Hello,
Had a problem with high pressure and don't know the cause.
This is a hunting gun. Rem 700 in 260 Remington with a Bartlein 1x8" barrel. It was chambered with a reamer made for my case and bullet combo. Bullet is jumping about .030".
I had a shell blow out the primer and I felt gas on my face when I fired . VERY hard to open the action.Had to remove the bolt to get the shell off the bolt face and primer fell on the floor. 260 rem, 125gr nosler partition (blem), federal case been fired three times, 38gr of IMR 4064, WLR primer. Load has never shown pressure, I had loaded 60 (at one time) of these last year for hunting and shot all of them but 5 or 6.
measurements of high pressure case.
case web .471"
case rim .4755"
case length 2.035
measurements of same load fired case without pressure signs
case web .470"
case rim .471
case length .2.029
measurements of a loaded case
case web .469"
case rim .471
case length 2.032"
No chance of wrong powder or bullet. All charges weighed on RCBS beam scale.
39.3gr is what I consider max load in this gun.
Cases are cleaned with acetone then tumbled after sizing.
Shell was in the magazine when gun was fired 3 times, thought bullet may have slid out the neck.
I tried to make bullet slide out the neck by closing the action HARD ten times on one loaded shell. It didn't move, slim
I don't remember if the action was hard to close or not?
Need to get the reamer print and see if case is to long and clamped down on the bullet ?
Have not fired the gun since.
I'm at a loss , no real idea what happened.
My only problem like this in over 40 years of reloading and it scared me.
Robert
Had a problem with high pressure and don't know the cause.
This is a hunting gun. Rem 700 in 260 Remington with a Bartlein 1x8" barrel. It was chambered with a reamer made for my case and bullet combo. Bullet is jumping about .030".
I had a shell blow out the primer and I felt gas on my face when I fired . VERY hard to open the action.Had to remove the bolt to get the shell off the bolt face and primer fell on the floor. 260 rem, 125gr nosler partition (blem), federal case been fired three times, 38gr of IMR 4064, WLR primer. Load has never shown pressure, I had loaded 60 (at one time) of these last year for hunting and shot all of them but 5 or 6.
measurements of high pressure case.
case web .471"
case rim .4755"
case length 2.035
measurements of same load fired case without pressure signs
case web .470"
case rim .471
case length .2.029
measurements of a loaded case
case web .469"
case rim .471
case length 2.032"
No chance of wrong powder or bullet. All charges weighed on RCBS beam scale.
39.3gr is what I consider max load in this gun.
Cases are cleaned with acetone then tumbled after sizing.
Shell was in the magazine when gun was fired 3 times, thought bullet may have slid out the neck.
I tried to make bullet slide out the neck by closing the action HARD ten times on one loaded shell. It didn't move, slim
chance bullet was in the lands.
It was raining that day but I carried the gun muzzle down to a covered box stand.I don't remember if the action was hard to close or not?
Need to get the reamer print and see if case is to long and clamped down on the bullet ?
Have not fired the gun since.
I'm at a loss , no real idea what happened.
My only problem like this in over 40 years of reloading and it scared me.
Robert