p><p>75.0gr</p><p>76.0gr</p><p>77.0gr</p><p>78.0gr Faint ejector mark</p><p>79.0gr Ejector mark, bolt lift</p><p>Stopped at 79.0gr. Tons of case capacity left and was already hitting high pressure.</p><p></p><p>IMR7977</p><p>Sunny 29F</p><p>82.0gr 3358</p><p>83.0gr 3367</p><p>84.0gr 3472</p><p>85.0gr 3527</p><p>86.0gr 3565 faint ejector mark</p><p>87.0gr 3584 ejector mark</p><p>88.0gr 3652 ejector mark, bolt lift</p><p>Not excited about the non-correlated progression of velocity related to charge weight. I've had good luck with IMR7977 with other combos but I don't think this is a good fit here. Maybe H1000 would be more consistent and slightly faster, but I don't have any on hand. 7 shot group was under 1" at 100 yards.</p><p></p><p>Retumbo</p><p>Sunny 29F</p><p>86.0gr 3472</p><p>87.0gr 3546</p><p>88.0gr 3574</p><p>89.0gr 3613 faint ejector mark</p><p>90.0gr 3642 ejector mark</p><p>91.0gr 3693 ejector mark, bolt lift</p><p>92.0gr 3724 ejector mark, bolt lift, leaking around perimeter of primer [too hot for sure]</p><p>Going to accuracy test 88.5gr. 7 shot group was under 1" at 100 yards.</p><p></p><p>I want to try N570 but who knows when I'll be able to find it.</p><p></p><p>I haven't tested the 143gr HH in 28N yet, but I understand that folks are getting around 3600fps with similar charge weights. After viewing all the data I can find, and from my own limited testing, I'm starting to conclude that the AH's have minimal velocity advantage over the HH's in big overbore cartridges like the 28N. Anyone else coming to this conclusion?</p></blockquote><p></p>
[QUOTE="retumbo, post: 2049577, member: 116543"] Working up a load with the 28 Nosler and 140gr AH and thought I'd share some results from a pressure test ladder. Had IMR4955, IMR7977, and Retumbo on hand to cover a broad spectrum of burn rates to see what might work with this combo. Christensen Arms Ridgeline 26" 1-9" Twist New ADG Brass Federal 215M 1/8 Turn Crimp with Lee Factory Crimp Die COAL 3.403" (0.020" jump) Velocity at 15' IMR4955 Chronograph wasn't working this day, some idiot didn't check to make sure the battery was still good [me]. Sunny 65F 75.0gr 76.0gr 77.0gr 78.0gr Faint ejector mark 79.0gr Ejector mark, bolt lift Stopped at 79.0gr. Tons of case capacity left and was already hitting high pressure. IMR7977 Sunny 29F 82.0gr 3358 83.0gr 3367 84.0gr 3472 85.0gr 3527 86.0gr 3565 faint ejector mark 87.0gr 3584 ejector mark 88.0gr 3652 ejector mark, bolt lift Not excited about the non-correlated progression of velocity related to charge weight. I've had good luck with IMR7977 with other combos but I don't think this is a good fit here. Maybe H1000 would be more consistent and slightly faster, but I don't have any on hand. 7 shot group was under 1" at 100 yards. Retumbo Sunny 29F 86.0gr 3472 87.0gr 3546 88.0gr 3574 89.0gr 3613 faint ejector mark 90.0gr 3642 ejector mark 91.0gr 3693 ejector mark, bolt lift 92.0gr 3724 ejector mark, bolt lift, leaking around perimeter of primer [too hot for sure] Going to accuracy test 88.5gr. 7 shot group was under 1" at 100 yards. I want to try N570 but who knows when I'll be able to find it. I haven't tested the 143gr HH in 28N yet, but I understand that folks are getting around 3600fps with similar charge weights. After viewing all the data I can find, and from my own limited testing, I'm starting to conclude that the AH's have minimal velocity advantage over the HH's in big overbore cartridges like the 28N. Anyone else coming to this conclusion? [/QUOTE]
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