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Two things, however, are critical. First the cast bullets MUST be made from linotype. Wheelweights just don't work (don't know why). Second, the powder charge is critical. Think I ended up using 8 grains of unique, which was WAY below the maximum listed in Lyman's handbook.
With linotype bullets and the right powder charge these guns are really great. With wheelweight bullets and/or the wrong powder charge accuracy is non-existant.
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Lino casts about a thou bigger than WW. That's enough to make a huge difference in accuracy in some rifles. Eight grains of Unique would give about 1000 fps. Lower pressures are more tolerant of undersized bullets.
With a GC bullet a thou or two over groove diameter and a decent bore, there is no reason not to expect 2 moa at 1800 fps with aircooled WW. The sights on those rifles are nasty so you can add a couple more MOA unless you scope it.
If all you are interested in is a 50 yard plinker, the Hornady .314 SWC over 5 grains of Uniqye with one grain of dacron should shoot under 1.5" at 50 yards.