Trying to find the "balance" here.
With 300 gr. A-Tips and CIP spec .338 Lapua chamber- seating "to the lands" results in the bearing surface of the bullet just above the boattail roughly at the CASE/shoulder junction.
Been digesting the latest article on PRB related to seating depth and jump- which flies in the face of what most of us had previously been told which was jam, or minimal jump with VLDs.
precisionrifleblog.com
Seating to "optimal" depth- with the top of the boattail just below the NECK/shoulder junction is giving me an OAL a few thou shy of 4".
Needless to say, never gonna mag feed- and I'd need to throat the chamber approx .250 just to load to the lands- adding for jump would currently be in the .300 range. That's a whole lotta freebore.
So trying to determine first, whether seating the bullet this deep (with the bearing surface down at the shoulder/case junction) would be compressing the load (91 gr H1000) excessively- and this is with NO jump. Jumping .040-.050 as recommended would shove the bullet that much further into the case.
If the recommendation of the gurus here is to throat it- how much? Seems one would want to seat the bullet somewhat deeper than "optimal", so that as the lands are chased I still have the full length of the neck on the bearing surface of the bullet?
What's the advice on how to approach this?
With 300 gr. A-Tips and CIP spec .338 Lapua chamber- seating "to the lands" results in the bearing surface of the bullet just above the boattail roughly at the CASE/shoulder junction.
Been digesting the latest article on PRB related to seating depth and jump- which flies in the face of what most of us had previously been told which was jam, or minimal jump with VLDs.
Bullet Jump Research: Executive Summary & Load Development Tips
This is the last post in a series of articles focused on bullet jump research that has been conduct...
precisionrifleblog.com Seating to "optimal" depth- with the top of the boattail just below the NECK/shoulder junction is giving me an OAL a few thou shy of 4".
Needless to say, never gonna mag feed- and I'd need to throat the chamber approx .250 just to load to the lands- adding for jump would currently be in the .300 range. That's a whole lotta freebore.
So trying to determine first, whether seating the bullet this deep (with the bearing surface down at the shoulder/case junction) would be compressing the load (91 gr H1000) excessively- and this is with NO jump. Jumping .040-.050 as recommended would shove the bullet that much further into the case.
If the recommendation of the gurus here is to throat it- how much? Seems one would want to seat the bullet somewhat deeper than "optimal", so that as the lands are chased I still have the full length of the neck on the bearing surface of the bullet?
What's the advice on how to approach this?
