Nitro - sounds as if the barrels are shooting together at 25, then diverging at 50yards. This might limit your accurate hitting to 100 or 125yards, which might be all you need or want, of course.

Some work on handloads might get them shooting parallel or shooting together at 75 or 100yards, which might be better - lots of time to work on it though for finetuning if actually needed.

Sounds very good so far.

I really like the writing script for the stamping. I didn't see hammer strike engraving, but then, the writing/engraving might have been done with power, thus no chisel marks. Nicely done, regardless- looks good.