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Rifles, Reloading, Optics, Equipment
Reloading
243 Ackley Improved Problems
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<blockquote data-quote="Trickymissfit" data-source="post: 939279" data-attributes="member: 25383"><p>listen to "JE", as he's telling you the right way to setup the headspace in an Ackley chamber. Parker always set the chambers up the be somewhat tight at the junction of the neck to shoulder. By doing it this way you can still shoot standard generic .243 Win. in that chamber.</p><p> </p><p>Now the O.P.'s chamber maybe reamed out of spec, or maybe it's a .264" necked chamber. We don't know because we don't have it in front of us! Myself presented with this situation, the first thing I'd do is to pull the barrel for a better look see. If I don't physically see something wrong in the chamber, I would probably do a chamber cast. The chamber cast done right will also show me what the throat looks like. Is it reamed somewhat short to fit 70 grain bullets? (I don't think this is the problem).</p><p> </p><p>Here's some things you could do:</p><p> </p><p>* take a couple factory sized .243 cases, and neck turn them down to about .262" in diameter. If the cases will chamber, you might have a tight necked chamber. If so you'll be neck turning every case (no big deal)</p><p> </p><p>* This part is a little tricky, so bear with me. If you have a Stoney Point gauge or the newer Hornaday gauge you have the tool to start with. You really need two bushings, and a modified case. Myself, I'd would want on that's about .002" / .005" larger than the neck diameter of the case. Plus another that's about .370"/.375" bushing. With the modified case, you may well find the neck diameter a little undersized (my 6mm case is for sure). Will the modified case chamber? If it does, I'd be looking at the neck diameter. With the barrel removed, I'd try to put a full length sized case in the chamber ( factory). </p><p> </p><p>You could simply break down a factory load, (kill the primer) and set the die up to push the shoulder back about .005". Will it chamber? If not push that shoulder back another .005". If it still won't chamber, I'd be doing a barrel set back with a new chamber. I know some guys that will push a shoulder back as much as .015", and glue plastic shims to the face of the case to get the head space number. The chamber may well have been reamed short, or at least in the very minimum side. Are you sure it's an Ackley chamber and not a .243 Rockchucker? They are similar, but one uses a 30 degree shoulder. That's why I'd do a chamber cast just to know what I have!</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 939279, member: 25383"] listen to "JE", as he's telling you the right way to setup the headspace in an Ackley chamber. Parker always set the chambers up the be somewhat tight at the junction of the neck to shoulder. By doing it this way you can still shoot standard generic .243 Win. in that chamber. Now the O.P.'s chamber maybe reamed out of spec, or maybe it's a .264" necked chamber. We don't know because we don't have it in front of us! Myself presented with this situation, the first thing I'd do is to pull the barrel for a better look see. If I don't physically see something wrong in the chamber, I would probably do a chamber cast. The chamber cast done right will also show me what the throat looks like. Is it reamed somewhat short to fit 70 grain bullets? (I don't think this is the problem). Here's some things you could do: * take a couple factory sized .243 cases, and neck turn them down to about .262" in diameter. If the cases will chamber, you might have a tight necked chamber. If so you'll be neck turning every case (no big deal) * This part is a little tricky, so bear with me. If you have a Stoney Point gauge or the newer Hornaday gauge you have the tool to start with. You really need two bushings, and a modified case. Myself, I'd would want on that's about .002" / .005" larger than the neck diameter of the case. Plus another that's about .370"/.375" bushing. With the modified case, you may well find the neck diameter a little undersized (my 6mm case is for sure). Will the modified case chamber? If it does, I'd be looking at the neck diameter. With the barrel removed, I'd try to put a full length sized case in the chamber ( factory). You could simply break down a factory load, (kill the primer) and set the die up to push the shoulder back about .005". Will it chamber? If not push that shoulder back another .005". If it still won't chamber, I'd be doing a barrel set back with a new chamber. I know some guys that will push a shoulder back as much as .015", and glue plastic shims to the face of the case to get the head space number. The chamber may well have been reamed short, or at least in the very minimum side. Are you sure it's an Ackley chamber and not a .243 Rockchucker? They are similar, but one uses a 30 degree shoulder. That's why I'd do a chamber cast just to know what I have! gary [/QUOTE]
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