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A case-forming challenge (Read 8049 times)

Patrick Chadwick Participating Member Offline Posts: 40 Joined: Oct 5^th, 2020	A case-forming challenge Oct 27^th, 2020 at 4:34pm	Print Post
	Actually, there are 2 challenges. The second one is how to do it, and I shall get round to that in a couple of days. The first challenge, dear reader, is for you! What caliber is it? There are 3 clues: 1) the graph paper has 5mm squares, 2) the case on the left was formed from a "correct" original. However, it was my first try, and 3) the case on the right was formed from a much cheaper alternative -- and the result is better! Have fun! Patrick
	« Last Edit: Oct 27^th, 2020 at 6:04pm by Patrick Chadwick »

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oneatatime Frequent Elocutionist Offline Posts: 3867 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: A case-forming challenge Reply #1 - Oct 27^th, 2020 at 4:43pm	Print Post
	Uh, where's the picture?


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Patrick Chadwick Participating Member Offline Posts: 40 Joined: Oct 5^th, 2020	Re: A case-forming challenge Reply #2 - Oct 27^th, 2020 at 5:32pm	Print Post
	Oooops Now there is a pic. I just don't know why it's so huge. Is there a way to resize it?


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Tom_Trevor assra life no.71 Oldtimer Offline Tom Trevor Posts: 692 Location: Granada Hills Ca. Joined: Jun 16^th, 2004	Re: A case-forming challenge Reply #3 - Oct 27^th, 2020 at 5:37pm	Print Post
	Patrick, Go to resizepic.com and size it to 600x400. Then repost it so all can see it fully.


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830singleshot Senior Forum Member Offline Posts: 404 Location: Texas Joined: Feb 11^th, 2007	Re: A case-forming challenge Reply #4 - Oct 27^th, 2020 at 5:44pm	Print Post
	It looks to me like the 8mm Lebel

	J. Scott McCash&&New Braunfels, TX&&830-237-2376&&jsmccash@yahoo.com
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Patrick Chadwick Participating Member Offline Posts: 40 Joined: Oct 5^th, 2020	Re: A case-forming challenge Reply #5 - Oct 27^th, 2020 at 5:55pm	Print Post
	Sorry about the pic size, I'm still working on it. I think I fixed the pic now. BTW 8mm Lebel is a good start, but look at the base! Use the scaling (5mm) on the paper.
	« Last Edit: Oct 27^th, 2020 at 6:02pm by Patrick Chadwick »

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oneatatime Frequent Elocutionist Offline Posts: 3867 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: A case-forming challenge Reply #6 - Oct 27^th, 2020 at 6:25pm	Print Post
	9.5x47R?


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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 16102 Location: Oregon Joined: Feb 2^nd, 2009	Re: A case-forming challenge Reply #7 - Oct 27^th, 2020 at 7:04pm	Print Post
	8x58R maybe?

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JackHughs Oldtimer Offline Posts: 657 Location: Riverbank Joined: Sep 27^th, 2008	Re: A case-forming challenge Reply #8 - Oct 27^th, 2020 at 10:20pm	Print Post
	8 x 56R Hungarian

	The best lack all conviction, while the worst Are full of passionate intensity. W.B. Yeats
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craigster Oldtimer Offline Posts: 685 Location: lost coast CA Joined: Feb 20^th, 2011	Re: A case-forming challenge Reply #9 - Oct 27^th, 2020 at 10:32pm	Print Post
	oneatatime wrote on Oct 27^th, 2020 at 6:25pm: 9.5x47R? That was my guess. Or 10.5x47R.


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sae Newbie Offline Posts: 6 Joined: Oct 7^th, 2020	Re: A case-forming challenge Reply #10 - Oct 28^th, 2020 at 10:51am	Print Post
	I'm going with oneatatime on this one. 9.5 x 47R Steve............


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hepburnman Senior Forum Member Offline Posts: 402 Location: NJ Joined: Mar 22^nd, 2015	Re: A case-forming challenge Reply #11 - Oct 28^th, 2020 at 1:18pm	Print Post
	Patrick Chadwick wrote on Oct 27^th, 2020 at 4:34pm: Actually, there are 2 challenges. The second one is how to do it, and I shall get round to that in a couple of days. The first challenge, dear reader, is for you! What caliber is it? There are 3 clues: 1) the graph paper has 5mm squares, 2) the case on the left was formed from a "correct" original. However, it was my first try, and 3) the case on the right was formed from a much cheaper alternative -- and the result is better! Have fun! Patrick You might want to take a bit of the mystery out of this and just use a pin gauge or a caliper to measure the I.D. This appears to be about 8mm but you can certainly let us know what it is.


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Patrick Chadwick Participating Member Offline Posts: 40 Joined: Oct 5^th, 2020	Re: A case-forming challenge Reply #12 - Oct 28^th, 2020 at 1:59pm	Print Post
	Well if Oneatatime and Marlinguy got together, they'd have it. It's actually 8x47R (Stahl). It is the immediate forerunnerof the popular 8.15x47R, and uses the same bullet. But it is a blackpowder cartridge and uses the Mauser "A" base that was introduced with the Gewehr M71 and adapted for a wide range of target rifle chamberings that are practically extinct today. The case on the left is one reformed from an M71 case. These cases are expensive, so for further experiments I switched to 45-70 cases - which are plentiful and economic. And as you can see, the 45-70 shapes up beautifully. The only disadvantage is that, because the body is a touch undersized, the formed case has a slight bulge on one side - just about detectable in the foto - and so the case should always be inserted with the same orientation to obtain maximum accuracy. That is no problem with a single-shot block action, where you can see the base as you push in the cartridge. In my next contribution on this theme - probably next week - I will show how I reformed the case, and the on-target results.


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oneatatime Frequent Elocutionist Offline Posts: 3867 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: A case-forming challenge Reply #13 - Oct 28^th, 2020 at 2:07pm	Print Post
	Patrick, now you have to show us the rifle! If for the first fire forming shot you put a narrow wrap of tape just ahead of the rim, the bulge will center the case in line with the bore and you won't have to worry about the orientation.


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Patrick Chadwick Participating Member Offline Posts: 40 Joined: Oct 5^th, 2020	Re: A case-forming challenge Reply #14 - Oct 28^th, 2020 at 5:05pm	Print Post
	oneatatime wrote on Oct 28^th, 2020 at 2:07pm: ... If for the first fire forming shot you put a narrow wrap of tape just ahead of the rim, the bulge will center the case in line with the bore and you won't have to worry about the orientation. Very good suggestion! I will try that next time.


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