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Thick case necks are one of those quiet accuracy killers that a lot of reloaders never think to check. When brass builds up on the inside of the neck, it can crowd the chamber, spike pressures, and throw the odd flyer that drives you nuts at the range. This Forster inside neck reamer is built to fix exactly that, cutting the inside of .458 caliber case necks back down to a uniform wall thickness for a proper, repeatable fit.
Forster grinds this reamer to 0.4605", which runs the usual .0025" to .003" over the .458" bullet diameter. That little bit of extra clearance is intentional, giving you a clean neck that seats bullets the way it should. The cutter itself is made from high-grade, wear-resistant tool steel, so it holds an edge through plenty of brass before it ever shows its age.
The staggered tooth design is the detail that sets this one apart. Instead of grabbing and chattering its way through the brass, the offset cutters shear it smoothly, leaving a clean inside wall rather than a rough, galled finish. That smoothness is what makes neck reaming worth doing in the first place, since the whole point is consistency from case to case.
This reamer mounts in the cutter head of a Forster Original, Classic, or Power Case Trimmer in place of the pilot, so if you already run one of those trimmers you're set to go. Best practice is to ream after firing a full load and before your neck or full-length sizing step, then chamfer and deburr the case mouth when you're done. A quick way to know if you even need it: slide a bullet into a fired, unsized neck, and if you feel drag or interference, that neck is a good candidate for reaming. For anyone loading big-bore .458 brass and chasing tighter, more predictable results, it's a simple tool that pulls real weight on the bench.
It removes excess brass from the inside walls of your case necks so they return to a uniform thickness. Thick necks can crowd the chamber, raise pressures, and cause flyers, so reaming brings things back to a proper, consistent fit. The result is cleaner, more predictable bullet seating on your .458 caliber brass.
Forster grinds its standard neck reamers .0025" to .003" larger than the maximum bullet diameter on purpose. For a .458" bullet that works out to the 0.4605" dimension on this reamer. That slight clearance leaves a clean inside neck that seats bullets correctly.
Yes, it's designed to mount in the cutter head of a Forster Original, Classic, or Power Case Trimmer in place of the pilot. The trimmer is sold separately, so you'll want one of those on the bench to run this reamer. If you already own a Forster trimmer, this drops right in.
The rule of thumb is to ream after the case has been fired with a full load and before the neck or full-length sizing step. After reaming, chamfer and deburr the case mouth before moving on. A quick check is to slide a bullet into a fired, unsized neck, and if you feel interference, that neck is worth reaming.
| UPC | 757253005060 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | NR1458 |
| Caliber/Gauge | .45 Caliber |
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