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Tennessee Gun Owners Forums
Reloading
Interesting pressure situation
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<blockquote data-quote="Tenntrapper" data-source="post: 5892330" data-attributes="member: 18110"><p>Loading the 150g Nosler CTBST, using H380 powder. All the data I can find says...41.5g min to 45.5g max.</p><p>I started at 43g. Only sign of pressure was a little mark on the brass (ejector mark) I guess that's what you would call it, it's a Mauser action and the mark was from where a cut is in the bolt face. Anyway, surely not hitting pressure this low, so...I proceed. At 44.5, I stop. Nothing has changed, no other marks on brass or otherwise signs of over pressure. The original mark hasn't gotten worse.... stayed the same. At this point, I'm not shooting groups, was just doing ladder test... checking for pressure. I did load up a bunch for testing, but hadn't gotten around to shooting them yet.</p><p></p><p>That was the other day. Yesterday, I talked to Jerry about something else. Oh yeah...can you check something else for me? Feeling 100 percent confident that the data was correct...it came from Nosler, and was verified through a couple other sources...but that little mark was in the back of my mind.</p><p></p><p>He already had my data in his computer, and as soon as I told him 44.5g, he said...that's too much. It was so quick, I got the impression he hadn't even had time to plug that combo in. 68k psi....I was way over (61k max), and wasn't even to book Max? </p><p>Everything else I've tried in this rifle has gone smoothly....all the way to max without pressure. Generous chamber, generous throat, etc. Ended up having to go back to 41.3 to be under pressure and at a predicted node. So, what's the deal with this powder? And how was i so far over pressure and only getting a very faint little mark? Primers fine, etc.</p><p>My question about "this powder" pertains to hitting pressure well before book Max...from several books. What about people loading this load without help from Jerry and all his experience, testing equipment, etc?</p><p>Something just seems off.</p></blockquote><p></p>
[QUOTE="Tenntrapper, post: 5892330, member: 18110"] Loading the 150g Nosler CTBST, using H380 powder. All the data I can find says...41.5g min to 45.5g max. I started at 43g. Only sign of pressure was a little mark on the brass (ejector mark) I guess that's what you would call it, it's a Mauser action and the mark was from where a cut is in the bolt face. Anyway, surely not hitting pressure this low, so...I proceed. At 44.5, I stop. Nothing has changed, no other marks on brass or otherwise signs of over pressure. The original mark hasn't gotten worse.... stayed the same. At this point, I'm not shooting groups, was just doing ladder test... checking for pressure. I did load up a bunch for testing, but hadn't gotten around to shooting them yet. That was the other day. Yesterday, I talked to Jerry about something else. Oh yeah...can you check something else for me? Feeling 100 percent confident that the data was correct...it came from Nosler, and was verified through a couple other sources...but that little mark was in the back of my mind. He already had my data in his computer, and as soon as I told him 44.5g, he said...that's too much. It was so quick, I got the impression he hadn't even had time to plug that combo in. 68k psi....I was way over (61k max), and wasn't even to book Max? Everything else I've tried in this rifle has gone smoothly....all the way to max without pressure. Generous chamber, generous throat, etc. Ended up having to go back to 41.3 to be under pressure and at a predicted node. So, what's the deal with this powder? And how was i so far over pressure and only getting a very faint little mark? Primers fine, etc. My question about "this powder" pertains to hitting pressure well before book Max...from several books. What about people loading this load without help from Jerry and all his experience, testing equipment, etc? Something just seems off. [/QUOTE]
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Reloading
Interesting pressure situation
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