May 16th, 2018

The Honed-Neck FL Sizing Die Option — Alternative to Bushings

Custom honed FL dies non-bushing die Forster

Tired of messing around with neck bushings? Is there a simpler (and potentially better) solution for controlling case neck tension? Yes there is — the precision honed non-bushing die.

You can purchase a Forster non-bushing Full-length sizing die for many popular cartridge types for under $50.00. Then you can send that die to Forster, and Forster will custom-hone the neck for a nominal $12 fee plus return shipping*. When done right, the honed FL die can load ultra-straight ammo with the precise next tension you prefer for your brass and bullet choice.

Alternative to Bushings — Honed Full-Length dies
Conventional, non-bushing full-length sizing dies can create ultra-accurate ammo with very low run-out. For some applications, we prefer a non-bushing FL die over a bushing die — so long as the neck tension is correct. But many FL dies have an undersized neck diameter so you end up with excess neck tension, and you work the brass excessively. Forster offers a simple, inexpensive solution — honing the neck diameter to whatever size you want*.

If you purchase a Forster non-bushing, full-length sizing die, Forster will hone the neck dimension to your specs for $12.00 extra (plus shipping). This way you can have a FL die that provides the right amount of tension for your particular load. (The max amount of diameter change Forster can do is about .008″) Forster dies are relatively inexpensive so you can afford to have a couple of FL dies with necks honed to different diameters — such as 0.266″ and 0.267″ for a no-turn 6mmBR. The die itself is fairly inexpensive — currently Precision Reloading charges $41.49 for a Forster 6mmBR FL sizing die (Forster Part #018121).

Forster FL dies, necks honed to .265″, .266″, and .267″.

Steve Rasmussen of gave this a try. In fact, he had three dies made — each with a different neck dimension. Here’s his report: “My original Forster 6BR FL die sized the necks down a lot [to about 0.260″]. I sent my die in and asked if they could supply two more FL dies (for three total) to have the necks honed to 0.265″, 0.266″, and 0.267″.” In addition to the purchase cost of two more FL-sizing dies, Steve paid $36 ($12 per die) for the three dies to be honed.

Steve’s honed dies produced very straight loaded ammo:
“Brass springback after sizing is running 1 to 1.3 thousandths. My loaded rounds are running 0.2697-0.2699 using [older Gold Box Lapua brass]. So far the dies are working well. I sized 80 cases with the 0.266″ necked die. The shoulder is running 0.4582″ and 0.300″ up from the base is 0.4684". I spun 20 of ‘em and 16 had a runout of one thousandth (0.001) and the other 4 at 1.5 thousandths (0.0015).”

*Here is Forster’s description of its Die Honing Service:

We custom hone the inside neck diameter by using a diamond stoning process. We enlarge the inside diameter to your specification to prevent over-sizing of the case neck due to thick neck walls. You may require this service for multiple reasons: 1) If you use some brands of brass cases which have thicker neck walls. 2) If you do not intend to outside neck turn case necks that have thickened after repeated firings. Please specify desired inside neck diameter. Note: 1) No more than .008″ stock removal from your existing die neck diameter is possible. 2) Honing is done in increments of one half thousandth of an inch (.0005″), meaning that your specified inside diameter must be either.XXX0″ or .XXX5″. FEES: $12.00 plus actual return shipping cost & insurance Please allow 1-3 weeks.

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