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Long Range Hunting & Shooting
Pressure question on 300 WSM
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<blockquote data-quote="tim_w" data-source="post: 2651254" data-attributes="member: 11132"><p>It's why I suggested to go with hrdy COAL to start with and adj from there given your erratic pressure issues. That will be sure to get you off the lands. After you can spend the time and workout what is just touching and from that you'll know your actual jump. You can adjust by moving 0.003 in either direction to see its effect on your groups once you have powder load node figured.</p><p></p><p>You really should take [USER=85874]@sedancowboy[/USER] up on his offer to drill and tap a fire case for you to use for checking bto to lands comparator. It's by far the most accurate way.</p><p></p><p>As a general rule of thumb you don't want to be in the ±0.005 the lands range. It is a range where wildly inconsistent pressure can occur. Some loads may kiss the lands instead of having jump and others may not be into the lands when you want them to be and instead has jump causing a pressure drop. </p><p></p><p>Many loaders will stay at least .007 min off to be safe. As a new loader 0.010 min is best. You can easily move in and out of the tune by increasing jump to tune it. Especially true of eld, hybrids etc. Only some vld really show a real preference to be @ or into lands at times.</p></blockquote><p></p>
[QUOTE="tim_w, post: 2651254, member: 11132"] It's why I suggested to go with hrdy COAL to start with and adj from there given your erratic pressure issues. That will be sure to get you off the lands. After you can spend the time and workout what is just touching and from that you'll know your actual jump. You can adjust by moving 0.003 in either direction to see its effect on your groups once you have powder load node figured. You really should take [USER=85874]@sedancowboy[/USER] up on his offer to drill and tap a fire case for you to use for checking bto to lands comparator. It's by far the most accurate way. As a general rule of thumb you don't want to be in the ±0.005 the lands range. It is a range where wildly inconsistent pressure can occur. Some loads may kiss the lands instead of having jump and others may not be into the lands when you want them to be and instead has jump causing a pressure drop. Many loaders will stay at least .007 min off to be safe. As a new loader 0.010 min is best. You can easily move in and out of the tune by increasing jump to tune it. Especially true of eld, hybrids etc. Only some vld really show a real preference to be @ or into lands at times. [/QUOTE]
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Pressure question on 300 WSM
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