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Tennessee Gun Owners Forums
Reloading
7mm PRC Optimal powder charge help... update... I give up!!!!
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<blockquote data-quote="megalomaniac" data-source="post: 5873321" data-attributes="member: 2805"><p>Went to the range to shoot for powder charge for the 180 match and 190g match bullets...</p><p></p><p>First shot with the 150nbt's I loaded up for bbl break in.</p><p></p><p>Started at the bottom end of the ladder with the 180s (2g under book max) and immediately had pressure signs with heavy ejector marks, velocity 2650 fps.</p><p></p><p>Switched to the 190s and the third round (1.7g under book max) had heavy pressure signs. velocity 2650 fps.</p><p></p><p>Just ridiculous... I can get these velocities with 175s out of a .308</p><p></p><p>For kicks and giggles, I brought my 175 eldx's that I had worked up to 2800 fps earlier to shoot at 300 and 500y. Welp, first shot, 2800 fps, VERY sticky bolt lift, crazy ejector marks, case ruined.</p><p></p><p>I'm thinking something is out of spec with the chamber from the factory.... like maybe the end of the brass at the neck is contacting the end of the chamber pinching the bullet. Brass was trimmed to factory trim length before each firing, so it isn't my brass stretching and me forgetting to trim.</p><p></p><p>Heavy carbon build up at the throat could possibly cause this... but this rifle only has 70 rounds down it or so...</p><p></p><p>Any other thoughts???</p><p></p><p>Never had anything like this before, which is why I'm considering it's a chamber out of spec....</p><p></p><p>Got 2 boxes factory ammo on order (pains me to do so... I haven't bought any factory ammo in 30 years). If they do the same thing, rifle is going back to manufacturer. If they give me 2950fps w/o pressure, then obviously I'm doing something WAY wrong and I'll have to suck it up and shoot factory ammo</p></blockquote><p></p>
[QUOTE="megalomaniac, post: 5873321, member: 2805"] Went to the range to shoot for powder charge for the 180 match and 190g match bullets... First shot with the 150nbt's I loaded up for bbl break in. Started at the bottom end of the ladder with the 180s (2g under book max) and immediately had pressure signs with heavy ejector marks, velocity 2650 fps. Switched to the 190s and the third round (1.7g under book max) had heavy pressure signs. velocity 2650 fps. Just ridiculous... I can get these velocities with 175s out of a .308 For kicks and giggles, I brought my 175 eldx's that I had worked up to 2800 fps earlier to shoot at 300 and 500y. Welp, first shot, 2800 fps, VERY sticky bolt lift, crazy ejector marks, case ruined. I'm thinking something is out of spec with the chamber from the factory.... like maybe the end of the brass at the neck is contacting the end of the chamber pinching the bullet. Brass was trimmed to factory trim length before each firing, so it isn't my brass stretching and me forgetting to trim. Heavy carbon build up at the throat could possibly cause this... but this rifle only has 70 rounds down it or so... Any other thoughts??? Never had anything like this before, which is why I'm considering it's a chamber out of spec.... Got 2 boxes factory ammo on order (pains me to do so... I haven't bought any factory ammo in 30 years). If they do the same thing, rifle is going back to manufacturer. If they give me 2950fps w/o pressure, then obviously I'm doing something WAY wrong and I'll have to suck it up and shoot factory ammo [/QUOTE]
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Tennessee Gun Owners Forums
Reloading
7mm PRC Optimal powder charge help... update... I give up!!!!
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