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Rifles, Reloading, Optics, Equipment
Reloading
Verticle Spreading and load development help - where to go from here?
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<blockquote data-quote="vancewalker007" data-source="post: 2205629" data-attributes="member: 66917"><p>That's correct on fluctuating weight. Most scales only measure to a tenth of a grain so you might throw one and its 74.4999 then the next one might be 74.40, so loading in the middle of a velocity node gives you some cushion for that aspect. If its a cartridge that has data available like a 300 WM or a 30/06, I use may favorite recipe book and look up the max for the bullet powder combo. Then I build 10 rounds rolling back from the MAX .2 or .3 grains. Some folks like .5 but I like more resolution. So say the powder max is 78, my initial ladder might look like the following. </p><p></p><p>1 78.00</p><p>2 77.80</p><p>3 77.60</p><p>4 77.40</p><p>5 77.20</p><p>6 77.00</p><p>7 76.80</p><p>8 76.60</p><p>9 76.40</p><p>10 76.20</p><p></p><p>If you are using a wildcat, its harder and you need to be more careful about where you start. Nowadays you can use a loading program like Quickload to give you an estimated max load and work back. Before those were easily available we would use similar cartridges and start in the middle of the load range and slowly work up to find pressure and record velocity. I did this with my 2 old 7mm LRMs and back in the early 90s we did it with our 7mm STWs. For the LRM I used the 7mm Weatherby, started in the middle of its powder load and worked up. For the STWs we used the 300 Weatherby. We used to make STW brass from 300 Weatherby brass. You just have to avoid too light a load and too heavy then you can sneak up to the max.</p></blockquote><p></p>
[QUOTE="vancewalker007, post: 2205629, member: 66917"] That's correct on fluctuating weight. Most scales only measure to a tenth of a grain so you might throw one and its 74.4999 then the next one might be 74.40, so loading in the middle of a velocity node gives you some cushion for that aspect. If its a cartridge that has data available like a 300 WM or a 30/06, I use may favorite recipe book and look up the max for the bullet powder combo. Then I build 10 rounds rolling back from the MAX .2 or .3 grains. Some folks like .5 but I like more resolution. So say the powder max is 78, my initial ladder might look like the following. 1 78.00 2 77.80 3 77.60 4 77.40 5 77.20 6 77.00 7 76.80 8 76.60 9 76.40 10 76.20 If you are using a wildcat, its harder and you need to be more careful about where you start. Nowadays you can use a loading program like Quickload to give you an estimated max load and work back. Before those were easily available we would use similar cartridges and start in the middle of the load range and slowly work up to find pressure and record velocity. I did this with my 2 old 7mm LRMs and back in the early 90s we did it with our 7mm STWs. For the LRM I used the 7mm Weatherby, started in the middle of its powder load and worked up. For the STWs we used the 300 Weatherby. We used to make STW brass from 300 Weatherby brass. You just have to avoid too light a load and too heavy then you can sneak up to the max. [/QUOTE]
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Verticle Spreading and load development help - where to go from here?
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