Yes I use a few of those in the real old Speeders that were regulated for the 215gr slug, but I haven't been shooting any game with them in the 303, lots in the 30/06 back in the day .
Grandpamac I have a mint barreled Westley Richards & she really shoots some 180gr Hornadys I had laying around, flat based slugs !
You know I haven't slugged the bores so who knows what they really are ?
I shot some .318 8mm bullets in my worn out BSA sporter & it went from a foot size key hole pattern to small group right on the sights, I first checked that a fired case would release a .318 size bullet !
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