Tight neck, worth it in this rifle ?

[Marine sniper]

I am about to send my rifle to be re-reamed and am wondering if it might be worthwhile to wait and have it re-reamed with a tight neck chamber. The gunsmith I am sending it to only has a factory spec .30-.378 WBY chamber that is .344 at the neck. I have a tight neck (.333) 300 WBY and do not mind the PIA it is to neck turn the brass because I am very happy with the accuracy of the rifle and suspect I am getting longer case life out of the brass as well.

How much accuracy potential is in a tight neck chamber? How much additional brass life as well. I am very concerned with the accuracy potential of this rifle due to the amount of time and money I have put into it.

.30-.378 Wby
Hall E action
34 in 3/3 Pac-Nor
NF 5.5x22.

 

[Mikecr]

I don't think anyone can say that reduced concentricity will produce better accuracy. But if turning doesn't bother you, you will for sure have control and consistancy in neck tension after turning. If you're taking advantage of turned brass with proper neck sizing, you can go longer between annealing also.

These offer only a matter of control, and any advantage is purely tied to the barrel/load combination. So if your turned necks/sizing happen to be producing well for you, then if it were me, I'd continue with the tight chamber.
This is why I hold reamers for each of my chambers. I don't want change(setbacks).