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Rifles, Reloading, Optics, Equipment
Reloading
Help .010 off the lands??????
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<blockquote data-quote="woods" data-source="post: 332668" data-attributes="member: 6042"><p>I agree. I seat a normal cup and core or bonded bullet .025" off or a monolithic .050" off and by the time I have tried a couple of different bullets with a couple of different powders in ladder tests of 4 or 5 different powder charges, I have usually found a good load. That would make 2x2x4=16 different combinations minimum. It is all a matter of barrel timing anyway.</p><p></p><p>Also, and I can't prove this, but I believe that any variation in seating depth will have a greater effect if you are seating close anyway. For example if you are trying to seat .005" off and for various reasons you have a variance of +-.003" then the ocassional one will be at .002" off or at .008" off and that will have a greater effect than if you were trying to seat at .030" off and had a few at .027" off or at .033" off. I either seat into the lands or at least .020" off and monitor seating depth with a comparator on each bullet.</p><p></p><p>Need to watch bearing surface of the bullet also. The other day I was loading some 200 gr Accubonds and all of sudden had a big variance in seating depth. That prompted me to check the bullets and out of a dozen I checked there was a variance of .018". Now that was probably because I had mixed several boxes together but that prompted me to check more of my bullets. </p><p></p><p>I found the following comparator readings on the bullets :</p><p></p><p>.001" variation only with the 140 gr 6.5 SGK's</p><p>.002" variance on the following bullets: </p><p> 130 gr 6.5 Scirrocco</p><p> 160 gr 7 mm Accubond</p><p> 150 gr 7 mm SGK</p><p> 180 gr 308 TTSX</p><p> 225 gr 338 Accubond</p><p> 225 gr 338 TTSX</p><p>.018" variance on the 200 gr Accubond</p><p>.021" variance on the 180 gr Accubond (probably also because of mixed boxes)</p><p></p><p>There are so many factors that can influence OAL that trying to seat close to the lands is a tricky business IMO.</p></blockquote><p></p>
[QUOTE="woods, post: 332668, member: 6042"] I agree. I seat a normal cup and core or bonded bullet .025" off or a monolithic .050" off and by the time I have tried a couple of different bullets with a couple of different powders in ladder tests of 4 or 5 different powder charges, I have usually found a good load. That would make 2x2x4=16 different combinations minimum. It is all a matter of barrel timing anyway. Also, and I can't prove this, but I believe that any variation in seating depth will have a greater effect if you are seating close anyway. For example if you are trying to seat .005" off and for various reasons you have a variance of +-.003" then the ocassional one will be at .002" off or at .008" off and that will have a greater effect than if you were trying to seat at .030" off and had a few at .027" off or at .033" off. I either seat into the lands or at least .020" off and monitor seating depth with a comparator on each bullet. Need to watch bearing surface of the bullet also. The other day I was loading some 200 gr Accubonds and all of sudden had a big variance in seating depth. That prompted me to check the bullets and out of a dozen I checked there was a variance of .018". Now that was probably because I had mixed several boxes together but that prompted me to check more of my bullets. I found the following comparator readings on the bullets : .001" variation only with the 140 gr 6.5 SGK's .002" variance on the following bullets: 130 gr 6.5 Scirrocco 160 gr 7 mm Accubond 150 gr 7 mm SGK 180 gr 308 TTSX 225 gr 338 Accubond 225 gr 338 TTSX .018" variance on the 200 gr Accubond .021" variance on the 180 gr Accubond (probably also because of mixed boxes) There are so many factors that can influence OAL that trying to seat close to the lands is a tricky business IMO. [/QUOTE]
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Help .010 off the lands??????
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