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Rifles, Reloading, Optics, Equipment
Reloading
Load development in 80 + degrees
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<blockquote data-quote="jmason" data-source="post: 287375" data-attributes="member: 10486"><p>I think I might be confusing you. I had a load made up from the winter 57.7gr of H4831sc and 140 BTs. When it got warmer out it was causing a heavy bolt lift and smearing the base of the brass as well as leaving a ring from the plunger in the bolt face. If I put my ammo in a cooler and shoot it I have no issues. This load is using the same brass I developed it with which is on it's 8th firing and has been annealed every time since the 4th firing.</p><p></p><p>So I decided to work up a load in the warm weather with some 130 gr BT's and H4831sc which started to show pressure signs around 58 gr. which is a full grain under listed max in the book and QL. This is with brand new brass. It is a lighter bullet, but at about the same charge as the 140 gr bullets I begin to see pressure. Now the book load was tested with a 24" shelien barrel and I have a 26" factory. I am getting a heavy lift but no markings on the brass. </p><p></p><p>Where the need for a sanity check comes in is I'm thinking the lighter bullet should be able to go faster than the heavy one without showing pressure at the same charge weight. The new load work up is using virgin brass but I can't see after fire forming being able to step up another grain of powder.</p><p></p><p>Is it somewhat normal to see pressure signs this soon (low powder charge) in 80+ degree weather?</p></blockquote><p></p>
[QUOTE="jmason, post: 287375, member: 10486"] I think I might be confusing you. I had a load made up from the winter 57.7gr of H4831sc and 140 BTs. When it got warmer out it was causing a heavy bolt lift and smearing the base of the brass as well as leaving a ring from the plunger in the bolt face. If I put my ammo in a cooler and shoot it I have no issues. This load is using the same brass I developed it with which is on it's 8th firing and has been annealed every time since the 4th firing. So I decided to work up a load in the warm weather with some 130 gr BT's and H4831sc which started to show pressure signs around 58 gr. which is a full grain under listed max in the book and QL. This is with brand new brass. It is a lighter bullet, but at about the same charge as the 140 gr bullets I begin to see pressure. Now the book load was tested with a 24" shelien barrel and I have a 26" factory. I am getting a heavy lift but no markings on the brass. Where the need for a sanity check comes in is I'm thinking the lighter bullet should be able to go faster than the heavy one without showing pressure at the same charge weight. The new load work up is using virgin brass but I can't see after fire forming being able to step up another grain of powder. Is it somewhat normal to see pressure signs this soon (low powder charge) in 80+ degree weather? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Load development in 80 + degrees
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