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Yep same, here's my original post about my problem https://www.nzhuntingandshooting.co.nz/f10/finding-gremlin-284-win-rechamber-32589/

AS far as im aware they do, when i found out the smith had two reamers (saami spec .321 and the tighter neck of .317) i opted for the .317, as over the years the 284 brass has got thinner on the...

Is that .313 on a fired case neck before resizing, if so you have an extremerly tight chamber, like a very tight match chamber. Might pay to re-measure.



That is very slow, im at 2700 fps with...

Yes i got excess pressure signs (heavy bolt and case head stamping) at very low powder loads. Once i turned the necks right down into the shoulder i could then run a more normal (higher) powder load...

Read my posts above about neck diameter in your chamber.

Measure the neck diameter of the fire cases, then measure the neck diameter of neck with bullet seated and pm me. Happy for you to call me for a chat about it all.

Who rechambered it, what is the neck diameter of your chamber, and what brass are you using abd what's the diameter of the neck on a loaded round.

I've been thru all of this with my 17" 284 and...