Am thinking a trip to ace hardware for a 1/4 x 20 screw, wing nut and 3 flat washers would do. A couple of biggish nails, a little glue
Any old hard wood dowel some where a round 9/16 to 3/4 or maybe as larges as 1 inch and an old belt or other strip of leather and you would be in business.
I may well make my shooting sticks out of some old hockey sticks I have laying around. If I wanted to be cute, would leave the blades as part of the sticks
At 50 or 100 yards, where you will probably work on getting groups first a spotting scope helps, but with anything from about 2 power up you can see 45 caliber holes. Any binos you might have will work just fine.
I will hit the range with my sharps tomorrow and test some loads using a Seaco 645 480 grain bullet sized to .459 seated out to touch lands. 68.2 with .045 and .107 compression and 70.2 grains with .115 and .187 compression.
Using smokeless (varget) I was able to put 9 415 gr desparados sized .460 in about 3 inches at 100 last week.