Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Reloading
257 stw blowing primers
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Trickymissfit" data-source="post: 707224" data-attributes="member: 25383"><p>now I'm assuming that you are having the primers move out of being seated in the case. Right? If the primers are pierced, I'd be checking the firing pin protrusion. If by chance you reamed the primer pockets, I'd be checking the diameter of them. I've seen them open up rapidly with high pressures. I have no real data on the .257 STW case. It is excessive overbore so that may contribute to an over pressure problem. But I'm think the problem is opposite, and may need another grain of powder. Big overbore case don't like being down loaded much, and your load isn't all that much greater than the same bullet in a .257 WBY mag. On the otherhand something like 4831 might be better (80 grains of 4831 with a 120 grain bullet is max in 7stw).</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 707224, member: 25383"] now I'm assuming that you are having the primers move out of being seated in the case. Right? If the primers are pierced, I'd be checking the firing pin protrusion. If by chance you reamed the primer pockets, I'd be checking the diameter of them. I've seen them open up rapidly with high pressures. I have no real data on the .257 STW case. It is excessive overbore so that may contribute to an over pressure problem. But I'm think the problem is opposite, and may need another grain of powder. Big overbore case don't like being down loaded much, and your load isn't all that much greater than the same bullet in a .257 WBY mag. On the otherhand something like 4831 might be better (80 grains of 4831 with a 120 grain bullet is max in 7stw). gary [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
257 stw blowing primers
Top