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The Range
Ammo & Reloading
Handload Performance at 600 Yards and Beyond?
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<blockquote data-quote="Larry Morgan" data-source="post: 2800988" data-attributes="member: 4676"><p>Dunno if anyone has asked this yet? Did you deep clean the barrel somewhere in there? If you did, then that's not terribly surprising as the fouling will change as it builds. Powders are also known to have lot to lot variations, so if the lot changed in there somewhere, it may have caused the load to tweak too. </p><p></p><p>Also, neck tension in terms of interference fit is a bit of a red herring. It's a fist pass way to control what you would think of as neck tension, but neck tension is just that: tension. The only way to check it really is to measure force on the bullet during seating (which some high power and benchresters do). Some people argue the effect of neck tension when the bullet is seated into the lands, but whatever. It can be affected by lubricity inside the neck, brass hardness, brass thickness, etc, etc. I had an extreme example of this in that my uncalibrated right arm could even detect. It was what caused me to vow to never use federal cases for serious reloads. After using quite a few other brands, I decided to dig out some FGMM cases just for the heck of it. During seating, about 3 out of 5 would have more seating force than I've ever felt, then 1 or 2 would be about what I was used to. I loaded the rest of the rounds and designated them "plinking". I half expected to see some neck-splits, but none did. </p><p></p><p>You can moly-lube the case necks as well to try to get it more consistent, but that might be excessive. Also, personally, I would not test for groups with a chrony attached. There's no way I could ever convince myself that hanging that big weight on there doesn't affect the resonance of the barrel, therefore changing where the bullet is released from the barrel in terms of peak or trough of vibration (aka in the node). It's very common to have a barrel speed up as it wears in. It will screw with the load pressure as well.</p></blockquote><p></p>
[QUOTE="Larry Morgan, post: 2800988, member: 4676"] Dunno if anyone has asked this yet? Did you deep clean the barrel somewhere in there? If you did, then that's not terribly surprising as the fouling will change as it builds. Powders are also known to have lot to lot variations, so if the lot changed in there somewhere, it may have caused the load to tweak too. Also, neck tension in terms of interference fit is a bit of a red herring. It's a fist pass way to control what you would think of as neck tension, but neck tension is just that: tension. The only way to check it really is to measure force on the bullet during seating (which some high power and benchresters do). Some people argue the effect of neck tension when the bullet is seated into the lands, but whatever. It can be affected by lubricity inside the neck, brass hardness, brass thickness, etc, etc. I had an extreme example of this in that my uncalibrated right arm could even detect. It was what caused me to vow to never use federal cases for serious reloads. After using quite a few other brands, I decided to dig out some FGMM cases just for the heck of it. During seating, about 3 out of 5 would have more seating force than I've ever felt, then 1 or 2 would be about what I was used to. I loaded the rest of the rounds and designated them "plinking". I half expected to see some neck-splits, but none did. You can moly-lube the case necks as well to try to get it more consistent, but that might be excessive. Also, personally, I would not test for groups with a chrony attached. There's no way I could ever convince myself that hanging that big weight on there doesn't affect the resonance of the barrel, therefore changing where the bullet is released from the barrel in terms of peak or trough of vibration (aka in the node). It's very common to have a barrel speed up as it wears in. It will screw with the load pressure as well. [/QUOTE]
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