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The Range
Ammo & Reloading
bullet seating depth
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<blockquote data-quote="swampratt" data-source="post: 2828264" data-attributes="member: 15054"><p>A lot of my guns have the bullets seated longer than max OAL that books state.</p><p>Do you determine neck tension by measuring diameter of neck? </p><p>Yes.. measure neck ID and bullet od..if there is .002" less ID in the case then you have what is refereed to as .002" neck tension.</p><p></p><p>There are many bullets that do not have the "bullet diameter" into the neck when seated</p><p></p><p>I seat a bullet in a dummy round like you did. I seat it long, Then color the bullet from the tip to the bearing surface with a sharpie.</p><p>I measure the OAL.</p><p>I then insert this into the chamber and close the bolt. The oal will change as the bullet is seated deeper into the case.</p><p>I open the bolt and remove the round and measure again.</p><p></p><p>NOTICE the marks on the bullet where you colored it with the sharpie.</p><p>I continue to seat the bullet deeper and deeper until it no longer has any marks on the sharpie colored area.</p><p></p><p></p><p>There is a point where you will have marks but the bullet is not stuck..The guns i have usually have .020-.030" area where you can seat the bullet into the lands making marks on the colored round.. but no stiff bolt lift .</p><p></p><p>Some bullets i have liked to be jammed into the lands for best accuracy..so Basically touching the lands for .030" and then another .010" more.</p><p></p><p>Not a good practice. especially if you need to extract the unfired round..the bullet may stay in the tube and a case of spilling powder comes out.</p><p></p><p>Handloaders will try many depths and wizardry to get that accurate round.</p><p></p><p>mark a bullet with a sharpie and chamber it and see if you get marks on it..if you are chasing the lands.</p></blockquote><p></p>
[QUOTE="swampratt, post: 2828264, member: 15054"] A lot of my guns have the bullets seated longer than max OAL that books state. Do you determine neck tension by measuring diameter of neck? Yes.. measure neck ID and bullet od..if there is .002" less ID in the case then you have what is refereed to as .002" neck tension. There are many bullets that do not have the "bullet diameter" into the neck when seated I seat a bullet in a dummy round like you did. I seat it long, Then color the bullet from the tip to the bearing surface with a sharpie. I measure the OAL. I then insert this into the chamber and close the bolt. The oal will change as the bullet is seated deeper into the case. I open the bolt and remove the round and measure again. NOTICE the marks on the bullet where you colored it with the sharpie. I continue to seat the bullet deeper and deeper until it no longer has any marks on the sharpie colored area. There is a point where you will have marks but the bullet is not stuck..The guns i have usually have .020-.030" area where you can seat the bullet into the lands making marks on the colored round.. but no stiff bolt lift . Some bullets i have liked to be jammed into the lands for best accuracy..so Basically touching the lands for .030" and then another .010" more. Not a good practice. especially if you need to extract the unfired round..the bullet may stay in the tube and a case of spilling powder comes out. Handloaders will try many depths and wizardry to get that accurate round. mark a bullet with a sharpie and chamber it and see if you get marks on it..if you are chasing the lands. [/QUOTE]
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