Quick disclaimer load the rifle according to manufacturer load data. what is safe in my rifle may not be safe for yours. There that part is done. That depends on what the stag horn mag rifle likes. The rifle can safely handle 150 grains of powder. black powder is measured by volume not weight. I have a staghorn mag. in 50 cal and it likes 100 grains of pyrodex pellets. I have shot 150 grains of both loose pyrodex and pellets but with no great accuracy. All because the rifle can handle 150 grains of powder doesn't mean it will shoot your bullet accurately. My rifle likes the 100 grains and I get decent groups. There are other factors as well bare in mind different bullets and will shoot differently too.
50-300
How much is a savage 7mm
.22 Mag only.
NO.
250
Yes
There are 4 syllables. Mag-ic-cal-ly.
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10 bucks
100-500
Single Action revolver made in Germany.
100-300 or so