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Use any 180gr bullet data for the powder you want. Start low and work up. To find out col is a breeze. take a cleaning rod with a jag tip and run it down the barrel from the muzzle to the bolt face. Mark the rod right at the muzzle. Remove the bolt and drop one of the bullet's into the chamber. Run a wood pencil, dowel or what ever in behind the bullet to hold the bullet to the lands. Put the rod in again to the bullet tip and mark the cleaning rod at the muzzle again. Measure between the two marks and that's the distance from the bolt face to the bullet tip when stopped bu the lands. Set your seater die to that with that bullet and you'll have a load with the bullet just touching the lands. back off a bit from there to take the bullet off the lands.
Quote from: Don Fischer on June 30, 2013, 04:44:47 PMUse any 180gr bullet data for the powder you want. Start low and work up. To find out col is a breeze. take a cleaning rod with a jag tip and run it down the barrel from the muzzle to the bolt face. Mark the rod right at the muzzle. Remove the bolt and drop one of the bullet's into the chamber. Run a wood pencil, dowel or what ever in behind the bullet to hold the bullet to the lands. Put the rod in again to the bullet tip and mark the cleaning rod at the muzzle again. Measure between the two marks and that's the distance from the bolt face to the bullet tip when stopped bu the lands. Set your seater die to that with that bullet and you'll have a load with the bullet just touching the lands. back off a bit from there to take the bullet off the lands. once you know your chamber back off 20 thouth and work either way till you get the accuracy you want or need. good luck. BTW measure bullets from ogive for chambering
