Eric @ possumhollow makes excellent guides. Bought most of my action/cartridge dedicated ones from Sinclairs but turns out possumhollow make them for Sinclairs. The one size fits all a la gun shop are not very good unless you find one that fits your rifle correctly. They either don't centre your rod properly of don't seal the chamber properly from solvents running back into your action. Also need to get them with the solvent port. If getting the tubular alloy ones get them with the correct sized snout on the end rather than the tapered cone.
https://www.possumhollowproducts.com/
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