[Universeman]

Greetings,

i'm a new member to this forum and i had an issue at the range with some handloads today.

my problem is with my .257 wby mag.
i've been working up a load and took three loads, two different powders to the range today. shot three of each at 100 yards one looked promising. i shot two more at 300 yards and started to get high pressure signs. these loads are well under max in the book and the first three showed only a slight mark on the head.
the last one i shot collapsed the shoulder in severely. i had this issues once before but i discovered that i had over charged those rounds by accident.
my question is if anyone has seen this before and knows a cause. could it be something wrong with the gun itself. the cases seem to have quite a bit of soot on them after firing as well.

the loads we as follows.

115gr nosler ballistic tip
67.0 gr imr 7828

115gr nosler ballistic tip
62.0 gr viht N165

115gr nosler ballistic tip
63.0 gr viht N165

this was all brand new never fired weatherby brass

Shoots factory rounds without a problem

Thanks!