You taking it to the Vintage Cup this week by any chance to shoot in double bore class ? I’m not coming up but am curious .
Printable View
You taking it to the Vintage Cup this week by any chance to shoot in double bore class ? I’m not coming up but am curious .
Am I seeing that rifling right? It appears to be similar to ratchet rifling but reversed so it is the taper face driving the slug to rotate.
I have not understood the reason for ratchet rifling except possible that it produces better shot patterns than a standard rifling form. My impression from reading was that Fosbery tried several different types of rifling and settled on the ratchet style but that was for slugs if I understand correctly. Not sure why it would matter for slugs as long as the slug doesn't skid and with the choke constriction down to 0.690" from 0.740" I really can't imagine the slug skidding.
As for rifling twist, I have read differing opinions from various sources. Ross Seyfried says his H&H Paradox gun has 1:36" which seems awfully fast to me and especially for the time the Paradox gun was invented. The Paradox bullet is not far from square (diameter to length) so a slow rifling twist of something around 1:110" should be correct. Even a faster twist of 1:72" or thereabouts should stabilize a relatively long boolit so why 1:36"?
I contacted the Longon gun room of H&H a few years ago and asked some questions. The gun room manager was very friendly and helpful even though I told him I would not likely be a customer unless I won a large lottery. He managed to answer most of my questions but did not know the rifling twist. He said the gunsmiths simply used the original tooling.
As a note, the London gun room manager told me to stop by if I am in London and they would show me a Paradox gun and even let me shoot it! I thought that was a very generous offer since he knew I would not be a customer and this is no ordinary gun room or gun.
Modern rifled choke tubes run 1:36" to 1:38" and that is to suit sabot slugs. Round balls or square slugs do not need or want a twist that fast.
That is a great pic of the muzzle! The rifling twist does appear to be fairly fast so maybe 1:36" is correct?
Thanks for posting that.
Longbow
I was planning on shooting it in the stopping rifle class but I am not sure right now. We had a big debate about "extra" holes in the target last year from the wads and which holes to count. I pointed out that the holes showing the lead ring should be the one to score but I couldn't convince the scorer. I was surprised by how far the wads could go but they don't have the petals on them either.
I had to go back to my notes and the choke is approximately 1 in 36. Maybe it is a bit steeper than would seem to be required because there is a bit of skidding going on. There is about 30 points of choke in it so you wouldn't think there would be much of that happening. The slug I shoot is almost pure lead and the edges are lubed with Lee Liquid Alox and let dry. I haven't seen any leading yet. Those old guys had it figured out pretty well.
Attachment 304475
This is the first slug from the CBE mold. It is 700 grains with the hollow point. I have yet to test it for expansion but may do it this winter.
Thanks, Squid
That is my all time favourite boolit!
I have thought about buying a CBE mould and trying it as an attached wad slug for smoothbore. It might work with a rifled choke tube too but should certainly work in a fully rifled bore... I just have to buy a rifled barrel.
Longbow
There are a couple guys I know working on screw in rifled chokes but without a lot of success. I think it can be made to work just like a Paradox but it may take some effort. I have never had a fully rifled barrel so I cannot comment from experience but I don't see much reason that one wouldn't shoot well. I think the same factors apply as in any cast bullet rifle. I have been thinking about the attached wad idea much like the Brenneke but just haven't gotten around to working on it. I would like to see someone try it. The CBE molds I have are all excellent quality and cast nice boolits. I am not sure if he is still working as I had heard he was trying to sell it. I see the website is still up. Thanks, Squid
Squid Boy I wish I were coming tommorrow to see you and Kevin and Austin again . But the trip to Hausemanns is getting longer for a third trip this year if you count June there and July at Mike’s . Maybe next year ! I’m hoping the Vintage Cup will be at Pintail Point or Schraders next year .
I'm speculating here a bit, but it makes sense to me that a screw-in choke would benefit from gain twist rifling. I know a screw-in is quite short in relation to an entire barrel but entry at almost full velocity, around 15%-20% away from the muzzle - would be easier on the projectile if it entered straight on and then began to twist. I also agree that the twist probably doesn't need to be tight - I suspect a finish rate of 1-72" would be sufficient to spin that big boy...
Here is a guy making crimping tools for brass shells...
http://http://forums.nitroexpress.com/showflat.php?Cat=0&Number=335500&an=0&page=0#Post3 35500