I have a Remington 700 7SAUM,last year I worked up a load with H4350 and the 140TSX that was extremely accurate.This year I duplicated the load using a new bag of Remington brass(the only supplier for this calibre),and immediately got a sticky bolt and moderate case pressure signs.The load is max from the Nosler #6 manual,but I had the same result with lighter loads in H4350 and other powders.As nothing has changed with the rifle I suspect the new brass.Any thought?I could look for another lot of Remington brass or neck down Norma 300SAUM brass.Whaddya think, Mur
New brass-sticky bolt?
- Thread starter Mur
- Start date
Weigh a sample of the brass from your old lot and from the new lot [without primer] If the new lot is more than 10 grains heavier [per case] than the old, and you are using a working max load, this could be the issue.
The other possibility is a "soft" lot of brass, that reacts to pressure more than does a "harder" lot.
Do not continue to use any load that diplays obvious pressure signs such as you mentioned. Regards, Eagleye.
The other possibility is a "soft" lot of brass, that reacts to pressure more than does a "harder" lot.
Do not continue to use any load that diplays obvious pressure signs such as you mentioned. Regards, Eagleye.
Unfortunately I no longer have the old brass to compare!I did weigh the new brass and found a 2.6 Gr variancefrom heaviest to lightest.I'll be throwing away the heaviest and lightest,and working up the middleweights.Don't worry Eagleye I won't be pulling the trigger on any max loads until I get this figured out! Mur
Any time you change components you should work back up to max. Brass can be different hardness, different internal capacity etc. Even powders can change from lot to lot. Believe it! If you are shooting max loads, always back off when you introduce new components to the mix.
I had a very bad experience one time shooting .308 win with 110 grain V max bullets pushed up to max velocity. GREAT coyote load but when I switched to different brass I had extreme overpressure and blew a primer. It really woke me up and I have been very careful ever since. I still have all my fingers thanks to the gods of Mauser.
I had a very bad experience one time shooting .308 win with 110 grain V max bullets pushed up to max velocity. GREAT coyote load but when I switched to different brass I had extreme overpressure and blew a primer. It really woke me up and I have been very careful ever since. I still have all my fingers thanks to the gods of Mauser.
Be aware, all the new ultra short type magnum cartridges are having problems, the case doesn't have enough surface area to grip the chamber walls compared to older type cartridges. If "ANY" grease, oil or resizing lubrication is on the case or in the chamber excessively high bolt thrust will result.
If you left any bore cleaner in the chamber or put any type "super Lube" on the rifle that is slipperier than snot on a door knob you need to clean and degrease your chamber.
"ANY" oil or grease on the cartridge will double the force on the bolt face which can damage any firearm.
Below, the effects of excess bolt thrust.
Or your brass might be too soft, defective, heat treating, etc.
If you left any bore cleaner in the chamber or put any type "super Lube" on the rifle that is slipperier than snot on a door knob you need to clean and degrease your chamber.
"ANY" oil or grease on the cartridge will double the force on the bolt face which can damage any firearm.
Below, the effects of excess bolt thrust.
Or your brass might be too soft, defective, heat treating, etc.
BigedP51 I "may" have not wiped my cases down well enough after sizing.After all,I'm 60 now,which is really no excuse!That may not be the problem,but both my newly loaded rounds and my chamber have been degreased.I'll start at 52grains and work up to max(59),and see how it goes.That could be the problem,as it was occuring with different bullets and powders.The local smith told me I had a "tight chamber" and pressure spikes were not uncommon with Barnes bullets,but that load shot fine last year,and I was getting pressure with Noslers too.Thanks,Mur
Mur
I'm 60 also and I once forgot and left oil in the chamber and damaged a rifle, if 60 people read my posting the world will be a more informed place.
Also we have people in forums telling everyone to lube their cases to fireform them and even oil the cases for normal loads to keep the cases from stretching in the web area.
97% of all errors are human errors and only 3% are actual mechanical failures.
I'm 60 also and I once forgot and left oil in the chamber and damaged a rifle, if 60 people read my posting the world will be a more informed place.
Also we have people in forums telling everyone to lube their cases to fireform them and even oil the cases for normal loads to keep the cases from stretching in the web area.
97% of all errors are human errors and only 3% are actual mechanical failures.
biged,I fireform for the .280AI,22-250AI,and 25-06AI,thankfully no one has reccomended that I lube the cases for fireforming,which I would not do in any case.You are quite right,there is a lot of information out there on the web,some of which can cause severe damage to your rifle!You have to seperate the wheat from the chaff.Thanks again,Mur
