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Thick case necks are one of those quiet accuracy killers that a lot of reloaders overlook. When the brass on the inside of your neck builds up past where it should be, it can squeeze the bullet, spike chamber pressure, and throw the occasional flyer that has you scratching your head at the range. The Forster NR1239 inside neck reamer handles that problem by cleanly removing the extra brass from the inside of your case neck walls, bringing things back to a consistent, bullet-friendly dimension.
This particular reamer carries a .2390" diameter and is built for .243 caliber (6mm) bullets. It mounts right in the cutter head of a Forster Case Trimmer in place of the pilot, so if you already run the Original, Classic, or Power trimmer you've got everything you need to put it to work. The tool is ground from high grade, wear-resistant tool steel, and the staggered tooth design is what really sets it apart. That tooth layout cuts brass smoothly without the chatter you can get from a cheaper reamer, leaving you a clean, even finish inside the neck.
Here's a detail worth knowing. The .2390" NR1239 is one of the sizes Forster keeps on the shelf specifically for reloaders who ream after the sizing operation, right before seating bullets. That makes it a popular pick for wildcat conversions and for folks running .243 brass who want the neck reamed at that stage. It's a slightly different approach than a standard neck reamer, which gets used after full-load firing and before sizing, so it pays to know which step you're working at.
Using it is straightforward. Drop the reamer into the cutter in place of the pilot, then turn the cutter assembly until the reamer passes completely through the neck. Keep turning as you withdraw it, then chamfer and deburr the case mouth afterward for a tidy finish. Do that and you'll have necks that seat bullets consistently and help keep your pressures and groups where you want them.
The NR1239 carries a .2390" diameter and is built for .243 caliber, or 6mm, bullets. It's one of the off-the-shelf sizes Forster offers for this popular bullet diameter.
It mounts in the cutter head of a Forster Case Trimmer in place of the pilot, so it works with the Original, Classic, and Power trimmers. If you already own one of those, you don't need anything extra to start reaming.
The .2390" NR1239 is one of the sizes Forster stocks for reloaders who ream after the sizing operation, right before seating bullets. That makes it a go-to for .243 brass and wildcat conversions, which is a bit different from standard reamers used after firing and before sizing.
Thick neck walls can squeeze the bullet, raise chamber pressures, and cause flyers that hurt your groups. Reaming shaves that excess brass out so your necks are consistent and your bullets seat the same way every time. A quick check is to slide a bullet into a fired, unsized neck and feel for interference.
| UPC | 757253004889 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | NR1239 |
| Caliber/Gauge | .243/6 mm (.243) |
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