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Rifles, Reloading, Optics, Equipment
Reloading
Question regarding OCW
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<blockquote data-quote="RickInFL" data-source="post: 1167895" data-attributes="member: 70399"><p>From Dan Newberry's OCW instructions...</p><p></p><p>"3. Consult at least three load data sources for maximum charge weight for the powder you've selected. Powder manufacturers are the most reliable source. You must then decide on what your maximum charge will be.</p><p></p><p>4. Back away from the maximum charge by 7 to 10 percent, and load one test round with this charge. Add 2% to the charge weight, and load another cartridge with that charge. Load a third test cartridge with the next 2% graduation. You will use these three cartridges for sighters, and more importantly to determine pressure tolerance in your individual rifle.</p><p></p><p>5. Add another 2% or so to the charge level used in cartridge #3 of step 4, and load three rounds with this charge weight. Add .7% to 1% to this charge, and load three more. Add that same graduation again, and load three more. Continue adding the chosen graduation until you have moved ONE increment above your chosen maximum powder charge."</p><p></p><p>I'm loading .308 168gr HPBT and IMR4064 with Lapua brass</p><p></p><p>Based on Dan Newbery's figures I'll be starting my .308 OCW loads at 42.5 grains of powder, which is 2.0 grs above the Nosler manual which suggest a starting load of 40.5 grains and a max load of 44.5 grains. Am I calculating this correctly in that using the OCW charge weight recommendations that I'll not load the first 2 grains from Nosler's min charge weight? </p><p></p><p>Also do I need to deduct .4% from the published data for the Lapua brass? </p><p></p><p>Thanks.</p></blockquote><p></p>
[QUOTE="RickInFL, post: 1167895, member: 70399"] From Dan Newberry's OCW instructions... "3. Consult at least three load data sources for maximum charge weight for the powder you've selected. Powder manufacturers are the most reliable source. You must then decide on what your maximum charge will be. 4. Back away from the maximum charge by 7 to 10 percent, and load one test round with this charge. Add 2% to the charge weight, and load another cartridge with that charge. Load a third test cartridge with the next 2% graduation. You will use these three cartridges for sighters, and more importantly to determine pressure tolerance in your individual rifle. 5. Add another 2% or so to the charge level used in cartridge #3 of step 4, and load three rounds with this charge weight. Add .7% to 1% to this charge, and load three more. Add that same graduation again, and load three more. Continue adding the chosen graduation until you have moved ONE increment above your chosen maximum powder charge." I'm loading .308 168gr HPBT and IMR4064 with Lapua brass Based on Dan Newbery's figures I'll be starting my .308 OCW loads at 42.5 grains of powder, which is 2.0 grs above the Nosler manual which suggest a starting load of 40.5 grains and a max load of 44.5 grains. Am I calculating this correctly in that using the OCW charge weight recommendations that I'll not load the first 2 grains from Nosler's min charge weight? Also do I need to deduct .4% from the published data for the Lapua brass? Thanks. [/QUOTE]
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Question regarding OCW
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