Excessive pressure Howa 1500 after recall

staffordshires2

staffordshires2

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Hi all, I am wondering since the bolt recall on the 1500 my loads are showing excessive pressure? My primers are getting flattened out. I had a load developed for my S&W 1500 .270, and have hundreds of rounds made up, but I am now thinking I have to pull them all and start this process all over.. anyone know why or what would cause this, or had this happen? I was thinking headspace, I checked last last night and it seems good, and freebore isn't an issue, since there is no way the bullet can reach the rifeling, upon loading. thanks for any insight on this issue..
 
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Ganderite said:
The only surrogate for pressure is velocity. Use a chony to find out if velocity is excessive.

I can't think of anything the factory could do to your bolt that would increase pressure.
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Excessive pressure can caused by alot of different factors; wrong powder, wrong charge weight, not enough headspace resulting of crimping your case to the lead, not enough freebore where your bullet is jammed into the rifeling etc..thanks for your insight.
 
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Is the OP using ammo made for a different rifle (S&W 1500) in the Howa 1500?, the chambers may not be the same,and may be causing the pressure issue.( even though they may have been made by the same manufacturer)
If its the same rifle he made the rounds up for, I have no answer.
 
flyr said:
Is the OP using ammo made for a different rifle (S&W 1500) in the Howa 1500?, the chambers may not be the same,and may be causing the pressure issue.( even though they may have been made by the same manufacturer)
If its the same rifle he made the rounds up for, I have no answer.
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This ammo is fire formed, just neck sized for this particular rifle.
 
If the headspace increased the primers can back out further and become flatter at the same pressure.

If the headspace is tighter your old OAL might be causing a increase in pressure if close to jam.

Was the recall a heaspace issue?

Do your loaded rounds chamber without bolt closing resistance?

Are these once fired cases from a different rifle and sized for the old rifle?
 
The recall was to do with the bolt sleeve being changed I think.
Seems like the rounds chamber without issue.
These cases are all from the rifle in question, and are just neck sized.
Thanks for your insight bigedp51.
 
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Sounds like a pretty skookum load, Hodgdon lists 54.0grs Max with a 140gr bullet, 53.0grs with 150gr. Nosler doesn't list IMR 4831 but they do list a 150gr load with Hodgdon H4831 which is slower burning than IMR, their max load 55.0grs

If you can chronograph your load, it will tell a lot of the pressure of the load. If the speed is over 2850 fps (22" barrel), 2900 fps (24" barrel) with IMR 4831, it's coming at the expensive of too much chamber pressure
 
Are your sure that you got the same bolt as you sent. Mistakes can happen. If not then headspace could be an issue and flat primers as a result. Check the serial #'s to make sure. Just saying
 
If the headspace shortened his "neck sized" loads would not fit anymore, also changing the bolt sleeve would have no relationship to the bolt lugs.
Are these cases only fired 1 time from new, and this is the first time shooting the neck sized loads?
 
Hitzy said:
If the headspace shortened his "neck sized" loads would not fit anymore, also changing the bolt sleeve would have no relationship to the bolt lugs.
Are these cases only fired 1 time from new, and this is the first time shooting the neck sized loads?
Click to expand...

Thank you, as doing more inspection, you are correct. I took my bolt apart today to see if this recall would cause any changes in the chamber.. it won't change a thing.. maybe I just had some cases that had a smaller volume , since I am running .1gr over max charge per the hornady reloading manual.. thus causing the higher pressures.. thanks everyone..
 
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