Interesting - it's probably only good for cracking walnuts or tightening lug nuts.
I did a bit of a test yesterday, on paper. I am getting the odd flyer which might be attributed to the wierd breaching system on this rifle. It doesn't have a solid tang with plug - but the tang has a projection stud that fits the plug that's in the barrel's breech. The plug is no other than a recess socket bolt. There is nothing but the barrel lug pins that keep the barrel in the stock, along with whatever help the loose fitting projection is. This means it's free to move under recoil and it does. I'm either going to put in a proper tang and plug- (best case) or dovetail in one or two recoil plates in the bottom flat and glass them into the forend. I may do that any way, and replace the cuttent tang with a proper one.
As you can imagine the current system throws flyers - sometimes I can shoot 5 or even 10 shot groups, no flyers - other times a flyer will be out 3" at 50 yards for no reason in every group withperfect holds - drives me up the wall, sometimes.
As to the wierd crown - it doesn't effect accuracy that I can tell. The muzzle is coned about 3/8" deep.
The grease I built from beeswax/olive oil and neetsfoot oil was too heavy - and thick - though very, well, greasy & slick. There was a tendency to punch the ball right through the .0215" denim, although there was never any fouling buildup in the barrel and the fouling always was soft,even with blown or torn up patches. The wierd crown sure packed up with grease - temp about 36F.
LHV shot the best, of course. Got some tight grouping, but had flyers wrecking things with all combinations. Best grouping came with only 60gr. 3F, .395" ball and .0215" denim - 10 oz. This was the last group shot after perhaps 60 shots - one flyer, maybe opened group to 1 1/8".
The more I shoot his rifle, the more flyers it is throwing. There was a time couple years ago, it threw no flyers at all - tight 1/2" to 3/4" 5 shot groups at 50 yards virtually every time. A new tang with plug might solve the current difficulties.
Yesh, Roger - I think it's kind of ugly, but cute too. Kinda like a Pug or Boston Terrier, about as useful as well.