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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Mega
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<blockquote data-quote="PapaSmurff" data-source="post: 2839921" data-attributes="member: 118512"><p>Ok, I have a fantastic update my friends. I was pressure/velocity testing with H4350 this afternoon when I had an idea: what if I changed over to large rifle primers instead of magnum rifle primers (I've read that this a lot of times helps lower the initial chamber pressures and therefore higher powder charges, yielding more velocity, and better ES is achieved). I'm posting a picture of my test of this using H4350 and 250 Bergers: the large magnum rifle primers are on the right and the large rifle primers are listed on the left side of the page in this picture. I couldn't go any higher because of pressure at 68.0 grains of H4350 using the magnum primers, BUT when I switched over Federal 210 Match primers I was then able to continue testing up to 71.0 grains without any stiff bolt lift (I probably could've went up one more grain to 72.0 before hard pressure signs). So then I decided to test the next powder (Reloder 19) with non-magnum primers this time. The results are incredible.. The velocities I got with RL-19 with both the 250 Berger and with the 270 ELD-X are much higher than I thought could be achieved without massive pressure. I'm posting 2 pictures below with these results from this afternoon. Starting accuracy testing development tomorrow afternoon using RL-19 (I used a 2 ft drop tube weigh RL-19.</p></blockquote><p></p>
[QUOTE="PapaSmurff, post: 2839921, member: 118512"] Ok, I have a fantastic update my friends. I was pressure/velocity testing with H4350 this afternoon when I had an idea: what if I changed over to large rifle primers instead of magnum rifle primers (I’ve read that this a lot of times helps lower the initial chamber pressures and therefore higher powder charges, yielding more velocity, and better ES is achieved). I’m posting a picture of my test of this using H4350 and 250 Bergers: the large magnum rifle primers are on the right and the large rifle primers are listed on the left side of the page in this picture. I couldn’t go any higher because of pressure at 68.0 grains of H4350 using the magnum primers, BUT when I switched over Federal 210 Match primers I was then able to continue testing up to 71.0 grains without any stiff bolt lift (I probably could’ve went up one more grain to 72.0 before hard pressure signs). So then I decided to test the next powder (Reloder 19) with non-magnum primers this time. The results are incredible.. The velocities I got with RL-19 with both the 250 Berger and with the 270 ELD-X are much higher than I thought could be achieved without massive pressure. I’m posting 2 pictures below with these results from this afternoon. Starting accuracy testing development tomorrow afternoon using RL-19 (I used a 2 ft drop tube weigh RL-19. [/QUOTE]
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