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
Need help way way over pressure on near minimum powder
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="AZlongrangehunting" data-source="post: 1572946" data-attributes="member: 108551"><p>Hey guys... I'm looking for some help or ideas as to what is causing a massive over pressure in my new loads... 7mmRM</p><p>Symptoms brass into extractor flow</p><p>Head of the brass stamp reddish tinge and scoring from bolt face when lifting bolt</p><p>Obviously extremely difficult to remove from chamber</p><p>Oh...... And primers were blasted out of the pocket completely on all 3</p><p></p><p>To start this is virgin norma brass all I did was use a flash hole uniformer brass was perfect all around so I did nothing else to it.</p><p>Powder which is new to me is H1000</p><p>Bullet new to me is 175.00 gr weight sorted</p><p>All of my data shows about 61-61.5gr h1000 to 64.5 do not exceed.</p><p>I did the jam method for new brass as I didnt have any fired for modified aka using the brass expanded inserted a bullet and chambered it to get my approximate max ogive length</p><p>My goal was to reach at least .020" off the lands for new brass</p><p></p><p>My starting gr was 2 cartridges @62gr... and I pulled one from a second batch that i did this morning same 62gr all the same symptoms all the same everything depth etc.</p><p></p><p>I re checked my charge master lite scale with a known bullet of 175.0gr and it was dead on</p><p></p><p>I removed ALL kernels from previous powder and even if that were the case the second batch (25 charges later) would have been absolutely cleared.....</p><p>I took one of the fired cases and made a modified case to attempt to check max ogive... and it showed I was .042" off the lands... I dont trust this entirely as the brass is likely over stretched... but even then if so the .042 should account for extra brass stretch?</p><p></p><p>My first thought was I must have seated them too long but i didnt notice them jamming or feel it into the lands at all</p><p>So i checked another that was unfired to see if i had land marks on the bullet seated at that depth using a marker and I think faintly I am seated into the lands I'm pretty sure my suspicion is right here... also I have modified cases for hornady federal Winchester and rem... some are the same max ogive and nearly all the same so I'm assuming this is definitely my problem</p><p></p><p>This is a factory action and barrel savage 111</p><p></p><p>Fortunately or unfortunately the results were good... I just hope it performs like this with safe pressures [ATTACH=full]122172[/ATTACH] [ATTACH=full]122173[/ATTACH]</p></blockquote><p></p>
[QUOTE="AZlongrangehunting, post: 1572946, member: 108551"] Hey guys... I'm looking for some help or ideas as to what is causing a massive over pressure in my new loads... 7mmRM Symptoms brass into extractor flow Head of the brass stamp reddish tinge and scoring from bolt face when lifting bolt Obviously extremely difficult to remove from chamber Oh...... And primers were blasted out of the pocket completely on all 3 To start this is virgin norma brass all I did was use a flash hole uniformer brass was perfect all around so I did nothing else to it. Powder which is new to me is H1000 Bullet new to me is 175.00 gr weight sorted All of my data shows about 61-61.5gr h1000 to 64.5 do not exceed. I did the jam method for new brass as I didnt have any fired for modified aka using the brass expanded inserted a bullet and chambered it to get my approximate max ogive length My goal was to reach at least .020" off the lands for new brass My starting gr was 2 cartridges @62gr... and I pulled one from a second batch that i did this morning same 62gr all the same symptoms all the same everything depth etc. I re checked my charge master lite scale with a known bullet of 175.0gr and it was dead on I removed ALL kernels from previous powder and even if that were the case the second batch (25 charges later) would have been absolutely cleared..... I took one of the fired cases and made a modified case to attempt to check max ogive... and it showed I was .042" off the lands... I dont trust this entirely as the brass is likely over stretched... but even then if so the .042 should account for extra brass stretch? My first thought was I must have seated them too long but i didnt notice them jamming or feel it into the lands at all So i checked another that was unfired to see if i had land marks on the bullet seated at that depth using a marker and I think faintly I am seated into the lands I'm pretty sure my suspicion is right here... also I have modified cases for hornady federal Winchester and rem... some are the same max ogive and nearly all the same so I'm assuming this is definitely my problem This is a factory action and barrel savage 111 Fortunately or unfortunately the results were good... I just hope it performs like this with safe pressures [ATTACH=full]122172[/ATTACH] [ATTACH=full]122173[/ATTACH] [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Need help way way over pressure on near minimum powder
Top