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Rifles, Reloading, Optics, Equipment
Reloading
Please HELP!! Low pressure???
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<blockquote data-quote="orch" data-source="post: 1952638" data-attributes="member: 35688"><p>Are you set on using the 129gr Ablr's? I assume when you said you weren't finding much info it was for the 129's... there's lots of info out there on the 6.5rsaum but it'll mostly be for 140+ class of bullets.. anyways ya if it's throated long so your bullets got a long jump and you are at speeds like that with a 129 I'd suspect it's not expanding that case enough to seal off the chamber before your bullet leaves the case mouth... </p><p></p><p>Exactly how long is it throated for?</p><p></p><p>Possible solutions: </p><p>keep working up your charge weight until you get those cases expanding... you're in low pressure now so 1/2 gr increments should be ok... I've had 143's up over 3200fps in two of my 6.5rsaums before any signs of pressure so if you aren't hitting 3000fps with a 129 you have plenty of room to push it...one caveat may be you are getting slow speed because gas is leaking all the way past your case but I'm pretty sure you'd notice that...</p><p></p><p>Check your neck tension, are you using a bushing die?...not likely an issue but if your cases are barely gripping the bullet and you have a long jump you could be getting gasses back around the case from poor case expansion</p><p></p><p>Switch to a faster burning powder for the 129's and get a quicker pressure spike to get that case expanding</p><p></p><p>Switch to a heavier bullet, more mass means more energy required to move it... also bigger bullet means longer and it will be closer to the lands and should increase your pressure...</p><p></p><p>Orch</p></blockquote><p></p>
[QUOTE="orch, post: 1952638, member: 35688"] Are you set on using the 129gr Ablr’s? I assume when you said you weren’t finding much info it was for the 129’s... there’s lots of info out there on the 6.5rsaum but it’ll mostly be for 140+ class of bullets.. anyways ya if it’s throated long so your bullets got a long jump and you are at speeds like that with a 129 I’d suspect it’s not expanding that case enough to seal off the chamber before your bullet leaves the case mouth... Exactly how long is it throated for? Possible solutions: keep working up your charge weight until you get those cases expanding... you’re in low pressure now so 1/2 gr increments should be ok... I’ve had 143’s up over 3200fps in two of my 6.5rsaums before any signs of pressure so if you aren’t hitting 3000fps with a 129 you have plenty of room to push it...one caveat may be you are getting slow speed because gas is leaking all the way past your case but I’m pretty sure you’d notice that... Check your neck tension, are you using a bushing die?...not likely an issue but if your cases are barely gripping the bullet and you have a long jump you could be getting gasses back around the case from poor case expansion Switch to a faster burning powder for the 129’s and get a quicker pressure spike to get that case expanding Switch to a heavier bullet, more mass means more energy required to move it... also bigger bullet means longer and it will be closer to the lands and should increase your pressure... Orch [/QUOTE]
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Please HELP!! Low pressure???
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