I shoot cast .25 caliber quite a lot in single shot target rifles. The maximum bullet weight (length, actually) that will stabilize in my 14 inch twist Stevens rifles is about 95 grains. Serious Schuetzen competitors do shoot 120 and 130 grain bullets, but through 10" twist barrels. (Some of these guys can shoot teacup size groups all day long at 200 yards,
offhand.)
For plinking, the common 86 grain bullets sold commercially for the .25-20 WCF cartridge (used by some cowboy shooters) will do nicely. Gas checked and cast fairly hard, they can be pushed to 2000 fps when sized .258 or a bit larger. Most mould makers have a good .25 caliber bullet in the 80-90 grain range.
NOE has this one:
http://noebulletmolds.com/NV/product...fccus9tg3d5q96
Notice that it's nominally 89 grains. Designed specifically for the common 14 inch twist. I have several NOE moulds. Only if they haven't got what I want will I look at another maker.
As for lead, use wheelweights with about 1% tin added, (use 50-50 solder), and you'll be fine.
As for loads - between 6 and 8 grains of Red Dot will do famously. Bullseye will also work. You'll get people recommending Unique, but at that pressure it will shoot very dirty.
Be VERY vigilant about double charges !
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