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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Absolute Hammer actual vs Quick-load
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<blockquote data-quote="Carey Farmer" data-source="post: 2617067" data-attributes="member: 122715"><p>I wouldn't shoot any more of those loads. If your muzzle velocity is 200 fps over QL prediction with QL chamber pressure at max, you are WAY over max chamber pressure.</p><p></p><p>Hammer Bullets website suggests that "Muzzle velocity should not exceed max load velocity listed for similar weight bullets listed in loading manual. Muzzle velocity is an indication of pressure." 2963 fps is VV's published max N550 load velocity for 150 gr thin-jacketed cup-and-core bullets.</p><p></p><p>VV load data has max N550 load of 54.3 gr for Barnes TTSX 150 gr. Even the more generous max N550 load for 150gr Hornady SST (thin-jacketed cup-and-core bullets, which typically don't build as much chamber pressure as mono's) is only 55.2 gr.</p><p></p><p>I shoot 155 gr Absolute Hammers in a 28 Nosler. The rifle has about 300 rounds through it, so has plenty of heat checking at the lands and therefore elevated start pressures. I get a QL match on 155 Absolute Hammer muzzle velocity with QL starting pressure set to 10,000 psi. Don't see any ejector print on Nosler brand brass case heads until QL predicted chamber pressure (with 10,000 psi start pressure) is up to about 70,000 psi. That's consistent with what I see with other bullets in Nosler brass, with QL "tuned" to that bullet's start pressure. I haven't been brave enough to try to get ejector prints on Lapua, ADG or Peterson brass.</p><p></p><p>Anyway, you should try plugging 10,000 psi start pressure in QL and see what you get for predicted muzzle velocity. If still low compared to measured velocity, increase QL start pressure as high as 15000 psi (that's what I typically have to use to get a match for Barnes bullets). Once you get a match with muzzle velocity, take a look at the estimated chamber pressure.</p></blockquote><p></p>
[QUOTE="Carey Farmer, post: 2617067, member: 122715"] I wouldn't shoot any more of those loads. If your muzzle velocity is 200 fps over QL prediction with QL chamber pressure at max, you are WAY over max chamber pressure. Hammer Bullets website suggests that "Muzzle velocity should not exceed max load velocity listed for similar weight bullets listed in loading manual. Muzzle velocity is an indication of pressure." 2963 fps is VV's published max N550 load velocity for 150 gr thin-jacketed cup-and-core bullets. VV load data has max N550 load of 54.3 gr for Barnes TTSX 150 gr. Even the more generous max N550 load for 150gr Hornady SST (thin-jacketed cup-and-core bullets, which typically don't build as much chamber pressure as mono's) is only 55.2 gr. I shoot 155 gr Absolute Hammers in a 28 Nosler. The rifle has about 300 rounds through it, so has plenty of heat checking at the lands and therefore elevated start pressures. I get a QL match on 155 Absolute Hammer muzzle velocity with QL starting pressure set to 10,000 psi. Don't see any ejector print on Nosler brand brass case heads until QL predicted chamber pressure (with 10,000 psi start pressure) is up to about 70,000 psi. That's consistent with what I see with other bullets in Nosler brass, with QL "tuned" to that bullet's start pressure. I haven't been brave enough to try to get ejector prints on Lapua, ADG or Peterson brass. Anyway, you should try plugging 10,000 psi start pressure in QL and see what you get for predicted muzzle velocity. If still low compared to measured velocity, increase QL start pressure as high as 15000 psi (that's what I typically have to use to get a match for Barnes bullets). Once you get a match with muzzle velocity, take a look at the estimated chamber pressure. [/QUOTE]
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Absolute Hammer actual vs Quick-load
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