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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Heavy hunting bullet for 10 twist, 26", 300RUM?
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<blockquote data-quote="jmden" data-source="post: 156301" data-attributes="member: 1742"><p><strong>Re: Heavy hunting bullet for 10 twist, 26\", 300RUM?</strong></p><p></p><p>Some info via email from Kirby:</p><p></p><p>My original email:</p><p></p><p>I'd been hoping to hear from you on LRH regarding this, but am too curious to wait. </p><p></p><p>You had been testing some 215-220g .308 WC's—I think they were the new Al tipped version. You mentioned on LRH that you were going to test them in a 10 twist. Did you get a chance to do that? I'm still wondering if there's any chance that they might stabilize in my 10 twist, 26" at 300 RUM velocities.</p><p></p><p>APS first reply:</p><p></p><p>I did test them some in a Lawton 1-8 twist barrel but this barrel ripped them apart because of to much baring surface compression. I have a specially designed thin land Satern barrel that should be here anytime which should work much better with them but until it gets here I really have nothing more to offer as far as data on these bullets.</p><p></p><p>I can say there is really no chance I see of them stabilizing in a 1-10 barrel. A 1-9 possibly if driven to very high velocities but I suspect a 1-8 will be about perfect. Again, these are only predictions but I have shot them out of factory Rem 700 300 RUM rifles with 1-10 twists and they never made it to the target.</p><p></p><p>My reply:</p><p></p><p>OK. Thanks for the info.</p><p></p><p>I talked to Richard last night and he thought the new Al tipped 210's should stabilize in the 10 twist, but with the thin jacket I'm not sure about close up shots with it and besides a morning and night spotting/longrange spot, most of my elk shots are going to be within a 100 yds or so in the trees. So, I'm a little leery of using them—maybe if Richard uses the thicker Hairfield (sp) jackets and is satisfied with their quality, I'll look at them again. For now, I've got some 240 SMK's coming. </p><p></p><p>What I really need is an APS 300AX with 30" barrel, 8-9 twist and some 265 WCs or wait to see what happens with these Al tips!! Now if I could just convince my wife that I NEED it! </p><p></p><p>APS second reply:</p><p></p><p>They may stabilize the 210s in a 1-10 barrel. Just have to get some in the air and see.</p><p> </p><p>I have tested the 240 gr SMK in my 300 AX and they will survive the Lawton barrel just fine. Got them up to 3220 fps with WC872 powder which is WAY to slow in burn rate, ran out of powder volume long before I topped out in pressure.</p><p> </p><p>I will be testing with US869 here soon with that bullet and suspect 3300 fps may be realistic with top end pressures. </p><p> </p><p>I have kind of been holding off on 300 AX testing because I want to get RIchards bullets working with this new barrel. Ballistically, they will make all other 30 cal bullets simply obsolete.</p><p> </p><p>I would agree with you on the jacket thickness on close range impacts with the large Aluminum tips. Richard upgraded his 338 bullets for me to a MUCH heavier jacket to handle the strains of 3500 fps launch speeds in my 338 AM but this will also make them a much better big game bullet as well.</p><p></p><p>------------------------------------------------------------</p><p></p><p>Can't wait to see what these new bullet will do when Richard and Kirby get 'em all figured out.</p><p></p><p>Hope this update helps someone.</p></blockquote><p></p>
[QUOTE="jmden, post: 156301, member: 1742"] [b]Re: Heavy hunting bullet for 10 twist, 26\", 300RUM?[/b] Some info via email from Kirby: My original email: I’d been hoping to hear from you on LRH regarding this, but am too curious to wait. You had been testing some 215-220g .308 WC’s—I think they were the new Al tipped version. You mentioned on LRH that you were going to test them in a 10 twist. Did you get a chance to do that? I’m still wondering if there’s any chance that they might stabilize in my 10 twist, 26” at 300 RUM velocities. APS first reply: I did test them some in a Lawton 1-8 twist barrel but this barrel ripped them apart because of to much baring surface compression. I have a specially designed thin land Satern barrel that should be here anytime which should work much better with them but until it gets here I really have nothing more to offer as far as data on these bullets. I can say there is really no chance I see of them stabilizing in a 1-10 barrel. A 1-9 possibly if driven to very high velocities but I suspect a 1-8 will be about perfect. Again, these are only predictions but I have shot them out of factory Rem 700 300 RUM rifles with 1-10 twists and they never made it to the target. My reply: OK. Thanks for the info. I talked to Richard last night and he thought the new Al tipped 210’s should stabilize in the 10 twist, but with the thin jacket I’m not sure about close up shots with it and besides a morning and night spotting/longrange spot, most of my elk shots are going to be within a 100 yds or so in the trees. So, I’m a little leery of using them—maybe if Richard uses the thicker Hairfield (sp) jackets and is satisfied with their quality, I’ll look at them again. For now, I’ve got some 240 SMK’s coming. What I really need is an APS 300AX with 30” barrel, 8-9 twist and some 265 WCs or wait to see what happens with these Al tips!! Now if I could just convince my wife that I NEED it! APS second reply: They may stabilize the 210s in a 1-10 barrel. Just have to get some in the air and see. I have tested the 240 gr SMK in my 300 AX and they will survive the Lawton barrel just fine. Got them up to 3220 fps with WC872 powder which is WAY to slow in burn rate, ran out of powder volume long before I topped out in pressure. I will be testing with US869 here soon with that bullet and suspect 3300 fps may be realistic with top end pressures. I have kind of been holding off on 300 AX testing because I want to get RIchards bullets working with this new barrel. Ballistically, they will make all other 30 cal bullets simply obsolete. I would agree with you on the jacket thickness on close range impacts with the large Aluminum tips. Richard upgraded his 338 bullets for me to a MUCH heavier jacket to handle the strains of 3500 fps launch speeds in my 338 AM but this will also make them a much better big game bullet as well. ------------------------------------------------------------ Can't wait to see what these new bullet will do when Richard and Kirby get 'em all figured out. Hope this update helps someone. [/QUOTE]
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Heavy hunting bullet for 10 twist, 26", 300RUM?
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