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Rifles, Reloading, Optics, Equipment
Reloading
Fire Forming
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<blockquote data-quote="orch" data-source="post: 645369" data-attributes="member: 35688"><p>hey there,</p><p></p><p></p><p>another technique you can use... it may take few extra steps but it works for me... </p><p></p><p>use either a 308win or 260rem case as your parent case and "partially" neck it down to 243 leaving a very small portion of the neck unsized at the case neck/shoulder junction forming a false shoulder that will form a seal in at the base of the neck area in the chamber upon chambering the round. this will hold the round concentric in the chamber with out having to jam the bullet into the lands... i just use a cheap light varmint style bullet loaded near max book load for said caliber and fire away... you may have to play around with how much of a false shoulder you need to leave... its not much, you just need enough that the round chambers "stiff" </p><p></p><p></p><p>i had to do this in my 25-06 ackley... the first box of factory winchester 25-06 ammo that i tried to use to make fireformed cases was apparently at the low end of saami headspace specks and wouldn't correctly contact the chamber neck/shoulder junction and kinda slumped down in the chamber. when i fired them they would come out unconcentric along the case body lenght with a bit of a bulge on one side starting at the web continuing lopsided up the case towards the shoulder... </p><p>i decided to switch to lapua brass after 40 rounds of frustration and could only get 30-06 lapua brass... the bullet i wanted to use for fireforming wouldn't reach the lands due to the long lead in the throat, a buddy of mine that loads a 270 gibbs suggested it try the false shoulder technique and i have had great results with it...</p><p></p><p>i can use great brass, every thing came out concentric and outta 100 cases i didnt have a single split neck... </p><p></p><p>orch</p></blockquote><p></p>
[QUOTE="orch, post: 645369, member: 35688"] hey there, another technique you can use... it may take few extra steps but it works for me... use either a 308win or 260rem case as your parent case and "partially" neck it down to 243 leaving a very small portion of the neck unsized at the case neck/shoulder junction forming a false shoulder that will form a seal in at the base of the neck area in the chamber upon chambering the round. this will hold the round concentric in the chamber with out having to jam the bullet into the lands... i just use a cheap light varmint style bullet loaded near max book load for said caliber and fire away... you may have to play around with how much of a false shoulder you need to leave... its not much, you just need enough that the round chambers "stiff" i had to do this in my 25-06 ackley... the first box of factory winchester 25-06 ammo that i tried to use to make fireformed cases was apparently at the low end of saami headspace specks and wouldn't correctly contact the chamber neck/shoulder junction and kinda slumped down in the chamber. when i fired them they would come out unconcentric along the case body lenght with a bit of a bulge on one side starting at the web continuing lopsided up the case towards the shoulder... i decided to switch to lapua brass after 40 rounds of frustration and could only get 30-06 lapua brass... the bullet i wanted to use for fireforming wouldn't reach the lands due to the long lead in the throat, a buddy of mine that loads a 270 gibbs suggested it try the false shoulder technique and i have had great results with it... i can use great brass, every thing came out concentric and outta 100 cases i didnt have a single split neck... orch [/QUOTE]
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