If you’re just learning to engrave, for a Kentucky rifle, a simple square graver will be all you need for 95% of the work. If you want to do some chicken tracks for a border, then get a small flat as well.
Whether you’re going to push the tool or use a hammer doesn’t make much difference, other than maybe the angle of the heel. Although a die sinker might seem to be a stouter tool, it’s still the point that does the cutting, and doesn’t matter if the shank of the tool is 1/8” in diameter or 1” in diameter as far as the longevity of the point is concerned. If you plan on smacking the die sinker with a big ol ball peen hammer to get the metal out of there in a hurry or cut the design quickly, you’ll be disappointed. Lots of taps with a small light hammer is what it takes.
Also, using a crumby tool of poor quality steel, or incorrect point geometry will be an exercise in futility.
I can understand the satisfaction of making your own tool that some guys enjoy, but if you’re just learning, buy a high quality graver! After all, if you can afford $250 for a barrel, $125 for a lock, another couple hundred for the wood, surely you can afford 15 bucks for a graver that will last for many years with proper use and care!
For the guys learning to engrave, study and learn to grind the point correctly!!! A poorly shaped point, whether you’re pushing the tool or hammering, will sour your learning experience quicker than a heartbeat.
Just my 2 bits,
John