ceton.. the trouble you are going to find is although you claim to have ruined the barrel with lapping, it still has some rifling in it I am sure. With that small bit of rifling, you will not get consistent patterns from the rifle barrel. Another thing to consider is I am guessing this is a .50 caliber. A .62 caliber such as I use is a 20 gauge barrel. I am not sure what gauge the .50 caliber would work out to, but it will be very small. I do not think you could get too many lead pellets down it to make a gun able to take a turkey. I personally would not want to go smaller then a .62 caliber smoothbore for turkey.

You might have a rabbit and squirrel gun, and again.. you better get close because I do not think you will be happy with the pattern you will get. Although you could try it. Just be careful about how many grains of pellets you put down the barrel on top of the powder charge. Rememeber, if you load for instance 100 grains of pellets, you do have to take into account the amount of lead pellets you put in that barrel. All of this determines barrel pressures. I personally would not use the barrel for that reason alone, because it is not what the rifle was designed for.

As bigcountry inquired, how did you damage the barrel? What lapp method did you use? Also have you tried shooting conical projectiles from the rifle like the maxi ball? Sometimes the old worn rifles start shooting a different projectile better then what they used to.. you just have to experiment.