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Tapered bore Drilling (Read 16126 times)

trapdoor Dick Oldtimer Offline Posts: 557 Location: Newark Joined: Mar 26^th, 2009	Tapered bore Drilling Nov 7^th, 2011 at 1:13pm	Print Post
	Hi Guys, it's been a little while. Will just say meds and let it go at that, I'm back. While not a trapdoor, (am I allowed to talk about something else?) I have a nice side hammer Drilling. Rifle barrel caliber is 8X58R Sauer. The bore starts out at the chamber mouth as .323. It exits the muzzle as .311. I made brass from 9.3X72R Sauer. I'm using some of my 32-40 bullets, 165 to 185. It doesn't appear to be very load sensitive. Might this be because of the taper bore? I've never seen anything similar, bore wise. As far as I can determine, it is not just choked, but is indeed a taper from breech to muzzle. Any thought or ideas. Thanks guys. Dick

	Democracy is two wolves and a lamb deciding what to have for dinner. Liberty is a well armed lamb. - Benjamin Franklin
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frnkeore Frequent Elocutionist Offline Posts: 7650 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: Tapered bore Drilling Reply #1 - Nov 7^th, 2011 at 1:36pm	Print Post
	Hi Dick, welcome back. Are you saying that the bore tapers or the groove or both? What are the bore and groove sizes at the breech and muzzle? Is the twist even or gain? And a picture would make us all very happy Frank

	ASSRA Member #696, ISSA Member #339
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waterman Frequent Elocutionist Offline Posts: 3002 Location: Behind the Redwood Curtain Joined: Jun 9^th, 2004	Re: Tapered bore Drilling Reply #2 - Nov 7^th, 2011 at 2:32pm	Print Post
	There was some interest in tapered bores in Germany in the 1920s & 1930s. Most was military interest, but some of the experiments might have led to an 8 mm tapered bore Drilling. The Germans made some pretty complicated jacketed bullets for sporting rifles.


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38_Cal Frequent Elocutionist Offline Posts: 2255 Location: Montezuma, Iowa Joined: Apr 27^th, 2005	Re: Tapered bore Drilling Reply #3 - Nov 7^th, 2011 at 3:00pm	Print Post
	My Lancaster rifle in .360 2 1/4" BPE is tapered in both the bore and grooves (oval bore) by about .010" breech to muzzle. David

	David Kaiser Montezuma, IA
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trapdoor Dick Oldtimer Offline Posts: 557 Location: Newark Joined: Mar 26^th, 2009	Re: Tapered bore Drilling Reply #4 - Nov 8^th, 2011 at 10:04am	Print Post
	Don't know if my photo skills are up for this kind of pix, but will try. For openers, It appears to be a straight, even taper with equal lands and grooves. with the interest here, I'll dig a little deeper. Dick

	Democracy is two wolves and a lamb deciding what to have for dinner. Liberty is a well armed lamb. - Benjamin Franklin
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Chuckster Frequent Elocutionist Offline Posts: 2311 Location: Colorado Joined: May 15^th, 2008	Re: Tapered bore Drilling Reply #5 - Nov 8^th, 2011 at 10:12am	Print Post
	We have seen taper bores, but how is it done? My only experience is a square bit reamer with a wood backing. The wood wears just slightly from breech to muzzle. Several passes will give a few thousands taper. A springy rifling cutter will sort of follow the bore. This does not seem practical for production. Chuck


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trapdoor Dick Oldtimer Offline Posts: 557 Location: Newark Joined: Mar 26^th, 2009	Re: Tapered bore Drilling Reply #6 - Nov 9^th, 2011 at 8:58pm	Print Post
	I'm working on getting some pictures of the bore, but no promises. I did re-slug the breech, actually did a chamber cast on that end and ran a slug into the muzzle. Same results, .323 at chamber mouth and .311 at the muzzle.I did forget one item when I described it before. The rifling, I'm not sure what to call it, is like a rail road track. Instead of equal lands and grooves, there are two lands in the same width as the groove. Like I said, a railroad track. If I can't get a good picture of the gun itself, I might slug it and post a picture of the slug. You can then see the double land scenario. ANYHOW, it shoots beautifully. I reworked a couple of boxes of 9.3X72R Sauer cases and use my 32-40 lead bullets. Great old gun. Dick

	Democracy is two wolves and a lamb deciding what to have for dinner. Liberty is a well armed lamb. - Benjamin Franklin
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westerner Frequent Elocutionist Offline deleted posts and threads record holder. Posts: 12333 Location: Why, out West of course Joined: May 29^th, 2006	Re: Tapered bore Drilling Reply #7 - Nov 9^th, 2011 at 9:24pm	Print Post
	Hi Dick. Dont know what kind of bore picture you're trying to take. I did these with my digital camera. Messing around one day. Your rifling description sounds like Zimmerman? The two brothers from New York. Zimmerman? Geesh, must be slippin. Cant remember. Zettler! Barny and Billybob Zettler! Joe.

	A blind squirrel runs into a tree every once in a while.
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trapdoor Dick Oldtimer Offline Posts: 557 Location: Newark Joined: Mar 26^th, 2009	Re: Tapered bore Drilling Reply #8 - Nov 10^th, 2011 at 1:15pm	Print Post
	OK Joe I'll try for some pix like that. Did you use a back light? Anyhow, on the top picture you posted, move each of the narrow lands close together in sets of two and this is about it. I'll see if I can find some pictures of the gun itself too. It's really neat. Later guys. Dick

	Democracy is two wolves and a lamb deciding what to have for dinner. Liberty is a well armed lamb. - Benjamin Franklin
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westerner Frequent Elocutionist Offline deleted posts and threads record holder. Posts: 12333 Location: Why, out West of course Joined: May 29^th, 2006	Re: Tapered bore Drilling Reply #9 - Nov 10^th, 2011 at 1:20pm	Print Post
	Lay'd a white piece of paper on the floor for back light Dick. Think my camera was set to Macro, no flash. Joe.

	A blind squirrel runs into a tree every once in a while.
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trapdoor Dick Oldtimer Offline Posts: 557 Location: Newark Joined: Mar 26^th, 2009	Re: Tapered bore Drilling Reply #10 - Nov 10^th, 2011 at 1:57pm	Print Post
	Well Joe, here's something to give you an idea. Thanks for the tips. Times limited right now. More soon. Dick

	Democracy is two wolves and a lamb deciding what to have for dinner. Liberty is a well armed lamb. - Benjamin Franklin
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trapdoor Dick Oldtimer Offline Posts: 557 Location: Newark Joined: Mar 26^th, 2009	Re: Tapered bore Drilling Reply #11 - Nov 10^th, 2011 at 1:57pm	Print Post
	one more

	Democracy is two wolves and a lamb deciding what to have for dinner. Liberty is a well armed lamb. - Benjamin Franklin
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trapdoor Dick Oldtimer Offline Posts: 557 Location: Newark Joined: Mar 26^th, 2009	Re: Tapered bore Drilling Reply #12 - Nov 10^th, 2011 at 2:00pm	Print Post
	the drilling

	Democracy is two wolves and a lamb deciding what to have for dinner. Liberty is a well armed lamb. - Benjamin Franklin
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trapdoor Dick Oldtimer Offline Posts: 557 Location: Newark Joined: Mar 26^th, 2009	Re: Tapered bore Drilling Reply #13 - Nov 10^th, 2011 at 2:01pm	Print Post
	one more

	Democracy is two wolves and a lamb deciding what to have for dinner. Liberty is a well armed lamb. - Benjamin Franklin
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frnkeore Frequent Elocutionist Offline Posts: 7650 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: Tapered bore Drilling Reply #14 - Nov 10^th, 2011 at 2:03pm	Print Post
	That is a very unique rifling style, Dick. Thank you. Frank

	ASSRA Member #696, ISSA Member #339
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