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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="choprzrul" data-source="post: 2617514" data-attributes="member: 121411"><p>In my (limited) experience using QL and then shooting load ladders to find pressure.....I see pressure signs starting at about 1.5% to 2% below what QL says is max pressure.</p><p></p><p>Example, if QL says cartridge X using 50.0gr of powder P under Hammer bullet H gives me 61,999psi (1 psi below SAAMI spec for X), I would expect to find pressure starting at 49.0gr at the range.</p><p></p><p>Thursday I was testing a Savage Lightweight model 11 in 6.5CM using 85gr Hammer Hunters. Nosler brass, WLR primers, W748, 2.603" OAL. QL says 45.5gr should give me 62,737psi against a spec of 63,091psi max. One more tenth of powder and QL says it will be over the max psi. I should have known better, but I started my ladder at 44.0gr just for sighters and cleaning rounds. Here is the results of my range day last Thursday:</p><p></p><p>44.0gr 3 shots, 3402fps average. 0.49" group. 24.83 SD</p><p>44.5gr 3 shots, 3413fps average. 0.88" group. 7.57 SD. Slightly sticky bolt, hard to extract</p><p>45.0gr 1 shot, 3433fps. Blew the primer! 0.004" head growth! Bolt hard to lift. Very difficult to extract.</p><p></p><p>So, right on time, the pressure signs started at 2% under what QL said was max. I've been noticing, in my very limited experiences with QL and Hammers, that the 2% seems to be a good point of reference for max load......and then start reduced well below that number. The general rule of thumb to reduce 10% and work your way up seems to be good advice IMHO.</p></blockquote><p></p>
[QUOTE="choprzrul, post: 2617514, member: 121411"] In my (limited) experience using QL and then shooting load ladders to find pressure.....I see pressure signs starting at about 1.5% to 2% below what QL says is max pressure. Example, if QL says cartridge X using 50.0gr of powder P under Hammer bullet H gives me 61,999psi (1 psi below SAAMI spec for X), I would expect to find pressure starting at 49.0gr at the range. Thursday I was testing a Savage Lightweight model 11 in 6.5CM using 85gr Hammer Hunters. Nosler brass, WLR primers, W748, 2.603" OAL. QL says 45.5gr should give me 62,737psi against a spec of 63,091psi max. One more tenth of powder and QL says it will be over the max psi. I should have known better, but I started my ladder at 44.0gr just for sighters and cleaning rounds. Here is the results of my range day last Thursday: 44.0gr 3 shots, 3402fps average. 0.49" group. 24.83 SD 44.5gr 3 shots, 3413fps average. 0.88" group. 7.57 SD. Slightly sticky bolt, hard to extract 45.0gr 1 shot, 3433fps. Blew the primer! 0.004" head growth! Bolt hard to lift. Very difficult to extract. So, right on time, the pressure signs started at 2% under what QL said was max. I've been noticing, in my very limited experiences with QL and Hammers, that the 2% seems to be a good point of reference for max load......and then start reduced well below that number. The general rule of thumb to reduce 10% and work your way up seems to be good advice IMHO. [/QUOTE]
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Absolute Hammer actual vs Quick-load
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