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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
The PRC die "problem"
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<blockquote data-quote="garyatlp" data-source="post: 2716505" data-attributes="member: 91236"><p>Thanks for the response.</p><p>I had taken a shortcut in my low budget methodology for locating where the bullet hits the lands and I was wrong. Rechecked and OAL with a Hornady 147 is 2.990". That would be jammed into the rifling a little bit so bullet is contacting rifling at a slightly shorter length. So it seems the throat is longer than I initially thought. After further neck measurements I concluded I have at least .004" clearance, I found once I pushed a bullet into a fired case past the mouth of the neck it was then loose, the mouth of the neck was springing back more than the rest. I found an 6.5 PRC article from 2019 in Rifle Shooter Magazine by John Barsness "Bullets should fit easily into fired necks, but some revealed a little tightness right at the mouth of the case, indicating the case mouths had probably been "crimped" slightly by the front end of the chamber....Trimming the tight case mouths slightly allowed all five bullets to slip easily into the necks. Experimentation eventually revealed a trim length of 2.010 inches solved the problem". Don't know yet if this is the same as my issue.</p><p>However the expansion at the web is still .002". So unfired is .529 and after firing is .531 (accuracy of the actual reading is only .001" however the .002" difference before fired and new is spot on). Pulled bullets and reseated .110" longer which moved boattail juncture from shoulder area to base of neck, should have dropped pressure some but web expansion is unchanged. Generally with my reloads if Im getting .0005" expansion here I'm thinking the load is close to 60,000 psi . Just starting out with this cartridge so time will tell. I should have researched the cartidge more. Who would expect a factory cartidge to have issues with chamber/brass/die compatibility?</p><p>Attached a picture of the 143 gt compared to 147 eldm, Norma has a hunting bullet, 143 Bondstrike with a .629 bc but I know nothing about suitibility for long range.</p></blockquote><p></p>
[QUOTE="garyatlp, post: 2716505, member: 91236"] Thanks for the response. I had taken a shortcut in my low budget methodology for locating where the bullet hits the lands and I was wrong. Rechecked and OAL with a Hornady 147 is 2.990". That would be jammed into the rifling a little bit so bullet is contacting rifling at a slightly shorter length. So it seems the throat is longer than I initially thought. After further neck measurements I concluded I have at least .004" clearance, I found once I pushed a bullet into a fired case past the mouth of the neck it was then loose, the mouth of the neck was springing back more than the rest. I found an 6.5 PRC article from 2019 in Rifle Shooter Magazine by John Barsness "Bullets should fit easily into fired necks, but some revealed a little tightness right at the mouth of the case, indicating the case mouths had probably been "crimped" slightly by the front end of the chamber....Trimming the tight case mouths slightly allowed all five bullets to slip easily into the necks. Experimentation eventually revealed a trim length of 2.010 inches solved the problem". Don't know yet if this is the same as my issue. However the expansion at the web is still .002". So unfired is .529 and after firing is .531 (accuracy of the actual reading is only .001" however the .002" difference before fired and new is spot on). Pulled bullets and reseated .110" longer which moved boattail juncture from shoulder area to base of neck, should have dropped pressure some but web expansion is unchanged. Generally with my reloads if Im getting .0005" expansion here I'm thinking the load is close to 60,000 psi . Just starting out with this cartridge so time will tell. I should have researched the cartidge more. Who would expect a factory cartidge to have issues with chamber/brass/die compatibility? Attached a picture of the 143 gt compared to 147 eldm, Norma has a hunting bullet, 143 Bondstrike with a .629 bc but I know nothing about suitibility for long range. [/QUOTE]
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The PRC die "problem"
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