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Hunting
The Basics, Starting Out
powder for 7STW
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<blockquote data-quote="Austin" data-source="post: 52932" data-attributes="member: 1956"><p>Len: This bbl was the first I had made in a series for the 7mm/.338 Lapua. It's a gain twist ending in 1:12 and it is 34" in length. The bbl I am using on the action right now is 28" and is a 1:9" twist. I haven't chrono'd the 162 or 168's in the 9 twist yet, though i'm sure I won't see the velocities I did with the big bbl! Case capacity is 116.3grs H20. Measuring method was to weigh the brass dry, add water, weigh case full, empty water, weigh water, and then weigh case. Water level was filled to where the edges of the miniscus were level with the top of the case. The load I used was at the borderline pressure ceiling, but I have used up to 109.5grs. with the 162's. Never went that high with the 168's though. I posted some more info on the other forum where we were talking about this rifle. You may want to check them out. You still getting ready to build yourself one of these beasts? If you want to start from the "top down", this would be a good project for you! </p><p></p><p>TH</p></blockquote><p></p>
[QUOTE="Austin, post: 52932, member: 1956"] Len: This bbl was the first I had made in a series for the 7mm/.338 Lapua. It's a gain twist ending in 1:12 and it is 34" in length. The bbl I am using on the action right now is 28" and is a 1:9" twist. I haven't chrono'd the 162 or 168's in the 9 twist yet, though i'm sure I won't see the velocities I did with the big bbl! Case capacity is 116.3grs H20. Measuring method was to weigh the brass dry, add water, weigh case full, empty water, weigh water, and then weigh case. Water level was filled to where the edges of the miniscus were level with the top of the case. The load I used was at the borderline pressure ceiling, but I have used up to 109.5grs. with the 162's. Never went that high with the 168's though. I posted some more info on the other forum where we were talking about this rifle. You may want to check them out. You still getting ready to build yourself one of these beasts? If you want to start from the "top down", this would be a good project for you! TH [/QUOTE]
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powder for 7STW
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