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Rifles, Reloading, Optics, Equipment
Reloading
Setting neck tension with expander mandrel and bushing die questions
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<blockquote data-quote="Blackhawk" data-source="post: 1883017" data-attributes="member: 105459"><p><strong><em>" Points To Ponder"</em></strong></p><p>At least when you use the Sinclair Expander Die Body you can elect to expand your case neck's I.D. by + .001" by using the correct Expander Mandel.</p><p>The over size +.001" will allow you to easily have your cases mouth slide over your neck turning tool in order to neck turn and thus remove any TIR Concentricity issiues.</p><p>The undersize mandrel will lets say expand your already FL resized brass that has been sized with a bushing die back to a diameter that will allow your bullet to easily start into your case mouth. This step can be done for jacketed bullets, however it is usually performed prior to the seating of lead bullets.</p><p>With the above statement I feel that I must qualify.</p><p>When you use a bushing FL resizer normally your bushing would be -.002 = -.003" under your case neck diameter with a bullet that has been seated. That is in theory ,however I have found that in order to achieve a uniformly even neck tension you may wind up on the plus or minus side of your initial measurement. This may result in your having to purchase additional sizing bushings say + or - .001" from your reference dimension. This will become more inherent if you order your FL bushing before you have reduced your case necks dimensions by as little as -.0002 -.0005" by the neck turning as noted above . You may find your neck tension has also gotten looser hence your need for a smaller bushing.</p><p>On the other hand if your brass case necks ID is too small you can re establish the correct size ( -.001") to allow for your bullet to be correctly start into your case mouth while still retaining correct bullet tension by simple insertion of your mandrel.</p><p>Your neck tension is extremely critical in order to retain your bullet jump dimension you may even have to go smaller in order to keep it constant.</p><p>I have found that neck tension will vary from manufacturer to manufacturer of brass shell cases. This is partially because of the brass itself. The construction and composition of brass will be slightly different more so with brass manufactured overseas ( Norma & Lapua ) to name a few or military brass, or range brass itself which could be a mixture of anything and everything.</p><p>In essence what I am trying to say is that experimentation on your part is what you must perform in order to just find that optimal setting.</p><p>Either your expansion or reduction mandrels are tapered and do not require a lot of downward pressure to obtain the desired results.</p><p>The key here is to be constant and apply the same amount of pressure all the time.</p><p>OBTW If you have a case neck that has been damaged by striking a table or cement upon extraction and now will not fit into your FL busing die ,either mandrel can repair said case neck so that it is usable.</p><p><strong><em>Just my 2 cents worth!</em></strong></p></blockquote><p></p>
[QUOTE="Blackhawk, post: 1883017, member: 105459"] [B][I]" Points To Ponder"[/I][/B] At least when you use the Sinclair Expander Die Body you can elect to expand your case neck's I.D. by + .001" by using the correct Expander Mandel. The over size +.001" will allow you to easily have your cases mouth slide over your neck turning tool in order to neck turn and thus remove any TIR Concentricity issiues. The undersize mandrel will lets say expand your already FL resized brass that has been sized with a bushing die back to a diameter that will allow your bullet to easily start into your case mouth. This step can be done for jacketed bullets, however it is usually performed prior to the seating of lead bullets. With the above statement I feel that I must qualify. When you use a bushing FL resizer normally your bushing would be -.002 = -.003" under your case neck diameter with a bullet that has been seated. That is in theory ,however I have found that in order to achieve a uniformly even neck tension you may wind up on the plus or minus side of your initial measurement. This may result in your having to purchase additional sizing bushings say + or - .001" from your reference dimension. This will become more inherent if you order your FL bushing before you have reduced your case necks dimensions by as little as -.0002 -.0005" by the neck turning as noted above . You may find your neck tension has also gotten looser hence your need for a smaller bushing. On the other hand if your brass case necks ID is too small you can re establish the correct size ( -.001") to allow for your bullet to be correctly start into your case mouth while still retaining correct bullet tension by simple insertion of your mandrel. Your neck tension is extremely critical in order to retain your bullet jump dimension you may even have to go smaller in order to keep it constant. I have found that neck tension will vary from manufacturer to manufacturer of brass shell cases. This is partially because of the brass itself. The construction and composition of brass will be slightly different more so with brass manufactured overseas ( Norma & Lapua ) to name a few or military brass, or range brass itself which could be a mixture of anything and everything. In essence what I am trying to say is that experimentation on your part is what you must perform in order to just find that optimal setting. Either your expansion or reduction mandrels are tapered and do not require a lot of downward pressure to obtain the desired results. The key here is to be constant and apply the same amount of pressure all the time. OBTW If you have a case neck that has been damaged by striking a table or cement upon extraction and now will not fit into your FL busing die ,either mandrel can repair said case neck so that it is usable. [B][I]Just my 2 cents worth![/I][/B] [/QUOTE]
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Setting neck tension with expander mandrel and bushing die questions
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