6.5x47 Lapua mod case
- Thread starter ffgats
- Start date
I searched online for my 6.5x47 Lapua, but I did not find one.
However now that I learned the finding barrel jam method (from watching Eric Cortina's video) for determining the distance to the lands, I no longer need the Hornady OAL gauge.
Take an empty fireformed case fired from your rifle. Neck size it (although instead you can full length size it like EC recommends). Barely seat a bullet in this dummy round, just barely enough so it can grip the bullet, NO PRIMER, NO POWDER.
Lube the bullet ogive with Imperial sizing wax. Place dummy round into the chamber. Close the bolt on it, (push hard to seat it), which seats the bullet to where its jammed into the lands. Pop open the bolt quickly, and the seated-to-lands dummy round should extract intact. You are done. Measure base to ogive for your jam length baseline. EC recommends starting 20 thou shorter than this length for safely starting load development. (You need to avoid excess pressure, so do not start load development touching the lands - give it lots of safe room, 20 thou shorter is good). If by chance the bullet pulls out of the case, you can use a cleaning rod from the muzzle with a flat insert to push it out. Its lubed so it should not be an issue. I have never had one stick using Imperial sizing wax.
Note that for shorter 6.5 bullets like Sierra 107gr and Lapua 108gr, there may be enough chamber length that the bullets never seat. That was the case in my 6.5x47 L. But the jam method worked for the longer 6.5 bullets no problem (shortest I have is 123gr Scenar).
Eric Cortina's Youtube title: "How to find jam on your barrel. Do this before load development"
link: https://www.youtube.com/watch?v=a7vjgEgnhHk
However now that I learned the finding barrel jam method (from watching Eric Cortina's video) for determining the distance to the lands, I no longer need the Hornady OAL gauge.
Take an empty fireformed case fired from your rifle. Neck size it (although instead you can full length size it like EC recommends). Barely seat a bullet in this dummy round, just barely enough so it can grip the bullet, NO PRIMER, NO POWDER.
Lube the bullet ogive with Imperial sizing wax. Place dummy round into the chamber. Close the bolt on it, (push hard to seat it), which seats the bullet to where its jammed into the lands. Pop open the bolt quickly, and the seated-to-lands dummy round should extract intact. You are done. Measure base to ogive for your jam length baseline. EC recommends starting 20 thou shorter than this length for safely starting load development. (You need to avoid excess pressure, so do not start load development touching the lands - give it lots of safe room, 20 thou shorter is good). If by chance the bullet pulls out of the case, you can use a cleaning rod from the muzzle with a flat insert to push it out. Its lubed so it should not be an issue. I have never had one stick using Imperial sizing wax.
Note that for shorter 6.5 bullets like Sierra 107gr and Lapua 108gr, there may be enough chamber length that the bullets never seat. That was the case in my 6.5x47 L. But the jam method worked for the longer 6.5 bullets no problem (shortest I have is 123gr Scenar).
Eric Cortina's Youtube title: "How to find jam on your barrel. Do this before load development"
link: https://www.youtube.com/watch?v=a7vjgEgnhHk
