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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
243 falling on it's face
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<blockquote data-quote="BallisticsGuy" data-source="post: 1487955" data-attributes="member: 96226"><p>Okie dokie... IMR 4831 is too slow for 75's. You need a powder with a burn rate closer to IMR 4895. That would pump you just over 3400fps at 41gn charge weight (max). Come down to 40 grains and you should see 3300. You can't run the same powder for light bullets and heavy bullets and expect both to perform. They need different powders.</p><p></p><p>Now, with the 107's, yeah that's a little slow but not that far off what you should expect. It's almost 200fps slow though so I'm betting that you're not getting enough chamber pressure before the bullet leaves the neck and it's entering the throat soft. Part of that would possibly be helped by snugging up the neck tension or possibly by seating to touch the lands. I don't like those solutions though as they don't have legs for the long run.</p><p></p><p>You should definitely try a magnum primer to get better light-off but honestly, IMR-4831 is not a great powder choice if velocity is what you want. I can tell you that around 42-43gn of Reloader 23 will push you just over 3k fps easily (experience with 107/108's there). At 40 grains it'll be down around 2800 and soft on pressures.</p><p></p><p>Now to the marrow: Retumbo/H1000/Win 780/Reloader 22 and other proper magnum powders are where you need to go with the 107's. I found that I got better results with VERY slow powders and heavy bullets in .243win and much tighter SD's by going with a fairly warm primer. CCI MLRP's, Winchester LRP and F215's all served very well. Winchester LRPs (marked for "regular or magnum loads") worked the best in my particular loads.</p><p></p><p>HTH!</p><p></p><p>FWIW, right now I'm running 45.7gn of RL23 in a .243AI under 115DTAC's and getting 3200fps with totally sane pressures from a 26" Columbia River Arms barrel. I started with 108 ELD-M's and 55gn varmint pills during fire forming and got a lot of load data out of that development cycle.</p></blockquote><p></p>
[QUOTE="BallisticsGuy, post: 1487955, member: 96226"] Okie dokie... IMR 4831 is too slow for 75's. You need a powder with a burn rate closer to IMR 4895. That would pump you just over 3400fps at 41gn charge weight (max). Come down to 40 grains and you should see 3300. You can't run the same powder for light bullets and heavy bullets and expect both to perform. They need different powders. Now, with the 107's, yeah that's a little slow but not that far off what you should expect. It's almost 200fps slow though so I'm betting that you're not getting enough chamber pressure before the bullet leaves the neck and it's entering the throat soft. Part of that would possibly be helped by snugging up the neck tension or possibly by seating to touch the lands. I don't like those solutions though as they don't have legs for the long run. You should definitely try a magnum primer to get better light-off but honestly, IMR-4831 is not a great powder choice if velocity is what you want. I can tell you that around 42-43gn of Reloader 23 will push you just over 3k fps easily (experience with 107/108's there). At 40 grains it'll be down around 2800 and soft on pressures. Now to the marrow: Retumbo/H1000/Win 780/Reloader 22 and other proper magnum powders are where you need to go with the 107's. I found that I got better results with VERY slow powders and heavy bullets in .243win and much tighter SD's by going with a fairly warm primer. CCI MLRP's, Winchester LRP and F215's all served very well. Winchester LRPs (marked for "regular or magnum loads") worked the best in my particular loads. HTH! FWIW, right now I'm running 45.7gn of RL23 in a .243AI under 115DTAC's and getting 3200fps with totally sane pressures from a 26" Columbia River Arms barrel. I started with 108 ELD-M's and 55gn varmint pills during fire forming and got a lot of load data out of that development cycle. [/QUOTE]
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