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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 RUM+180g btip+Retumbo
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<blockquote data-quote="sambo3006" data-source="post: 99227" data-attributes="member: 2740"><p>As some of the others have stated, dimensional differences in each rifle can make a difference on max load, but also not all 180 gr bullets (or any other for that matter) are created equal. The length of bearing surface makes a big difference in pressure. I stupidly loaded up 1 gr under what was listed as max with Retumbo for a 225gr bullet behind the 230 gr 338 failsafe in my 338RUM. Sticky bolt and ejector mark on case head! Dropped 3 grains, bolt opens smooth but still ejector mark on case head. When I thought about it, the Failsafe is a flat base bullet with a long bearing surface.</p><p></p><p>The other guys are right. There is no such thing as a free lunch. The only way to generate more velocity at a given pressure (besides barrel length) is to have a load that reaches the top of the pressure curve faster and remains there longer--more area under the curve.</p><p></p><p>I know we all want to maximize velocity in our rounds, but gosh, these rounds are impressive enough without pushing the pressure limits. 3300 fps with a 180 gr 30 cal bullet is pretty awesome. Kirby's rounds really push the performance limits, but they have a huge powder capacity to reach those velocities with safe pressure.</p><p></p><p>I think a person needs to decide what velocity they want with a particular bullet, then look at which cartridge will safely achieve it. I certainly don't want to have to go to the hospital to have primer fragments dug out of my eyeball.(we all should wear our safety glasses--I know I don't always). Just some food for thought.</p></blockquote><p></p>
[QUOTE="sambo3006, post: 99227, member: 2740"] As some of the others have stated, dimensional differences in each rifle can make a difference on max load, but also not all 180 gr bullets (or any other for that matter) are created equal. The length of bearing surface makes a big difference in pressure. I stupidly loaded up 1 gr under what was listed as max with Retumbo for a 225gr bullet behind the 230 gr 338 failsafe in my 338RUM. Sticky bolt and ejector mark on case head! Dropped 3 grains, bolt opens smooth but still ejector mark on case head. When I thought about it, the Failsafe is a flat base bullet with a long bearing surface. The other guys are right. There is no such thing as a free lunch. The only way to generate more velocity at a given pressure (besides barrel length) is to have a load that reaches the top of the pressure curve faster and remains there longer--more area under the curve. I know we all want to maximize velocity in our rounds, but gosh, these rounds are impressive enough without pushing the pressure limits. 3300 fps with a 180 gr 30 cal bullet is pretty awesome. Kirby's rounds really push the performance limits, but they have a huge powder capacity to reach those velocities with safe pressure. I think a person needs to decide what velocity they want with a particular bullet, then look at which cartridge will safely achieve it. I certainly don't want to have to go to the hospital to have primer fragments dug out of my eyeball.(we all should wear our safety glasses--I know I don't always). Just some food for thought. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 RUM+180g btip+Retumbo
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