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One of the brass allows a 225 grain Sierra .358 BTSP to fall into the case while barely touching the neck. The other the bullet has to be lined up very straight and a bit of a push to slide it into the neck. Does that mean this rifle needs swaged bullets?

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In my experience, any fired case which will allow a bullet to be pushed into the neck reflects sufficient neck clearance. If you have the means, I would recommend measuring the thickness of the brass at the neck. There may be a variation between the two cases.

If you form brass from 8X57IS cases, which I would suggest doing, you will find that the case neck thickness is reduced by the forming process, which may well solve the "problem" with that rifle. I have experienced an original neck thickness of .014" reduced to .012" by neck expanding.

I have had no experience with recently manufactured Kynoch ammunition, but the old ammunition used to be quite thick at the neck. Cases formed by necking down 9.3X57 brass could be expected to thicken at the neck, and cases formed from .30-'06 would almost certainly require neck reaming or turning.

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