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Rifles, Reloading, Optics, Equipment
Reloading
Can a load change its accuracy with time?
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<blockquote data-quote="MagnumManiac" data-source="post: 2177665" data-attributes="member: 10755"><p>It is not always caused by bullet weld.</p><p>I have made up loads and shot them 20 minutes later after completing load development for a comp shoot, which were perfectly fine in those parameters, but after a 4 hour road trip, those rounds changed and on the very first sighter shot I had a locked bolt. It could not be opened at the range, even with a hammer. Luckily I use PT&G one piece bolts because I had to chuck it in the lathe with the brake on and pound it open with a dead blow lead hammer. The case, what was left, was fused to the bolt face.</p><p>I removed the barrel and measured lug recesses and all was good. Only real damage was the extractor and ejector and a burn on the boot face where the primer let go.</p><p>Don't be fooled, powder settling in a case can change how it burns.</p><p>I tested this afterwards, cases charged without any settling and the powder being compressed slightly showed no excessive pressure, charges that were vibrated, with 1 grain less powder showed excessive pressure. I have a theory about this, but the Pressure Trace has not shown a conclusive result yet.</p><p>The above charge that was just poured into the case I call fluffy charging.</p><p>Cases that have either vibration or swirl charging, I call hard charged, because no more settling occurs even during transport.</p><p>Had this happen with RE25 and Retumbo twice now and in 300WM & 338-416 Rigby Improved.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2177665, member: 10755"] It is not always caused by bullet weld. I have made up loads and shot them 20 minutes later after completing load development for a comp shoot, which were perfectly fine in those parameters, but after a 4 hour road trip, those rounds changed and on the very first sighter shot I had a locked bolt. It could not be opened at the range, even with a hammer. Luckily I use PT&G one piece bolts because I had to chuck it in the lathe with the brake on and pound it open with a dead blow lead hammer. The case, what was left, was fused to the bolt face. I removed the barrel and measured lug recesses and all was good. Only real damage was the extractor and ejector and a burn on the boot face where the primer let go. Don’t be fooled, powder settling in a case can change how it burns. I tested this afterwards, cases charged without any settling and the powder being compressed slightly showed no excessive pressure, charges that were vibrated, with 1 grain less powder showed excessive pressure. I have a theory about this, but the Pressure Trace has not shown a conclusive result yet. The above charge that was just poured into the case I call fluffy charging. Cases that have either vibration or swirl charging, I call hard charged, because no more settling occurs even during transport. Had this happen with RE25 and Retumbo twice now and in 300WM & 338-416 Rigby Improved. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Can a load change its accuracy with time?
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