Yes it is a pistol barrel on my rifle intentionally. But 20 years ago it was hard to find a high quality rifle barrel in .429". Not that easy even now.
After all '92s are pistol caliber rifles. Douglas uses a proven 1 in 16 twist in the .429" specifically for silhouette competition and heavy for caliber bullets. Which is what I was looking for, accuracy with 240g or even 300g 44 mag bullets.
Shilen uses 1 in 20 for their .429 barrels. 44/40 liners are generally 1 in 25. Modern replacement BP rifle barrels generally run 1 in 32. Which is a little slower than Winchester used, 1 in 36, for the '92 in 44/40 and a 200gr bullet. Same 1 in 36, for the 180gr in the 38/40.
Winchester 45/90 originally might run a 1 in 20 for heavier bullets or a 1 in 32 in the Express 300gr. loads. 45/70 went with 1 in 16 as the norm for the original heavy for caliber 500 and 400 gr bullets.
There looks to be a trend here
I did a very similar rifle based on a '73 action in 45 Colt. Used the same Douglas match barrels but only 21.5" long. It likes 230gr lead flat nose and surprizingly 230 JHP 45 acp bullets and will put a mag full of either into one hole at 50 yards from a rest. If you can see an 8" steel plate chances are you can hit it with the '73. Never bothered to work up a super accurate load for the 44 as I shoot the '73 more for that sort of thing. Likely a good trigger and good sights have much to do with it any way. But I do like the horse power of a fast 300 gr bullet with the 44.
![Image](http://standingwave.org/albums/rifle/aeh.sized.jpg)