Got a CZ527 in 6.5 Grendel that hovers between 0.5 and 0.25 inch groups, and a Thompson Encore with 223 and 308 barrels that has shown it's capable of about the same.
I've got no experience with old BSA's but if people don't think they aren't capable of much better than 1.5 MOA, it'd be interesting to find out why. A properly bedded strong action with a good quality free floated barrel should be mechanically capable of sticking bullets inside of an inch.
What's the twist rate of your barrel, what bullets are you shooting, and how are you forming and reloading your brass?
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