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Rifles, Reloading, Optics, Equipment
Reloading
Newbie reloader question
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<blockquote data-quote="jarnold37" data-source="post: 2426300" data-attributes="member: 29241"><p>I think that Weatherby chamberings all have a big jump from the ogive to the lands. It allows for just a little more advertised velocity. I have chambered several barrels in Weatherby chamberings and have always had reamer made to not cut the freebore. Powder charge needs adjusted when loading with just 5 thousands off lands because when close to the lands the pressure increases. I built a 338-378 and chambered a 2" diameter 30" long barrel. Sent a dummy round to reamer manufacturer so that he would make reamer with no freebore. Got the reamer and chambered the barrel and apparently the reamer maker didnt look at my dummy rounds. Big 1/4" jump to the rifling. He made the reamer with standard Weatherby throat.. I ordered the second $400 barrel, because I didnt want to sacrifice length, and sent reamer back to reamer maker, and chambered second barrel, and same thing, the reamer had not been changed, and "ruined" another barrel. So ordered a third barrel and got a different brand reamer to chamber this time. I have been warned not to use factory Weatherby ammo in these no freebore Weatherby chamberings, due to extreme pressure spike with not having a split second to peak before bullet hits the rifling. Accuracy seems to suffer with that big jump. Measure and see, but probably you can you seat bullet out farther than manuals say, just so cartridge will fit in magazine. That is if you adjust powder load for a little more pressure.</p></blockquote><p></p>
[QUOTE="jarnold37, post: 2426300, member: 29241"] I think that Weatherby chamberings all have a big jump from the ogive to the lands. It allows for just a little more advertised velocity. I have chambered several barrels in Weatherby chamberings and have always had reamer made to not cut the freebore. Powder charge needs adjusted when loading with just 5 thousands off lands because when close to the lands the pressure increases. I built a 338-378 and chambered a 2" diameter 30" long barrel. Sent a dummy round to reamer manufacturer so that he would make reamer with no freebore. Got the reamer and chambered the barrel and apparently the reamer maker didnt look at my dummy rounds. Big 1/4" jump to the rifling. He made the reamer with standard Weatherby throat.. I ordered the second $400 barrel, because I didnt want to sacrifice length, and sent reamer back to reamer maker, and chambered second barrel, and same thing, the reamer had not been changed, and "ruined" another barrel. So ordered a third barrel and got a different brand reamer to chamber this time. I have been warned not to use factory Weatherby ammo in these no freebore Weatherby chamberings, due to extreme pressure spike with not having a split second to peak before bullet hits the rifling. Accuracy seems to suffer with that big jump. Measure and see, but probably you can you seat bullet out farther than manuals say, just so cartridge will fit in magazine. That is if you adjust powder load for a little more pressure. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Newbie reloader question
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