1forthepot Posted March 22, 2011 Report Share Posted March 22, 2011 hi all, Here is my problem i have had a 7x64 made and i bought 80 norma factory rounds and 40 new (old stock)norma unprimed cases in the old wood grain boxes. i shot the factory stuff to get the cases so i did all the cleaning and preping and primed the 40 old new and 10 once fired and loaded them from the vit load data as follows; berger VLD hunting 140 grn powder n160 start load was 51-56 i found 52 to group best cci lrg br primer seated 10 thou of lands been out today to practise for test on saturday and had 12 shots all grouped well but 2 cases when ejected the primer fell out and there was pressure marks of the ejector plunger on the brass but there was no hard extraction when ejected. what is going on. Link to comment Share on other sites More sharing options...
c18rch Posted March 23, 2011 Report Share Posted March 23, 2011 Which ones did the primer fall out of? The reloaded factory brass or the old new brass? Link to comment Share on other sites More sharing options...
6mmBR Posted March 23, 2011 Report Share Posted March 23, 2011 been out today to practise for test on saturday and had 12 shots all grouped well but 2 cases when ejected the primer fell out and there was pressure marks of the ejector plunger on the brass but there was no hard extraction when ejected. what is going on. I think you have answered the question yourself. Too much pressure, you need to back the load off. I had a similar problem with my match rifle last year when temps went up a bit i started blowing primers. There was absolutely no sticky bolt lift what so ever. I backed the load off by a couple of grains and have not had a problem since Cheers Dave Link to comment Share on other sites More sharing options...
1forthepot Posted March 23, 2011 Author Report Share Posted March 23, 2011 i think it was the old new brass that popped the primer ,but does it make sense that the load used was not even 1/2 way through the vit load data start load was 51.4 and max was 56 i dont understand it. regards chris Link to comment Share on other sites More sharing options...
6mmBR Posted March 23, 2011 Report Share Posted March 23, 2011 All rifles are different yours is warning you that the load is too hot. Thats why it is important to start with starter loads and work up. Seating depth and internal capacity of cases can effect pressure hugely and also a tight bore will boost pressure. Cheers Dave Link to comment Share on other sites More sharing options...
1forthepot Posted March 23, 2011 Author Report Share Posted March 23, 2011 cheers dave i might try a different powder. Link to comment Share on other sites More sharing options...
c18rch Posted March 24, 2011 Report Share Posted March 24, 2011 Also if you have mixed the 2 lots of brass and don't know which lot is causing the problems it could be that one lot of brass is slightly thicker than the other which could be causing your pressure signs. Rich Link to comment Share on other sites More sharing options...
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