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Rifles, Reloading, Optics, Equipment
Reloading
300 Norma 215 Berger H1000
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<blockquote data-quote="jensenj71" data-source="post: 2831198" data-attributes="member: 96797"><p>I have a 300NMI that slows down nearly 50fps on a clean bare metal barrel. It takes 20-25 rounds for velocities to walk back up and stabilize for a given load of N568 and 230 OTM. It stabilizes at the same 3010fps with single digit es on a 26" Proof barrel. I am holding 0.5MOA at 600yds. </p><p></p><p>I thought I was losing my mind during load development when my developed load opened up dramatically after cleaning. I did borescope it at 5, 10 and 20 rounds last time around and there is definitely a difference in appearance as the barrel fouls. </p><p></p><p>Has anyone else seen a 300NM or NMI take 20 rounds for velocities to stabilize after cleaning? Normally I fire a couple fouling shots and then a 5 shot group to confirm things after cleaning a barrel.</p></blockquote><p></p>
[QUOTE="jensenj71, post: 2831198, member: 96797"] I have a 300NMI that slows down nearly 50fps on a clean bare metal barrel. It takes 20-25 rounds for velocities to walk back up and stabilize for a given load of N568 and 230 OTM. It stabilizes at the same 3010fps with single digit es on a 26" Proof barrel. I am holding 0.5MOA at 600yds. I thought I was losing my mind during load development when my developed load opened up dramatically after cleaning. I did borescope it at 5, 10 and 20 rounds last time around and there is definitely a difference in appearance as the barrel fouls. Has anyone else seen a 300NM or NMI take 20 rounds for velocities to stabilize after cleaning? Normally I fire a couple fouling shots and then a 5 shot group to confirm things after cleaning a barrel. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
300 Norma 215 Berger H1000
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