keyholing

  1. R

    Bullets were fine, now keyholing after 150 rounds?

    Anyone ever have this happen before? I've been shooting 105 AMAX bullets from my factory Rem 700 .243 with 26" 1:9.125 twist barrel since I got it and they seemed fine, but after about 150 rounds through it, I had a few keyholes with the starting loads of retumbo which were fine before. Some...
  2. M

    What can cause "key-holing"??

    I was sighting in a GAP AR-10 for a MK 4 scope. In getting on paper two shots of South American R1M1 ball ammo "keyholed" the target... I had previously shot this ammo for the initial on paper for the BUIS with no problem... What could cause this?? Merlinn
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