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Long Range Hunting & Shooting
Pressure question on 300 WSM
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<blockquote data-quote="lancetkenyon" data-source="post: 2650592" data-attributes="member: 68875"><p>First, use only ONE headstamp/brand of brass. Do NOT use both unless youbplan to work up two separate loads.</p><p></p><p>What brand brass does the book use that you got the info from? Different brass will have different case capacities. What is max in one might be overpressure in another, or below max is yet another. </p><p></p><p>What primers was the book using. Some are hotter than others.</p><p></p><p>What barrel length? Does book length differ from yours? Expect 25-30fps per 1" of barrel length change. Also, if yours is new, expect 60-120fps slower than the book velocities until it speeds up.</p><p></p><p>A lot of variables with bullet lots and powder lots too. I have seen same brand powders change 50-75fps between lots. Not usually, but it can happen. Bullets can change shapes between lots. Longer bearing surface = more friction = lower fps. </p><p></p><p>A loading data book recipe is a guide, not a Bible.</p></blockquote><p></p>
[QUOTE="lancetkenyon, post: 2650592, member: 68875"] First, use only ONE headstamp/brand of brass. Do NOT use both unless youbplan to work up two separate loads. What brand brass does the book use that you got the info from? Different brass will have different case capacities. What is max in one might be overpressure in another, or below max is yet another. What primers was the book using. Some are hotter than others. What barrel length? Does book length differ from yours? Expect 25-30fps per 1" of barrel length change. Also, if yours is new, expect 60-120fps slower than the book velocities until it speeds up. A lot of variables with bullet lots and powder lots too. I have seen same brand powders change 50-75fps between lots. Not usually, but it can happen. Bullets can change shapes between lots. Longer bearing surface = more friction = lower fps. A loading data book recipe is a guide, not a Bible. [/QUOTE]
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Pressure question on 300 WSM
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