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Cast .25 Cal shooters....25 TCU question
Posted: Wed Sep 02, 2020 2:39 pm
by Mustang Gregg
I am putting together an XP that I'd like to try shoot cast bullets through. It has a new Shilen stainless 1:9" twist and I have not slugged it.
I used to have a TC barrel in .256 WM that shot .257" bullets great.
I'd like to ask if most of you shoot bullets sized to .257" or to .258".
Much obliged,
Mustang Gregg
Re: Cast .25 Cal shooters....25 TCU question
Posted: Wed Sep 02, 2020 4:20 pm
by high standard 40
Slugging the barrel is not as beneficial as a chamber cast would be. I whould size the bullets to fit the chamber throat (free bore - leade). Then seat the bullets as far into the throat as possible. I have a 7 TCU XP100 with a .284" bore. I could not get acceptable accuracy until I sized to fit the generous throat, .287". I use this same technique on two other 7mm guns and each of these 3 require different bullet dimensions. They each perform their best with bullets that fit the throat.