Sorry Riley,
That barrel is in a stock, I took an elk cow with it in 82', at 100 yds., heart shot. I don't shoot it much or hunt with it any more cause it is a cap lock. I haven't hunted with anything but a flintlock for about the last 20 years.
I don't think that Douglas made that barrel in a one inch profile. The only 1:48" twist Douglas barrels I have ever seen were at least 1.125" (1 1/8"). They used that twist for bench rifle barrels also, but those barrels are 1 1/2" accross the flat and weigh right at 1/2 lb. per inch of length.
See Ya, Pete