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If you handload .300 Winchester Magnum and you're after every last bit of consistency, this is the seating die that precision reloaders keep coming back to. The L.E. Wilson chamber type seater works on a different principle than a standard threaded die. Instead of pushing the case up into a die body, it cradles your loaded round in a chamber that mimics your rifle's chamber, then drives the bullet straight down with a close-fitting stem. Everything stays aligned before seating ever begins, and that's where the low runout comes from.
The case and bullet are completely captured by the die before the bullet is pushed into the case mouth. That full capture, paired with a seating stem machined to such tight tolerances it can draw a vacuum against the body, is why this style outperforms a conventional 7/8-14 TPI seating die. There's only one moving part during the actual seating stroke, so there's very little room for the bullet to tip or wobble on its way into the neck. Benchrest and long range rifle folks have leaned on these dies for decades for exactly that reason.
This one runs in an arbor press or with a hand press, not a conventional reloading press, so keep that in mind if you're putting your bench together. Seating depth is dialed in by turning the screw inside the cap, which uses 3/8-24 TPI threads for fine, repeatable control. The included seater base lifts the round up off the arbor plate so a live primer never rests against a hard surface during seating. It's a simple, clean setup once you have it adjusted.
L.E. Wilson has been machining precision reloading tools in the USA for over 90 years, and this die carries that same standard. The all stainless steel construction holds up to heavy use and keeps its dimensions round after round, so your loads stay as consistent on the thousandth cartridge as they were on the first.
No, this is a chamber type hand die built for an arbor press or hand press, not a conventional threaded press. The round is set on the seater base and the die slides over it while the stem is driven down to seat the bullet. Many precision reloaders pair it with a dedicated arbor press like the K&M for the smoothest, most repeatable feel.
The case and bullet are fully captured and aligned inside a chamber that mimics your rifle's chamber before seating ever starts. With only one moving part during the seating stroke and a stem machined to extremely tight tolerances, there's almost no room for the bullet to tip. That alignment is what produces the low runout and tight concentricity these dies are known for.
Seating depth is set by turning the screw inside the cap, which uses 3/8-24 TPI threads for fine control. Loosen the set screw with the included hex wrench, dial in your depth, then snug it back down. It's a good idea to seat a dummy round with no primer or powder first to confirm your overall length before loading live rounds.
It ships with the standard seating stem. If you're loading VLD or long secant-profile bullets, Wilson offers a separate VLD stem reamed with a steeper angle that grips lower on the bullet, and it drops right in as a replacement. For most common .300 Win Mag bullet shapes, the standard stem works just fine.
| UPC | 815145021519 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BS30-WMG |
| Shipping Weight | 1.0 |
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