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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Thinking about building a 338 of some sort
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<blockquote data-quote="gkmiami" data-source="post: 1712568" data-attributes="member: 111278"><p>New guy here... I somewhat of a 338 fan myself and had built up a 338 WM with a custom Kreiger some time ago. The day came (naturally I suppose) that I wanted more speed. Problem was that I didn't want to spend the money for a new reamer and loading dies. I already had a new Kreiger 5R blank and 338 WM and 300 WM reamers so I decided on building a 338/300 Win Mag. The only thing I ordered was separate 338 necker and throater reamers. I started the chamber with the 338 reamer ( probably didn't need to) and went about half way. I then swapped the 338 pilot to the 300 reamer and finished the chamber to headspace. Then came the necker and throater reamers. I throated the chamber out to give an OAL with 250 gr SMK's about 3.730" and had to use 3.850" detachable bottom metal to finish the project. </p><p>I'd already made a body die from a 338 WM sizer die cutting it off at the shoulder and then taking enough off the bottom to run it a little further up into the die. After sizing the body I adjust my current 338 WM sizer up to just bump the shoulder. I then seat the bullets with a standard 338 seating die.</p><p>By virtue of the extra powder capacity and long throat I've been able to gain nearly 200 fps over my old 338 WM. With 250 gr SMK's I am getting 2,950 fps and was a happy camper with the success of the project. 300 Win Mag brass is much more available and cheaper and I feel I'm within spittin' distance at the least of the RUM and Lapua. And 1/2 MOA performance topped it all off. My load is 80.0 grns of H4831SC.</p></blockquote><p></p>
[QUOTE="gkmiami, post: 1712568, member: 111278"] New guy here... I somewhat of a 338 fan myself and had built up a 338 WM with a custom Kreiger some time ago. The day came (naturally I suppose) that I wanted more speed. Problem was that I didn't want to spend the money for a new reamer and loading dies. I already had a new Kreiger 5R blank and 338 WM and 300 WM reamers so I decided on building a 338/300 Win Mag. The only thing I ordered was separate 338 necker and throater reamers. I started the chamber with the 338 reamer ( probably didn't need to) and went about half way. I then swapped the 338 pilot to the 300 reamer and finished the chamber to headspace. Then came the necker and throater reamers. I throated the chamber out to give an OAL with 250 gr SMK's about 3.730" and had to use 3.850" detachable bottom metal to finish the project. I'd already made a body die from a 338 WM sizer die cutting it off at the shoulder and then taking enough off the bottom to run it a little further up into the die. After sizing the body I adjust my current 338 WM sizer up to just bump the shoulder. I then seat the bullets with a standard 338 seating die. By virtue of the extra powder capacity and long throat I've been able to gain nearly 200 fps over my old 338 WM. With 250 gr SMK's I am getting 2,950 fps and was a happy camper with the success of the project. 300 Win Mag brass is much more available and cheaper and I feel I'm within spittin' distance at the least of the RUM and Lapua. And 1/2 MOA performance topped it all off. My load is 80.0 grns of H4831SC. [/QUOTE]
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Thinking about building a 338 of some sort
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