annealing temp
- Thread starter redneckturkeycaller
- Start date
The 5 lapua cases were annealed to a point where the neck and shoulders glowed a nice hot lava red, just like you see on the Discovery Channel! then water quenched.
Then loaded with 47 grains of varget and 155 gr SMK palma.
They were shot out of a 26" brux barrel, on a BP remy action.
Velocities were 2911 fps ave. These 5 shots from a cold bore off a bipod went into .713" C to C @ 100 yards. 4 of them clustered under .5".
This group was not quite as small as the previous un- annealed group 2 nights ago which was .505" That group was not a cold bore group.
I would need to repeat the test multiple times to actual discern an accuracy difference.
No pressure indicators were present on the case heads or primers.
This AM we resized the 5 over annealed cases, using 3 different dies.
a Lee fls, a Lee neck collet die, and a lyman fls.
No problems were encountered with sizing,
After sizing the neck, the OD measurment with a caliper was .336", squeezing with the caliper down to .330 and remeasuring the neck revealed that it sprung back to .336". Squeezing the caliper down to .325" on the brass neck and releasing showed spring back to .335".
Repeating this test with the pc of brass that went thru the neck collet die, which would be worked less than a fls die with expander, showed near identicle results as far as brass spring back.
So guys I will say this, one test with one cartrige is not a difinitive truth, Try some experimenting yourselves. So much info on the net is repeated to the point of becoming "fact" that it becomes unquestioned.
Then loaded with 47 grains of varget and 155 gr SMK palma.
They were shot out of a 26" brux barrel, on a BP remy action.
Velocities were 2911 fps ave. These 5 shots from a cold bore off a bipod went into .713" C to C @ 100 yards. 4 of them clustered under .5".
This group was not quite as small as the previous un- annealed group 2 nights ago which was .505" That group was not a cold bore group.
I would need to repeat the test multiple times to actual discern an accuracy difference.
No pressure indicators were present on the case heads or primers.
This AM we resized the 5 over annealed cases, using 3 different dies.
a Lee fls, a Lee neck collet die, and a lyman fls.
No problems were encountered with sizing,
After sizing the neck, the OD measurment with a caliper was .336", squeezing with the caliper down to .330 and remeasuring the neck revealed that it sprung back to .336". Squeezing the caliper down to .325" on the brass neck and releasing showed spring back to .335".
Repeating this test with the pc of brass that went thru the neck collet die, which would be worked less than a fls die with expander, showed near identicle results as far as brass spring back.
So guys I will say this, one test with one cartrige is not a difinitive truth, Try some experimenting yourselves. So much info on the net is repeated to the point of becoming "fact" that it becomes unquestioned.
bozo699
Gold $$ Contributor
Jim,
Thank you for a obviously very honest report that was in detail, I have been reloading for years but am just getting started into annealing, I find a report like this one much more informative then some of the 5 page reports that in the end says to hold case under flame 4-6 seconds, thanks.
Wayne.
Thank you for a obviously very honest report that was in detail, I have been reloading for years but am just getting started into annealing, I find a report like this one much more informative then some of the 5 page reports that in the end says to hold case under flame 4-6 seconds, thanks.
Wayne.
Jim See said:
"I read it on the INTERNET so it MUST be true!!"
What's undeniably true is that 50,000+ psi & gasses at 1,000°+F can hurt you.
Experiment with caution when you have your face mere inches from conditions like this. New brass, even new rifle actions will cost you some, but not nearly as much as rebuilding your face... if you survive an accident.
What's undeniably true is that 50,000+ psi & gasses at 1,000°+F can hurt you.
Experiment with caution when you have your face mere inches from conditions like this. New brass, even new rifle actions will cost you some, but not nearly as much as rebuilding your face... if you survive an accident.
[/quote]
Excellent point, IN NO CASE DURING THIS TEST, was there annealing discoloration below the cartriges midline, the alluminum fixture I use to hold and spin the cases protects this portion of the case from direct heat, and heat is applied for a very short duration and cases quikly dumped in water to prevent any heat transfer to the web/case head.
Proceed with care.
Experiment with caution when you have your face mere inches from conditions like this. New brass, even new rifle actions will cost you some, but not nearly as much as rebuilding your face... if you survive an accident.
[/quote]
Excellent point, IN NO CASE DURING THIS TEST, was there annealing discoloration below the cartriges midline, the alluminum fixture I use to hold and spin the cases protects this portion of the case from direct heat, and heat is applied for a very short duration and cases quikly dumped in water to prevent any heat transfer to the web/case head.
Proceed with care.
I remember watching a PC link on a UK forum showing how brass was made, I think it was Norma. It showed very briefly brass being annealed in one of the last lines of process, it positively glowed.
I have searched high and low to try and find the link but yeah you've guessed it, I can't!
Even though I have seen this particular video I'm still one of the followers of not going over 750F, I have to say though Jim See has opened my eyes a little bit.
I have searched high and low to try and find the link but yeah you've guessed it, I can't!
Even though I have seen this particular video I'm still one of the followers of not going over 750F, I have to say though Jim See has opened my eyes a little bit.
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