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+---- Thread: What do we really know about the transonic zone? (/thread-3158.html)
RE: What do we really know about the transonic zone? - Kurt - 07-28-2021
That looks like the bullet John Maden sent the drawing to BA for and Jim put it in his lineup.
RE: What do we really know about the transonic zone? - Don McDowell - 07-28-2021
Nope it's the bullet Zack cast up from an original 1881 Ideal mould and sent to BACO
RE: What do we really know about the transonic zone? - Don McDowell - 07-28-2021
My 77 in 45-90 doesn't particularly care for it, maybe with a bit more load messing it might.
Did see it shot from 2 45-70's at Alliance this past weekend, and it looked to hold very good vertical at 1000.
RE: What do we really know about the transonic zone? - Distant Thunder - 07-28-2021
Don,
I know I said the original "Ideal" Postell, but I think there was some poetic license taken with that bullet. The way I understand it is that the Ideal Postell was supposed to be a grease groove version of the Sharps long range paper patch bullet. I believe they ended up making the nose diameter undersize on the grease groove bullet and that changes the proportions some. The paper patch bullet you posted first is the better nose shape I think, at least it looks better. Well, that might be just because it's paper patched!
RE: What do we really know about the transonic zone? - Kurt - 07-28-2021
Zack I think got the bullets from Bob Saathoff. He has the original Ideal 457-132 that mould even came adjustable for the 415g, 475g, 535g
RE: What do we really know about the transonic zone? - Don McDowell - 07-28-2021
Jim that patched bullet nose is a bit more rounded than the grease groove. The patched bullet does shoot well at 1000 , but I think I may of screwed up a little when I had him make it 1.45 long. I think taking the length to 1.4 would help it greatly in the 18 twist. Eddie had one made in straight sided at .446 1.4 long and it shoots very well.
If we ever get rain again, I want to try the bullet as is in the 110's to see if the extra velocity will eliminate some of the vertical at 1000. It does shoot quite well to 600 in the 18 twist.
I'm not sure yet whether to have Steve build another one for me at 1.4 or ask him to take the extra length off the block. More testing in order...
RE: What do we really know about the transonic zone? - Don McDowell - 07-28-2021
As good as this bullet has shot in the 40-70 I want to load some in the 40-90 and give it a run at 1000. It's another one of Brooks original postel nose design.
RE: What do we really know about the transonic zone? - Kurt - 07-28-2021
Don, it's easy enough to chuck it up in a lathe of mill and take a few thousands off under the plate.
RE: What do we really know about the transonic zone? - Don McDowell - 07-28-2021
I sent some to a friend with a 40-82 that wasn't treating him real well, he then wrote back and wanted to borrow the mould for awhile. He cast up enough to shoot a very long time. Will be looking to see how he does with it at a match in a couple of weeks.
RE: What do we really know about the transonic zone? - Don McDowell - 07-28-2021
(07-28-2021, 10:40 PM)Kurt Wrote: Don, it's easy enough to chuck it up in a lathe of mill and take a few thousands off under the plate.
Well yeh if a person has the required equipment. I don't.
Besides it might just be the cats meow in the 110's
