Wilson neck reamer- hand use

[BradY]

I know the wilson neck reamers are designed to be used with the trimmer, but is there any negative in doing it by hand. Ive measured a fired case and I have 1-2 thou clearance on the cutter and it takes a cut basically right at the case mouth, then leaves a section, then cuts the donut on the case neck out. The cutter obviously follows the hole and cuts any section that is wider out, without opening up the neck anymore to the point I would have to change sizing bushings.

 

[Immike]

I am wondering why a cut at the mouth? Carbon building in your chamber possibly. I have done it by hand and found it better to have several reamers and take out a little at time. The doughnut seems to be imperfect and thicker one side or the other wanting to push the reamer to the thinner side.

 

[BradY]

Hi Mike

Borescope shows no carbon in chamber- or barrel as it got some iosso love this evening after fireforming 100 new shehane cases.

I neck up from 6.5x284 to 7mm on a K&M mandrel, do the flash holes and primer pockets, chamfer inside and outside the case mouth then FL size with a 310 bushing before loading 54gr H4831sc. The chamber is 318 no turn 284 shehane. These cases have had 3 firings including fireforming.

I agree the donut does seem to be imperfect and often is more pronnounced on one side. Im doing it fairly slowly so it doesnt take off on me. Will keep an eye on neck concentricity and if it goes south I think I will invest in a trimmer and by the sounds of it a custom case holder.