New Sendero

[SuicidJky]

I finally broke down and bought a new gun. It's a model 700 sendero

[Gotcha!]

Not the extractor - it's an ejector hole mark, and, combined with the shaving of brass, indicates to me you are playing with pressure problems. You didn't say what bullet you are shooting or where it is seated, but something is causing high pressure.

However, I have witnesses that I know nothing, and it is your gun and life.

[Brithunter]

Doh........... the max load is only the max load in that particular pressure barrel or rifle which was actually used to work up the data. It does not mean it's the max load for every barrel and gun out there. Obviously some folks still don't get it

There is a reason for starting loads but not obviously meant for you!

[fabsroman]

Have you been using the same brass for all the loads, with the exception of the once fired brass? It might be a problem with the brass. Exactly how that could be, I have no idea, but I tend to use the process of elimination when dealing with problems. Maybe try a powder other than IMR 4831.

[Gotcha!]

Originally posted by SuicidJky
ya your right, going down to the lowest can't be the right place to start, and there test rifle being a model 700 with a 24 inch barrel and a 1-9.25 isn't remotely close to my sendero's 1-9.25 twist 24 inch barrel. I loaded some 139's down to 50 grains, which should be in the neighbourhood of 2400fps, with new brass....the marks were still there...looking exactly like the rest of them. with once fired brass they were gone and the base looked flat and like any normal case.

With this additional info I suspect the NEW brass is too short for your chamber, and it is being SLAMMED into the bolt face, The lack of marks on reloads in once fired means you now have the brass fireformed and everything is working as it should. Work forward from the once fired stuff.

[Brithunter]

Ok we have to explain it again just because they used the same model rifle means diddly squat it was not your particular rifle was it? No two barrels and chambers are exactly the same which is why we work up loads. One thing I am glad of is that I am never ............ ever likely to be shooting anywhere near you at any time. With an attitude like this you are not safe in my opinion .

[fabsroman]

Glad to see that we have found the problem and glad to see that this didn't turn into a flame fest.

However, it does suck that you have to fire form all your brass. Then again, it means more shooting. Kind of a good thing/bad thing.

[fabsroman]

I think that would be good enough for me too.

[Brithunter]

Hmmm so you now know exactly what the problem is.................. Good but let's face it the rifle should not be doing this there is something not right here, very not right and I would be getting it sorted out pronto.

Oh yes differences in barrels and chambers can .......... can make a huge difference. I had a sporterised P-14 done by Century arms which had a chamber soooooooooooooo tight that no dies could resize a case to fit it. We tired 4 dies sets from 3 different makers In the end I had it re-chambered for .303 Improved Of course with this tight chamber pressures climbed quicker than a normal chamber. The other P-14 from century we had was fine and these had new barrels with 6 groove rifling fitted by Century.

[BILLY D.]

hey jockey

how did you and how are you sizing the brass?

meaning, how did you size the cases the first time they were fired? also how did you arrive at an overall cartridge length? if the bullet is jammed into the lands you very well will show pressure signs. did you resize the brass and check overall case length?

i know, lots of questions but lots of things can add up to why the problems.

i tend to go with gotcha and brit about the over pressure theory. but just what is causing the pressure is up for conjuncture.

one other question, are you an experienced reloader? if you are not i'll have some more questions for you.

[fabsroman]

300 rounds a week is more than I load in a year of brass. Now, if we are talking about shotgun shells, I easily load more than that in a month.