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Rifles, Reloading, Optics, Equipment
Reloading
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<blockquote data-quote="Shootin4fun" data-source="post: 825572" data-attributes="member: 28741"><p>An old thread but I couldn't help but to comment on this because I see pressure signs in 2 guns, a 243 & 270 with loads well under max...With a 243Win...37 gr Varget behind a 85gr HPBT producing a very accurate load going out at 3040fps. Just what the book says it should be. 38gr is max and I load that with TSX 85gr because that was the most accurate, going out at 3200 fps. I get what Hogdon's manual says in terms of speed but I also get flattened primers in both cases (no pun intended)...no cratering, no sticky bolt. Same with a light load of Varget, 32.0 gr behind the 100gr Hdy Interlock producing only 2675 fps. Flattened primers only. To get more velocity in the 100 grainers I switched to IMR4831, and with that I get velocities higher than book for a given charge. With this I also get flattened primers well below book max but .actually tried a few at 1 gr over max to 43.9 gr giving 3120 fps. Now that seems fast for a 243 and 100 gr bullet and I know there's no free lunch. But still only flattened primers. </p><p></p><p>In a 270 BAR, I get flattened primers with only 54.0 gr H4350 driving a 130gr TSX at 2900 fps. So when you guys are talking about pushing 130 gr bullets 3100+ I don't know how you get there. </p><p></p><p>Any ideas of why I get "premature" pressure signs? As you say boomtube, I'm reluctant to go much hotter despite being under max, OR drive them faster than expected (in the case of the 100 gr bullet) even though I'm not seeing much overpressure sign.</p></blockquote><p></p>
[QUOTE="Shootin4fun, post: 825572, member: 28741"] An old thread but I couldn't help but to comment on this because I see pressure signs in 2 guns, a 243 & 270 with loads well under max...With a 243Win...37 gr Varget behind a 85gr HPBT producing a very accurate load going out at 3040fps. Just what the book says it should be. 38gr is max and I load that with TSX 85gr because that was the most accurate, going out at 3200 fps. I get what Hogdon's manual says in terms of speed but I also get flattened primers in both cases (no pun intended)...no cratering, no sticky bolt. Same with a light load of Varget, 32.0 gr behind the 100gr Hdy Interlock producing only 2675 fps. Flattened primers only. To get more velocity in the 100 grainers I switched to IMR4831, and with that I get velocities higher than book for a given charge. With this I also get flattened primers well below book max but .actually tried a few at 1 gr over max to 43.9 gr giving 3120 fps. Now that seems fast for a 243 and 100 gr bullet and I know there's no free lunch. But still only flattened primers. In a 270 BAR, I get flattened primers with only 54.0 gr H4350 driving a 130gr TSX at 2900 fps. So when you guys are talking about pushing 130 gr bullets 3100+ I don't know how you get there. Any ideas of why I get "premature" pressure signs? As you say boomtube, I'm reluctant to go much hotter despite being under max, OR drive them faster than expected (in the case of the 100 gr bullet) even though I'm not seeing much overpressure sign. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
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