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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
30 CODY EXPRESS
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<blockquote data-quote="Darryl Cassel" data-source="post: 22747" data-attributes="member: 34"><p>Texas</p><p></p><p>The 416 Rigby Imp and the 378 Weatherby IMP have the SAME case capacity.</p><p></p><p>I shoot 122.5 grs of WC872 in my 338/416 IMP and a 37" barrel and that gives me a top speed of 3310 FPS with a 300 gr 338 bullet. It will be from 3278 to 3310 FPS with that powder charge. </p><p></p><p>I have to question the velocity of "only" 85 Grs of 4831 and the 250 gr 30 cal bullet. I shoot 78 gr of 4831 in my standard 300 Weatherby 1000 yard match guns with 220 gr bullets and the velocity is right at 3040 FPS. I'm only 7 grs less of the same powder. You think for a moment that that guy is pushing a 30 gr heavier bullet at 3900 FPS with that?? NO WAY</p><p></p><p>I have had many 30/378 Weatherbys and have friends who have the 30/416 IMP and they can get no where near that velocity out of a 250 gr bullet. They have long barrels too at least 36".</p><p></p><p>That fellow will have to show me that load being shot over an Oehler Chronagraph and with only a 34" barrel pushing a 250 gr bullet at 3900FPS using 85 grs of 4831-----NO WAY. Maybe he has a "Chrony" chronagraph? </p><p></p><p>It's hard to believe what some publishers allow to be printed in their books before first testing it out and proving what has been said.</p><p></p><p>I would do this, I'll put my Tomahawk up against the 30/416 Imp with him using 250 gr bullets and 85 grs of 4831 and me with 240 Gr MKs and I don't believe he will be ahead of me in velocity. I use 104 grs of 872 in my Tomahawk Now if he shoots 125 grs of a slow powder behind that 250 gr bullet, he will increase the velocity but, to no where near 3900 FPS---He might just get 3400 FPS though.</p><p></p><p>Wonder what my 44" barrel chambered for the Tomahawk would give ??? Lets see, a 34" barrel is giving me 3200 with a 240 gr MK--another 10" of barrel should give me another 200 to 250 FPS.</p><p></p><p>Now my 44" barrel is going to be chambered for the Tomahawk for sure. Just a matter of time.</p><p></p><p>I use to read what some people were getting out of a LR cartridge and most times I would chamber it up and see for myself. The 6.5/300 Weatherby and the 7mm/300 Weatherby were two examples. Then came the 30/378 and 30/378 IMP and all the other 30 cal IMP cartridges plus the 338/416 ImP. </p><p>When I read where someone with only 85 grs of 4831 and a 250 gr 30 Cal bullet out of a 34" barrel making a claim of 3900 FPS, that throws up a RED flag right away.</p><p></p><p>I have learned long ago, don't believe everything you read in a publication.</p><p>Check the testing that was done and with what equipment they used.</p><p>3900 FPS from a 250 gr 30 cal bullet in a 416 size case using ONLY 85 gr of 4831 is "not" possible.</p><p></p><p>Later</p><p>DC</p><p></p><p>[ 07-04-2002: Message edited by: Darryl Cassel ]</p></blockquote><p></p>
[QUOTE="Darryl Cassel, post: 22747, member: 34"] Texas The 416 Rigby Imp and the 378 Weatherby IMP have the SAME case capacity. I shoot 122.5 grs of WC872 in my 338/416 IMP and a 37" barrel and that gives me a top speed of 3310 FPS with a 300 gr 338 bullet. It will be from 3278 to 3310 FPS with that powder charge. I have to question the velocity of "only" 85 Grs of 4831 and the 250 gr 30 cal bullet. I shoot 78 gr of 4831 in my standard 300 Weatherby 1000 yard match guns with 220 gr bullets and the velocity is right at 3040 FPS. I'm only 7 grs less of the same powder. You think for a moment that that guy is pushing a 30 gr heavier bullet at 3900 FPS with that?? NO WAY I have had many 30/378 Weatherbys and have friends who have the 30/416 IMP and they can get no where near that velocity out of a 250 gr bullet. They have long barrels too at least 36". That fellow will have to show me that load being shot over an Oehler Chronagraph and with only a 34" barrel pushing a 250 gr bullet at 3900FPS using 85 grs of 4831-----NO WAY. Maybe he has a "Chrony" chronagraph? It's hard to believe what some publishers allow to be printed in their books before first testing it out and proving what has been said. I would do this, I'll put my Tomahawk up against the 30/416 Imp with him using 250 gr bullets and 85 grs of 4831 and me with 240 Gr MKs and I don't believe he will be ahead of me in velocity. I use 104 grs of 872 in my Tomahawk Now if he shoots 125 grs of a slow powder behind that 250 gr bullet, he will increase the velocity but, to no where near 3900 FPS---He might just get 3400 FPS though. Wonder what my 44" barrel chambered for the Tomahawk would give ??? Lets see, a 34" barrel is giving me 3200 with a 240 gr MK--another 10" of barrel should give me another 200 to 250 FPS. Now my 44" barrel is going to be chambered for the Tomahawk for sure. Just a matter of time. I use to read what some people were getting out of a LR cartridge and most times I would chamber it up and see for myself. The 6.5/300 Weatherby and the 7mm/300 Weatherby were two examples. Then came the 30/378 and 30/378 IMP and all the other 30 cal IMP cartridges plus the 338/416 ImP. When I read where someone with only 85 grs of 4831 and a 250 gr 30 Cal bullet out of a 34" barrel making a claim of 3900 FPS, that throws up a RED flag right away. I have learned long ago, don't believe everything you read in a publication. Check the testing that was done and with what equipment they used. 3900 FPS from a 250 gr 30 cal bullet in a 416 size case using ONLY 85 gr of 4831 is "not" possible. Later DC [ 07-04-2002: Message edited by: Darryl Cassel ] [/QUOTE]
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