AZlongrangehunting
Well-Known Member
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
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