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<blockquote data-quote="Shadowrider" data-source="post: 1058666" data-attributes="member: 3099">Blutch have you chamber checked your loads at that OAL?&nbsp; In my 9Pro the J&amp;K 147&#039;s are touching the rifling at 1.135.&nbsp; It&#039;s a bad thing that can cause a nasty pressure spike and it can keep the slide from going fully into battery (lockup) which is even potentially worse.&nbsp; They just clear at 1.13 in my barrel, so I load them to 1.11&quot;.To check them remove the barrel from your gun and drop a round into the chamber.&nbsp; Then spin it while it is fully inserted.&nbsp; It should spin FREELY.&nbsp; You can feel the rifling contacting the bullet.&nbsp; It will feel &quot;catchy&quot; if it&#039;s touching the rifling.&nbsp; You can also color the bullet with a black magic marker and look for marks on it.&nbsp; Adjust your seating die until it just&nbsp; spins freely, measure the length and adjust it in about .020&quot; deeper.&nbsp; The only thing that should stop the round in your chamber is the case mouth seating on the shoulder in your chamber.&nbsp; This is critical for proper lockup.&nbsp; Try to determine the length that it contacts in your barrel and seat them at least .020&quot; deeper.&nbsp; This directly applies to the bullets ogive and will be different for every bullet you load.&nbsp; For Instance the 125 grain J&amp;K doesn&#039;t hit my rifling at 1.15&quot; which is a longer OAL than I load the 147&#039;s.You are on the right track seating them as long as possible as accuracy is theoretically better.&nbsp; But you absolutely have to have some room for the bullet to &quot;get going&quot; before it contacts the rifling.</blockquote>

[QUOTE="Shadowrider, post: 1058666, member: 3099"] Blutch have you chamber checked your loads at that OAL? In my 9Pro the J&K 147's are touching the rifling at 1.135. It's a bad thing that can cause a nasty pressure spike and it can keep the slide from going fully into battery (lockup) which is even potentially worse. They just clear at 1.13 in my barrel, so I load them to 1.11". To check them remove the barrel from your gun and drop a round into the chamber. Then spin it while it is fully inserted. It should spin [B]FREELY[/B]. You can feel the rifling contacting the bullet. It will feel "catchy" if it's touching the rifling. You can also color the bullet with a black magic marker and look for marks on it. Adjust your seating die until it just spins freely, measure the length and adjust it in about .020" deeper. The only thing that should stop the round in your chamber is the case mouth seating on the shoulder in your chamber. This is critical for proper lockup. Try to determine the length that it contacts in your barrel and seat them at least .020" deeper. This directly applies to the bullets ogive and will be different for every bullet you load. For Instance the 125 grain J&K doesn't hit my rifling at 1.15" which is a longer OAL than I load the 147's. You are on the right track seating them as long as possible as accuracy is theoretically better. But you absolutely have to have some room for the bullet to "get going" before it contacts the rifling. [/QUOTE]

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