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Rifles, Reloading, Optics, Equipment
Reloading
COW Fireforming recipe
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<blockquote data-quote="nksmfamjp" data-source="post: 2533069" data-attributes="member: 1951"><p>I thought I posted this somewhere else, but I did not.</p><p></p><p>First:</p><p>The formal instructions </p><p>[URL unfurl="true"]https://bulletin.accurateshooter.com/2017/02/how-to-fire-form-brass-without-bullets/[/URL]</p><p></p><p>Found this reference for starting charge weight.</p><p>[URL unfurl="true"]https://gundigest.com/gear-ammo/reloading/the-ins-and-outs-of-fireforming-cases[/URL]</p><p></p><p>My cases I'm forming are new Starline 270 Win to 300 Sherman….So, I</p><p></p><p>Annealed new Starline brass</p><p>Expanded to 338 cal</p><p>Ran through the FL die with bushing 0.002" under neck diameter. Sized until bolt would close with a moderate force. Too heavy for hunting or Benchrest.</p><p>Anneal again</p><p>Put clay in primer cavity. Filled with titegroup to just spilling over. Weighed that charge at 57.8gr. 1/10th was ~6 gr.</p><p>Prime with large rifle primers</p><p>Made ladder from 6 to 15gr in 1gr increments using Titegroup </p><p>fill with 2 1/2 min Cream of Wheat to about 1/2 full neck</p><p>Cap with 1" square of TP pressed in with a punch</p><p>Shot the ladder.</p><p></p><p>Results: </p><p>6-7 gr….CBTD not fully achieved. About 0.001" short; shoulder shape about 90% formed; case length 2.480"</p><p>7-10 gr….CBTD at max; shoulder shape not fully formed; Case length about 2.480"</p><p>11-15 gr….CBTD at max; shoulder shape 98% or better; case length varies 2.480" down to 2.474" at max</p><p></p><p>I am making final loads at 11 gr. Otherwise recipe is same.</p><p></p><p>Necks are 0.050" shorter than spec. I wonder how that will affect accuracy. I prefer the neck length were bullet diameter long. I think they will be short of that.</p><p></p><p>Resulting case will be about 70-75gr h20, I think. I'll measure today and share result.</p></blockquote><p></p>
[QUOTE="nksmfamjp, post: 2533069, member: 1951"] I thought I posted this somewhere else, but I did not. First: The formal instructions [URL unfurl="true"]https://bulletin.accurateshooter.com/2017/02/how-to-fire-form-brass-without-bullets/[/URL] Found this reference for starting charge weight. [URL unfurl="true"]https://gundigest.com/gear-ammo/reloading/the-ins-and-outs-of-fireforming-cases[/URL] My cases I’m forming are new Starline 270 Win to 300 Sherman….So, I Annealed new Starline brass Expanded to 338 cal Ran through the FL die with bushing 0.002” under neck diameter. Sized until bolt would close with a moderate force. Too heavy for hunting or Benchrest. Anneal again Put clay in primer cavity. Filled with titegroup to just spilling over. Weighed that charge at 57.8gr. 1/10th was ~6 gr. Prime with large rifle primers Made ladder from 6 to 15gr in 1gr increments using Titegroup fill with 2 1/2 min Cream of Wheat to about 1/2 full neck Cap with 1” square of TP pressed in with a punch Shot the ladder. Results: 6-7 gr….CBTD not fully achieved. About 0.001” short; shoulder shape about 90% formed; case length 2.480” 7-10 gr….CBTD at max; shoulder shape not fully formed; Case length about 2.480” 11-15 gr….CBTD at max; shoulder shape 98% or better; case length varies 2.480” down to 2.474” at max I am making final loads at 11 gr. Otherwise recipe is same. Necks are 0.050” shorter than spec. I wonder how that will affect accuracy. I prefer the neck length were bullet diameter long. I think they will be short of that. Resulting case will be about 70-75gr h20, I think. I’ll measure today and share result. [/QUOTE]
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COW Fireforming recipe
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