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Rifles, Reloading, Optics, Equipment
Reloading
The first sign of excessive pressure is...
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<blockquote data-quote="MontanaRifleman" data-source="post: 286178" data-attributes="member: 11717"><p>Michael, I agree with you completely. My questions were mostly rhetorical. Yup, always start low and work up. Question in this thread is work up to what? Work up to predetermined velocities or work up to touchy-feely signs like bolt lift and brass stress signs?</p><p> </p><p>There is really no way to determine pressures without the proper equipment, so we all have our differnt techniques. I am like you... when I start to see and feel the signs I back off a little and consider that as my "max" working load.</p><p> </p><p>Recently I worked up some loads in my 300 WSM with RL17 and 168 TTSX's, 180 E-Tips and 210 Bergers. There was absolutley no data (that I could find) for this combination. I got some data from an article using other 165 and 180 bullets, so I proceded to load and fire incrementaly and consrvatively until I "saw and felt" signs. The results were very surprising to me with the TTSX's and E-Tips. I loaded the E-Tips to 68 gr and that is where I first started seeing pressure signs which is what I was expecting. My velociteis were good, about 3100 which was a little higher than I expected. I first started to see pressure signs at 66 gr with the TTSX's which surprised me. A slight stiff bolt. I fired a couple at 66.5 and the bolt was a little more stiff. I decided to try one at 66 (which maybe I shouldn't have) and the bolt was very stiff with some primer cratering. That night I went back and loaded some more E-Tips at 67.5 and 68. I loaded 5 at 67.5 gr at 2.95 COAL (max mag legnth) and 5 at 3.12 COAL (about .050 off the lands) I also loaded 5 at 68 gr at 3.12 oal because I want tot conduct a little experiment to see if seating the bullet farther out would decrease pressure by increasing case space. I fired the 67.5 loads and was completely surprised to see an almost 100 fps increas from the evening before. The ones seated deeper had an average velocity of 3193 which was about 7 fps faster than the ones seated farther out. I fired just two at 68 gr. They did seem to feel like a little less pressure then the one fired the night befrore but still a slight stiff bolt.</p><p> </p><p>Anyway the E-Tips which had a greater bearing surface and which were heavier allowed more powder and got higher velocities than the TTSX's. Go figure?</p><p> </p><p>Interestingly, the 210 Bergers maxed at 65.5 (same as the 168 TTSX's) with a velocity of 2935. However, the Bergers shot with 66 gr of powder only showed slightly crateres primers but no stiff bolt. Very interesting.</p><p> </p><p>Sorry for wandering <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p> </p><p>-MR</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 286178, member: 11717"] Michael, I agree with you completely. My questions were mostly rhetorical. Yup, always start low and work up. Question in this thread is work up to what? Work up to predetermined velocities or work up to touchy-feely signs like bolt lift and brass stress signs? There is really no way to determine pressures without the proper equipment, so we all have our differnt techniques. I am like you... when I start to see and feel the signs I back off a little and consider that as my "max" working load. Recently I worked up some loads in my 300 WSM with RL17 and 168 TTSX's, 180 E-Tips and 210 Bergers. There was absolutley no data (that I could find) for this combination. I got some data from an article using other 165 and 180 bullets, so I proceded to load and fire incrementaly and consrvatively until I "saw and felt" signs. The results were very surprising to me with the TTSX's and E-Tips. I loaded the E-Tips to 68 gr and that is where I first started seeing pressure signs which is what I was expecting. My velociteis were good, about 3100 which was a little higher than I expected. I first started to see pressure signs at 66 gr with the TTSX's which surprised me. A slight stiff bolt. I fired a couple at 66.5 and the bolt was a little more stiff. I decided to try one at 66 (which maybe I shouldn't have) and the bolt was very stiff with some primer cratering. That night I went back and loaded some more E-Tips at 67.5 and 68. I loaded 5 at 67.5 gr at 2.95 COAL (max mag legnth) and 5 at 3.12 COAL (about .050 off the lands) I also loaded 5 at 68 gr at 3.12 oal because I want tot conduct a little experiment to see if seating the bullet farther out would decrease pressure by increasing case space. I fired the 67.5 loads and was completely surprised to see an almost 100 fps increas from the evening before. The ones seated deeper had an average velocity of 3193 which was about 7 fps faster than the ones seated farther out. I fired just two at 68 gr. They did seem to feel like a little less pressure then the one fired the night befrore but still a slight stiff bolt. Anyway the E-Tips which had a greater bearing surface and which were heavier allowed more powder and got higher velocities than the TTSX's. Go figure? Interestingly, the 210 Bergers maxed at 65.5 (same as the 168 TTSX's) with a velocity of 2935. However, the Bergers shot with 66 gr of powder only showed slightly crateres primers but no stiff bolt. Very interesting. Sorry for wandering :rolleyes::D -MR [/QUOTE]
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The first sign of excessive pressure is...
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