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Rifles, Reloading, Optics, Equipment
Reloading
Bullet switch caused pressure
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<blockquote data-quote="entoptics" data-source="post: 1933069" data-attributes="member: 104268"><p>OP, did you measure the base to lands distance with the ELD, or just place the base to ogive the same as the Berger? Where the bullet contacts the lands isn't necessarily at 0.264 on the ogive. In fact, it's probably not, and will depend on the bullet shape and throat geometry. The lands are 0.256", so the bullet will likely touch somewhere between those diameters.</p><p></p><p>I had a brain fart the other day, and shot a batch of 7mm RM test loads 0.015" longer than the lands. I reran the tests a couple days later...</p><p></p><p>0.020" off the lands was ~40-60 fps slower than the ones that were hard jammed, using the exact same powder charges. Pressure showed up correspondingly sooner too, and I noticed the same issues with difficult chambering on a few of the loads, as I was obviously seating the bullet home with the bolt.</p></blockquote><p></p>
[QUOTE="entoptics, post: 1933069, member: 104268"] OP, did you measure the base to lands distance with the ELD, or just place the base to ogive the same as the Berger? Where the bullet contacts the lands isn't necessarily at 0.264 on the ogive. In fact, it's probably not, and will depend on the bullet shape and throat geometry. The lands are 0.256", so the bullet will likely touch somewhere between those diameters. I had a brain fart the other day, and shot a batch of 7mm RM test loads 0.015" longer than the lands. I reran the tests a couple days later... 0.020" off the lands was ~40-60 fps slower than the ones that were hard jammed, using the exact same powder charges. Pressure showed up correspondingly sooner too, and I noticed the same issues with difficult chambering on a few of the loads, as I was obviously seating the bullet home with the bolt. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Bullet switch caused pressure
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