Last year about this time I was lucky enough to buy a White Super 91 in .451 caliber (.45 rounded up) This is the most accurate rifle I own in my gun safe which includes alot of CF rifles. The White rifling is also 1:20 twist and will put a 460 grain full lead powerpunch bullet into one hole out to 75 yds. and 1/2" groups at 100 yds. using 70 gr. of T73Fg.
I killed two bucks in Nov. 2006 with it. One was a nice 8 point,Nov. 4th, hit in left shoulder, bullet traveled through shoulder, hit the heart and lungs and went out the right side two ribs from the end of the ribcage. I also killed a spike buck Nov.13 with the same rifle. I actually prefer it now to the Encore and hope to add to the kills for this rifle next season. No sabots and No swabbing required or needed, just keep on shooting.
If you like a conical shootin rifle, you owe it to yourself to check out the Whites. I was reluctant myself due to the company financial situation, but don't regret buying the S91 now. Actually wish I had bought one years ago, sure would have been cheaper.
You won't find those big conicals in Wally World, but they are available at No Excuses or BullShop or you can make your own if you are into that.