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
Reloading
Reloader 26 in 6.5 creedmoor
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="DMP25-06" data-source="post: 1445809" data-attributes="member: 27271"><p>Hello Bowfishn ,</p><p></p><p>I went to the range yesterday , 05-27-2018 , and ran velocity tests on 6.5 CM loads with Hornady 147 gr. ELD-M . Air temperature was 85 degrees F. , Elevation is 800' above sea level .</p><p>Results are as follows :</p><p> All velocities measured with a Magnetospeed V1</p><p></p><p>Hornady factory 147 gr. ELD-M ammo - 2707 FPS average , out of 28" barrel , factory Ruger M77 Hawkeye Heavy Varmint / Target rifle .</p><p></p><p>Test loadings of 147 gr. ELD-M bullets , Peterson brass , Fed. 215 Match primers , cartridge O.A.L. = 2.865" , Hodgdon H4350 powder are as follows , as per your Quickload chart that you posted for me with 51.0 gr. H2O capacity .</p><p></p><p>Results are as follows :</p><p>38.4 gr H4350 = 2480 fps</p><p>Skip to 39.0 gr. = 2522 fps</p><p>39.2 gr. = 2522 fps</p><p>39.4 gr. =2535 fps</p><p>39.6 gr. = 2573 fps</p><p>40.0 gr. = 2561 fps</p><p>40.8 gr = 2613 fps</p><p>continuing on at .2 gr. intervals , watching for pressure indicators , I reached your maximum posted loading of 42.2 gr. H4350 at 2704 fps .</p><p></p><p>No hard bolt lift on any of the cartridges fired , whether factory ammo , or hand loads .</p><p>No flattened primers , however ALL of the cartridges fired , both factory ammo and hand loads , have shown slight cratering of the primer , at the firing pin strike point , which is and has always been off-center on all cartridges fired in this rifle . Even the loadings that chronographed 2480 fps had this cratering of the primer . I think that perhaps the firing pin opening in the bolt face may be slightly enlarged ( This occurred on a Rem. Model 700 , on a different occasion , and changing the bolt remedied that situation ) , although I have not measured the opening , to compare it to my other Ruger M77 , in .220 Swift chambering , which has never shown any cases with cratered primers .</p><p></p><p>I measured the dimensions of the brass , after having been fired , and those measurements are as follows :</p><p>Hornady brass New loaded cartridge :</p><p>Base diameter = .468"</p><p>Case body / shoulder junction = .457"</p><p>Case body above extractor groove = .467"</p><p>Neck diameter = .292"</p><p></p><p>Hornady cases after firing :</p><p>Base diameter =.468"</p><p>Diameter at cartridge body/ shoulder junction = .4645"</p><p>Diameter at case body above extractor groove = .4705"</p><p>Neck diameter = .297"</p><p></p><p>Peterson brass cases after firing :</p><p>Base diameter = .468"</p><p>Diameter at cartridge body / shoulder junction = .4645"</p><p>Diameter at case body above extractor groove = .471"</p><p>Neck diameter = .297"</p><p></p><p>Are these dimensions somewhat larger than normal chamber dimension specifications ?</p><p>Also , ALL fired cases are not perfectly round at the case body ,measuring slightly ellliptical , at .470" - .471"when turning them inside the jaws of my calipers .</p><p></p><p>I cleaned as much powder residue as possible from inside a fired Peterson cartridge case and then weighed it , which showed to be 175.2 gr. empty weight , and then filled with water to measure the volume of the fired case . Filled with water , it weighed 226.8 gr. , showing a fill volume of 51.6 gr H2O .</p><p>Would Neck-sizing only make any difference in SAFE volume of powder loaded into these cases , in hopes of somewhat higher velocity ?</p><p></p><p>Final question : could the Magnetospeed be incorrect ? Although the measured velocities for my .308 Win. , when entered into my Sig Kilo 2400 , are normally very close on the MOA of bullet drop shown for various ranges .</p><p></p><p>As always , thank you for your help , and any recommendations that you might offer .</p><p>DMP25-06</p></blockquote><p></p>
[QUOTE="DMP25-06, post: 1445809, member: 27271"] Hello Bowfishn , I went to the range yesterday , 05-27-2018 , and ran velocity tests on 6.5 CM loads with Hornady 147 gr. ELD-M . Air temperature was 85 degrees F. , Elevation is 800' above sea level . Results are as follows : All velocities measured with a Magnetospeed V1 Hornady factory 147 gr. ELD-M ammo - 2707 FPS average , out of 28" barrel , factory Ruger M77 Hawkeye Heavy Varmint / Target rifle . Test loadings of 147 gr. ELD-M bullets , Peterson brass , Fed. 215 Match primers , cartridge O.A.L. = 2.865" , Hodgdon H4350 powder are as follows , as per your Quickload chart that you posted for me with 51.0 gr. H2O capacity . Results are as follows : 38.4 gr H4350 = 2480 fps Skip to 39.0 gr. = 2522 fps 39.2 gr. = 2522 fps 39.4 gr. =2535 fps 39.6 gr. = 2573 fps 40.0 gr. = 2561 fps 40.8 gr = 2613 fps continuing on at .2 gr. intervals , watching for pressure indicators , I reached your maximum posted loading of 42.2 gr. H4350 at 2704 fps . No hard bolt lift on any of the cartridges fired , whether factory ammo , or hand loads . No flattened primers , however ALL of the cartridges fired , both factory ammo and hand loads , have shown slight cratering of the primer , at the firing pin strike point , which is and has always been off-center on all cartridges fired in this rifle . Even the loadings that chronographed 2480 fps had this cratering of the primer . I think that perhaps the firing pin opening in the bolt face may be slightly enlarged ( This occurred on a Rem. Model 700 , on a different occasion , and changing the bolt remedied that situation ) , although I have not measured the opening , to compare it to my other Ruger M77 , in .220 Swift chambering , which has never shown any cases with cratered primers . I measured the dimensions of the brass , after having been fired , and those measurements are as follows : Hornady brass New loaded cartridge : Base diameter = .468" Case body / shoulder junction = .457" Case body above extractor groove = .467" Neck diameter = .292" Hornady cases after firing : Base diameter =.468" Diameter at cartridge body/ shoulder junction = .4645" Diameter at case body above extractor groove = .4705" Neck diameter = .297" Peterson brass cases after firing : Base diameter = .468" Diameter at cartridge body / shoulder junction = .4645" Diameter at case body above extractor groove = .471" Neck diameter = .297" Are these dimensions somewhat larger than normal chamber dimension specifications ? Also , ALL fired cases are not perfectly round at the case body ,measuring slightly ellliptical , at .470" - .471"when turning them inside the jaws of my calipers . I cleaned as much powder residue as possible from inside a fired Peterson cartridge case and then weighed it , which showed to be 175.2 gr. empty weight , and then filled with water to measure the volume of the fired case . Filled with water , it weighed 226.8 gr. , showing a fill volume of 51.6 gr H2O . Would Neck-sizing only make any difference in SAFE volume of powder loaded into these cases , in hopes of somewhat higher velocity ? Final question : could the Magnetospeed be incorrect ? Although the measured velocities for my .308 Win. , when entered into my Sig Kilo 2400 , are normally very close on the MOA of bullet drop shown for various ranges . As always , thank you for your help , and any recommendations that you might offer . DMP25-06 [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Reloader 26 in 6.5 creedmoor
Top