where to get plug gauge set to determine correct inside neck reamer size

[Cassidy]

After firing my 6.5x47 lapua brass four times (at up to max loads) an FL sizing with each reload in past months, after FL sizing the brass after the 4th firing, the shoulder bump has gotten tighter (bolt lever will lower with moderate force so I think the cases are still usable; no click upon ejecting), however, I am unable to fully seat the 123gr lapua bullets - they will not seat beyond the neck-shoulder junction despite some force on the arbor lever, so it appears to me that the "dreaded donut" has formed. So I think I need to get a Wilson inside neck reamer (to use in my Wilson case length trimmer), however, first I need to determine the correct inside dimension of these case necks so I can order the correct size reamer (I do not have an inside micrometer). My understanding is that a set of plug gauges will allow me to determine the correct reamer diameter to remove the donut without removing brass from the rest of the neck inside surface. Where can I get a good set of plug gauges for this purpose. Once I know the correct neck inside diameter, I can order the correct size Wilson inside neck reamer from Sinclair or somebody. First time I have run into this donut problem - trying to fix it. Am I taking the right approach? Also, my understanding is that risks associated with the "dreaded donut" are (1) inaccuracy, and (2) safety, but I don't know what the safety risk is - what is it?

 

[waltk]

I purchased my set of gauges from Enco. But I had a discount for price and shipping.
I would shop around and look at Amazon.com also.
I chose the .0002 under size option.
These gauges are an excellent and/or the best method to really determine the inside dia.
of the case neck. No more math figuring to determine "neck tension". The gauge measures the ID for what it really is.

 

[Cassidy]

Thanks, Walt! I'll call Enco.