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Rifles, Reloading, Optics, Equipment
Reloading
OAL and TTL IMPoRTANCE??
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<blockquote data-quote="boomtube" data-source="post: 645600" data-attributes="member: 9215"><p><em>How important is the Overall Length of a fully completed round?</em></p><p> </p><p>Not much, if any, if the load is well developed. There's a window of good shooting OAL that's often as much as 15 thou wide. Seat in the middle and most common variations will have no effect.</p><p> </p><p> </p><p><em>"How important in the Trim to Length?"</em></p><p> </p><p>It isn't. All that's important is the chamber length and that is usually 20 thou or more than the max case length.</p><p> </p><p> </p><p><em>"Can there be a .001" variation between brass?"</em></p><p> </p><p>Easily.</p><p> </p><p> </p><p><em>"EX> .243 should be 2.025"OAL with HDY 65gr Vmax and sometimes i mess up and seat the bullet to 2.024 or 2.023..i also shave .001" too much sometimes while trimming."</em></p><p> </p><p>There is no "should be" about it, all a book OAL gives is the length the testers used to develop the listed data in their own rigs. It's no more a rule for us to blindly follow than their listed powder charges.</p><p> </p><p> </p><p><em>"I had 10 rounds all perfect TTL ..."</em></p><p> </p><p>I've been doing this since '65 and have to guess what your definition of a TTL is.</p><p> </p><p> </p><p><em>"...when i seat one bullet perfect my logic tells me that i shouldnt have to adjust the seating die and just push em through but sometimes its off and the bullet is seated too far already.why is this happening?"</em></p><p> </p><p>Irrelivant variations in bullet construction can easily cause 10 thou or more OAL variation to the meplat but no rifle cares where a bullet point hangs in space, all they care about is the jump to rifling contact. That's why many of us use some kind of 'bullet comparitor' to measure length from head to ogive.</p><p> </p><p> </p><p>"<em>How Precise does all the measurement have to be to keep consistency..obviously if theyre all the same itll be consistant but if i have the .001-.002 difference does that have an effect??"</em> </p><p> </p><p>Such tiny variations rarely mean anything at all unless you and your rig and your load are highly accurate and even then not unless you're right on the ragged edge of the good shooting window.</p></blockquote><p></p>
[QUOTE="boomtube, post: 645600, member: 9215"] [I]How important is the Overall Length of a fully completed round?[/I] Not much, if any, if the load is well developed. There's a window of good shooting OAL that's often as much as 15 thou wide. Seat in the middle and most common variations will have no effect. [I]"How important in the Trim to Length?"[/I] It isn't. All that's important is the chamber length and that is usually 20 thou or more than the max case length. [I]"Can there be a .001" variation between brass?"[/I] Easily. [I]"EX> .243 should be 2.025"OAL with HDY 65gr Vmax and sometimes i mess up and seat the bullet to 2.024 or 2.023..i also shave .001" too much sometimes while trimming."[/I] There is no "should be" about it, all a book OAL gives is the length the testers used to develop the listed data in their own rigs. It's no more a rule for us to blindly follow than their listed powder charges. [I]"I had 10 rounds all perfect TTL ..."[/I] I've been doing this since '65 and have to guess what your definition of a TTL is. [I]"...when i seat one bullet perfect my logic tells me that i shouldnt have to adjust the seating die and just push em through but sometimes its off and the bullet is seated too far already.why is this happening?"[/I] Irrelivant variations in bullet construction can easily cause 10 thou or more OAL variation to the meplat but no rifle cares where a bullet point hangs in space, all they care about is the jump to rifling contact. That's why many of us use some kind of 'bullet comparitor' to measure length from head to ogive. "[I]How Precise does all the measurement have to be to keep consistency..obviously if theyre all the same itll be consistant but if i have the .001-.002 difference does that have an effect??"[/I] Such tiny variations rarely mean anything at all unless you and your rig and your load are highly accurate and even then not unless you're right on the ragged edge of the good shooting window. [/QUOTE]
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OAL and TTL IMPoRTANCE??
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