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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
PSA 300 BLK upper, any good?
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<blockquote data-quote="QuietTexan" data-source="post: 2419319" data-attributes="member: 116181"><p>A small base die is just that - they size smaller further down towards the base of the case, and to slightly smaller overall dimensions. They're used for actions that don't have the benefit of leverage to close the chamber - ARs, semi-autos, pumps. The forward assist is the backup for failure to close because you can smack it and accomplish the same effect as a lever/bolt.</p><p></p><p>In a bolt action as the bolt closes and the lugs lock there is a compound camming action where the bolt moves forward very slightly to lock with the bolt acting as a lever to gain mechanical advantage. If the case web is slightly oversize it's not ideal, but also not as big a problem because the bolt can lever it into the chamber easier.</p><p></p><p>You're worried that everyone complains Lee isn't a "forming" die I'm guessing? In the original method of cut-size-trim there was a 4th step of resize down with a second, potentially better die. I said use a Lee die because you could get one for fifteen bucks and size down in two steps whereas a carbide Dillon was a hundred bucks plus.</p><p></p><p>Forming Process - My Old Poor Boy Method before I gave up and started buying 300 BLK brass because this sucked</p><ol> <li data-xf-list-type="ol">Cut down range brass with an angle grinder</li> <li data-xf-list-type="ol">Knock the burr off with a bench grinder</li> <li data-xf-list-type="ol">Form through a die <--- Buy a crappy Lee for here</li> <li data-xf-list-type="ol">Trim to length, chamfer, deburr - all by hand</li> <li data-xf-list-type="ol">Resize again in (Forster?) 300 Whisper die <--- Use any die here, SB or otherwise</li> <li data-xf-list-type="ol">Shoot, resize with the 300 Whisper die</li> </ol><p>[ATTACH=full]334602[/ATTACH]</p><p></p><p></p><p>But after seeing that jig and things changing for the better in the last ten years I would now probably do something like:</p><ol> <li data-xf-list-type="ol">Resize 223 case with RCBS small base 300 BLK die and put the second shoulder on the case (SB because the case won't grow longer on future sizings if you squeeze it down tight before cutting it)</li> <li data-xf-list-type="ol">Cut to very close to trim length with the jig and a little chop saw</li> <li data-xf-list-type="ol">Trim in the LCG-WFT on a drill</li> <li data-xf-list-type="ol">Probably will chamber in your AR</li> <li data-xf-list-type="ol">Resize with whatever die works going forward. Probably a regular FL die because I've never needed a SB die before.</li> </ol><p>[ATTACH=full]334604[/ATTACH]</p><p></p><p></p><p>It seemed like after Dillon came out with the trim die it was popular to use a 223 sizing die as the decapper up front, then use the power trimmer, but I didn't have Dillon money to actually try that out back then.</p><p></p><p></p><p>I've never tried to tighten up an AR. I've also never shot a high end service rifle competition type rifle that might be accurate enough to benefit from it. It's my understanding that the Accu-Wedge is snake oil, but I've never used one.</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2419319, member: 116181"] A small base die is just that - they size smaller further down towards the base of the case, and to slightly smaller overall dimensions. They're used for actions that don't have the benefit of leverage to close the chamber - ARs, semi-autos, pumps. The forward assist is the backup for failure to close because you can smack it and accomplish the same effect as a lever/bolt. In a bolt action as the bolt closes and the lugs lock there is a compound camming action where the bolt moves forward very slightly to lock with the bolt acting as a lever to gain mechanical advantage. If the case web is slightly oversize it's not ideal, but also not as big a problem because the bolt can lever it into the chamber easier. You're worried that everyone complains Lee isn't a "forming" die I'm guessing? In the original method of cut-size-trim there was a 4th step of resize down with a second, potentially better die. I said use a Lee die because you could get one for fifteen bucks and size down in two steps whereas a carbide Dillon was a hundred bucks plus. Forming Process - My Old Poor Boy Method before I gave up and started buying 300 BLK brass because this sucked [LIST=1] [*]Cut down range brass with an angle grinder [*]Knock the burr off with a bench grinder [*]Form through a die <--- Buy a crappy Lee for here [*]Trim to length, chamfer, deburr - all by hand [*]Resize again in (Forster?) 300 Whisper die <--- Use any die here, SB or otherwise [*]Shoot, resize with the 300 Whisper die [/LIST] [ATTACH type="full" width="276px" alt="300 BLK old.jpg"]334602[/ATTACH] But after seeing that jig and things changing for the better in the last ten years I would now probably do something like: [LIST=1] [*]Resize 223 case with RCBS small base 300 BLK die and put the second shoulder on the case (SB because the case won't grow longer on future sizings if you squeeze it down tight before cutting it) [*]Cut to very close to trim length with the jig and a little chop saw [*]Trim in the LCG-WFT on a drill [*]Probably will chamber in your AR [*]Resize with whatever die works going forward. Probably a regular FL die because I've never needed a SB die before. [/LIST] [ATTACH type="full" alt="300 blk new.jpg"]334604[/ATTACH] It seemed like after Dillon came out with the trim die it was popular to use a 223 sizing die as the decapper up front, then use the power trimmer, but I didn't have Dillon money to actually try that out back then. I've never tried to tighten up an AR. I've also never shot a high end service rifle competition type rifle that might be accurate enough to benefit from it. It's my understanding that the Accu-Wedge is snake oil, but I've never used one. [/QUOTE]
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AR15/10 Rifles
PSA 300 BLK upper, any good?
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