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Rifles, Reloading, Optics, Equipment
Reloading
First Loads: Range Results
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<blockquote data-quote="rscott5028" data-source="post: 644426" data-attributes="member: 24624"><p>308 win, 22", 1:10 twist should be able to stabilize any bullet you can squeeze in the magazine. So, that's not going to cause any fliers with 178's. </p><p> </p><p>You don't have to know the exact measurement for jump/jam. But, it's good to know. You mostly need to keep track of relative measurements. After you find a suitable powder charge, you might want to try a few rounds at various seating depths. And, you'll want a comparator or micrometer die or something that helps you get back to your desired seating depth. </p><p> </p><p>Depending on how you plan to use the rifle, there's nothing wrong with FL sizing. But, good and consistent neck tension is important for consistent MV. Ideally, you want to be about .001-.002" below caliber with your neck ID after sizing. So, .306-.307" neck ID is about where you want to be. </p><p> </p><p>Neck tension is a function of the neck wall thickness vs your die. Bushing dies let you adjust neck tension. Neck wall thickness variation will affect concentricity (rather TIR) of the loaded bullet. </p><p> </p><p>If you FL size, you should verify that you're set to consistently bump the shoulder back about .003". Hornady or Sinclair type comparators will help you determine that. </p><p> </p><p>44.0gr is book max which is often conservative. It wouldn't hurt to load some at 44.3, 44.6, and 44.9. Just be prepared to stop and pull the bullets if you do see signs of pressure and be aware that some lot numbers of Varget will shoot hotter and your ammo will also have higher pressure in the heat of summer. So, you don't want to be on the edge. </p><p> </p><p>.2gr step sizes may almost be too small. Many scales are barely accurate to within .2 gr eventhough they read in tenths. </p><p> </p><p>-- richard</p></blockquote><p></p>
[QUOTE="rscott5028, post: 644426, member: 24624"] 308 win, 22", 1:10 twist should be able to stabilize any bullet you can squeeze in the magazine. So, that's not going to cause any fliers with 178's. You don't have to know the exact measurement for jump/jam. But, it's good to know. You mostly need to keep track of relative measurements. After you find a suitable powder charge, you might want to try a few rounds at various seating depths. And, you'll want a comparator or micrometer die or something that helps you get back to your desired seating depth. Depending on how you plan to use the rifle, there's nothing wrong with FL sizing. But, good and consistent neck tension is important for consistent MV. Ideally, you want to be about .001-.002" below caliber with your neck ID after sizing. So, .306-.307" neck ID is about where you want to be. Neck tension is a function of the neck wall thickness vs your die. Bushing dies let you adjust neck tension. Neck wall thickness variation will affect concentricity (rather TIR) of the loaded bullet. If you FL size, you should verify that you're set to consistently bump the shoulder back about .003". Hornady or Sinclair type comparators will help you determine that. 44.0gr is book max which is often conservative. It wouldn't hurt to load some at 44.3, 44.6, and 44.9. Just be prepared to stop and pull the bullets if you do see signs of pressure and be aware that some lot numbers of Varget will shoot hotter and your ammo will also have higher pressure in the heat of summer. So, you don't want to be on the edge. .2gr step sizes may almost be too small. Many scales are barely accurate to within .2 gr eventhough they read in tenths. -- richard [/QUOTE]
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First Loads: Range Results
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