Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Gunsmithing
Savage M12 LRP Chamber
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="hybridspecies" data-source="post: 2257253" data-attributes="member: 119219"><p>I get different headspace readings depending on whether I use the Hornady or Sinclair comparator so I'm not sure how meaningful the actual measurements are with respect to accurately determining headspace (datum position is different for each I believe). Besides that I'm sure the primer is adding to the length. I'll deprime a couple cases with a universal decapping die and remeasure.</p><p></p><p>Here are some photos of the cases at 40.4 gr, 41 gr, 41.5 gn, and 42 grains (they are all single fired brass):</p><p></p><p>40.4 grains H4350 (cratering and flattened primer)</p><p>[ATTACH=full]289979[/ATTACH]</p><p></p><p>41 grains H4350 (cratering, flattened primer, and ejector wipe on the "C" in Creedmoor)</p><p>[ATTACH=full]289980[/ATTACH]</p><p></p><p>41.5 grains H4350 (cratering, primer flattening, ejector wipe, and the start of an ejector ring around the second "A" in Lapua)</p><p>[ATTACH=full]289985[/ATTACH]</p><p></p><p>42 grains H4350 (cratering, primer flattening, significant ejector wipe, pronounced ejector ring)</p><p>[ATTACH=full]289989[/ATTACH]</p><p></p><p>Also of note is that the bolt face was filthy. It arrive new with significant carbon buildup around the inner edges (presumably from test firing at the factory), but significant discoloring/buildup occurred around the primer contact area after putting the 101 rounds through it. Here are a couple of photos before cleaning and after cleaning. I don't know if the firing pin hole is oversized, but the machining of the bolt face looks horrible in my opinion. Additionally there seems to be a groove around the primer contact area on the bolt face, although it's hard to know for sure if that was there initially because of the circular machining marks across the entire bolt face:</p><p></p><p>Dirty:</p><p>[ATTACH=full]289990[/ATTACH]</p><p></p><p>After Cleaning:</p><p>[ATTACH=full]289991[/ATTACH]</p><p></p><p>Thanks for your help.</p></blockquote><p></p>
[QUOTE="hybridspecies, post: 2257253, member: 119219"] I get different headspace readings depending on whether I use the Hornady or Sinclair comparator so I'm not sure how meaningful the actual measurements are with respect to accurately determining headspace (datum position is different for each I believe). Besides that I'm sure the primer is adding to the length. I'll deprime a couple cases with a universal decapping die and remeasure. Here are some photos of the cases at 40.4 gr, 41 gr, 41.5 gn, and 42 grains (they are all single fired brass): 40.4 grains H4350 (cratering and flattened primer) [ATTACH type="full"]289979[/ATTACH] 41 grains H4350 (cratering, flattened primer, and ejector wipe on the "C" in Creedmoor) [ATTACH type="full"]289980[/ATTACH] 41.5 grains H4350 (cratering, primer flattening, ejector wipe, and the start of an ejector ring around the second "A" in Lapua) [ATTACH type="full"]289985[/ATTACH] 42 grains H4350 (cratering, primer flattening, significant ejector wipe, pronounced ejector ring) [ATTACH type="full"]289989[/ATTACH] Also of note is that the bolt face was filthy. It arrive new with significant carbon buildup around the inner edges (presumably from test firing at the factory), but significant discoloring/buildup occurred around the primer contact area after putting the 101 rounds through it. Here are a couple of photos before cleaning and after cleaning. I don't know if the firing pin hole is oversized, but the machining of the bolt face looks horrible in my opinion. Additionally there seems to be a groove around the primer contact area on the bolt face, although it's hard to know for sure if that was there initially because of the circular machining marks across the entire bolt face: Dirty: [ATTACH type="full"]289990[/ATTACH] After Cleaning: [ATTACH type="full"]289991[/ATTACH] Thanks for your help. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Gunsmithing
Savage M12 LRP Chamber
Top