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
Rifles, Bullets, Barrels & Ballistics
338 Sherman Build (This Is My Boomstick!)
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="benchracer" data-source="post: 1330136" data-attributes="member: 22069"><p>I now have 40 fire formed PRVI .270 cases and 25 fire formed Norma cases. The Hornady 250 HPBT's I used as fire forming bullets are BLUNT, to put it mildly. The OAL to the lands with this bullet is only 3.332". In contrast, the OAL to the lands with the Bergers is 3.575". Hornady claims a .675 g1 bc for this bullet. I don't think so...</p><p>[ATTACH=full]78366[/ATTACH]</p><p></p><p>Above are fire forming loads with the Hornady 250 HPBT, along with examples of formed cases. Norma brass is on the left, PRVI on the right. I charged the cases with some H-380 that I wanted to burn up and seated the bullets for a .020 jam.</p><p></p><p>Here, again, I ran into something to add to my "Lessons Learned" file. The H-380 had been in my possession for about ten years. I had a partial pound in one can, and a full pound in the other can (which was still factory sealed). I loaded the Norma brass with a middling powder charge, using Hornady 338-06 data, from the can that had been factory sealed, and produced nicely formed cases without incident.</p><p></p><p>I had loaded the PRVI cases from the partial can of powder, using the same powder charge as the Norma cases, and encountered ejection marks, heavy bolt lift, and sticky extraction, immediately. I discontinued firing these rounds until I could pull the bullets and reduce the powder charge. I reduced the powder charge by approximately 10% and was able to proceed with fire forming without further incident.</p><p></p><p>It appears that the powder in the opened can of H-380 had dried out somewhat with the passing of time, speeding up the burn rate. So noted...</p><p></p><p>I hope to complete fire forming and barrel break-in next weekend.</p></blockquote><p></p>
[QUOTE="benchracer, post: 1330136, member: 22069"] I now have 40 fire formed PRVI .270 cases and 25 fire formed Norma cases. The Hornady 250 HPBT's I used as fire forming bullets are BLUNT, to put it mildly. The OAL to the lands with this bullet is only 3.332". In contrast, the OAL to the lands with the Bergers is 3.575". Hornady claims a .675 g1 bc for this bullet. I don't think so... [ATTACH=full]78366[/ATTACH] Above are fire forming loads with the Hornady 250 HPBT, along with examples of formed cases. Norma brass is on the left, PRVI on the right. I charged the cases with some H-380 that I wanted to burn up and seated the bullets for a .020 jam. Here, again, I ran into something to add to my "Lessons Learned" file. The H-380 had been in my possession for about ten years. I had a partial pound in one can, and a full pound in the other can (which was still factory sealed). I loaded the Norma brass with a middling powder charge, using Hornady 338-06 data, from the can that had been factory sealed, and produced nicely formed cases without incident. I had loaded the PRVI cases from the partial can of powder, using the same powder charge as the Norma cases, and encountered ejection marks, heavy bolt lift, and sticky extraction, immediately. I discontinued firing these rounds until I could pull the bullets and reduce the powder charge. I reduced the powder charge by approximately 10% and was able to proceed with fire forming without further incident. It appears that the powder in the opened can of H-380 had dried out somewhat with the passing of time, speeding up the burn rate. So noted... I hope to complete fire forming and barrel break-in next weekend. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Sherman Build (This Is My Boomstick!)
Top