Here's the thing - the Altaros slugs all do well in the 880-900 fps range. No need for crazy speed. The 1:20 barrel does very well with the 66gr Altaros King. Don't know if you can get a heavier .25 slug, but the .257s don't count here. The .223 and .257 Altaros slugs are for the new HPS AAA rifles.Barely. Maybe in the mid 800fps (850fps?). So that extra BC would not be much benefit. The platform looks good, but I would go with the .22 and shoot 40gr at a higher velocity. I don’t like the 1:20 twist rate in the .25cal.
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