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The Range
Ammo & Reloading
Trimming for 38 Special
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<blockquote data-quote="KurtM" data-source="post: 3789505" data-attributes="member: 6064"><p>Well, with all that in mind ...... Set back is not the problem with revolvers. Bullets moving forward sure is, that's why the heavy roll crimp. Now thick wall cases like a 357 (diameter to brass thickness) you can get away with not much crimp, or in some cases no crimp, but I dare you to try to not crimp large caliber heavy bullets, especially thin wall cases like 45 Colt, and even 44 SPL. Especially when loaded near max. 44 magnum will pull bullets and tie up the pistol fairly quickly, so will 41 mag with 220 gr bullets. There is no way not to crimp in a 475 Linebaugh. 454 Casul, 500 S&W. Matter of fact if you Chrono big caliber, heavy bullet, max loads, you will notice the first and last shot velocity will change a bunch as the crimps loosen due to inertia pulling of bullets.</p><p>Now I'll tell you right now I have never trimmed a straight wall case, but I do sort brass by manufacturer for heavy stuff so there isn't much length difference so the crimp is fairly consistent. If a bullet has a crimp groove you will never hurt accuracy by crimping into it. Go to far and you deform the bullet and accuracy could suffer.</p></blockquote><p></p>
[QUOTE="KurtM, post: 3789505, member: 6064"] Well, with all that in mind ...... Set back is not the problem with revolvers. Bullets moving forward sure is, that's why the heavy roll crimp. Now thick wall cases like a 357 (diameter to brass thickness) you can get away with not much crimp, or in some cases no crimp, but I dare you to try to not crimp large caliber heavy bullets, especially thin wall cases like 45 Colt, and even 44 SPL. Especially when loaded near max. 44 magnum will pull bullets and tie up the pistol fairly quickly, so will 41 mag with 220 gr bullets. There is no way not to crimp in a 475 Linebaugh. 454 Casul, 500 S&W. Matter of fact if you Chrono big caliber, heavy bullet, max loads, you will notice the first and last shot velocity will change a bunch as the crimps loosen due to inertia pulling of bullets. Now I'll tell you right now I have never trimmed a straight wall case, but I do sort brass by manufacturer for heavy stuff so there isn't much length difference so the crimp is fairly consistent. If a bullet has a crimp groove you will never hurt accuracy by crimping into it. Go to far and you deform the bullet and accuracy could suffer. [/QUOTE]
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