ASSRA Forum - Making brass for the 9.3x57R (360)

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Making brass for the 9.3x57R (360) (Read 13266 times)

oneatatime Frequent Elocutionist Offline Posts: 4470 Location: Rocky Mountains Joined: Oct 30^th, 2011	Making brass for the 9.3x57R (360) Nov 4^th, 2018 at 1:12am	Print Post
	Or, the 360 2 1/4, if you will. It's pretty basic. You shorten 9.3x72R brass to 57mm. 9.3x72R brass because it is still available. Huntingdon's has both Norma and RWS. Both are expensive but the Norma is slightly less (and uses a #2 shellholder) so that is what I used. First I cut a short piece of 2x4 to a thickness of 58mm to be used as a jig. I drilled a case neck sized hole through it and then a case base sized hole partially through it so that a case was easily inserted full length being stopped by the rim. A Dremel cut off wheel that looks like a circular saw blade was used to whack off the excess length of the brass. I then ran the brass partially up a 9.3 M die to open up the neck enough to allow the trimmer pilot to enter it easily. The cases were trimmed to length using a Lyman drill press trimmer. The case mouths were deburred inside and out with an RCBS deburring tool. Next the case necks were annealed on my Ken Light annealer. The cases are ready to size in 9.3x72R dies, fully expand with the 9.3 M die, prime and load.


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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 18053 Location: Oregon Joined: Feb 2^nd, 2009	Re: Making brass for the 9.3x57R (360) Reply #1 - Nov 4^th, 2018 at 9:31am	Print Post
	I was at Harbor Fright a couple years ago and saw a mini chop saw for sale. It was under $40, and I had one of their discount coupons too, so got it for under $32. My reason for buying it was to rough cut cases that are much too long. I use a stop clamped to the deck to set length and then just clamp a case against the stop and chop them off quickly. It really works well, and I can shorten a case in seconds. They're $34 now, so with a 20% coupon it's under $30. (You need to *Login* or *Register* to view media files and links)

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oneatatime Frequent Elocutionist Offline Posts: 4470 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: Making brass for the 9.3x57R (360) Reply #2 - Nov 4^th, 2018 at 12:37pm	Print Post
	Thanks, Vall. That's cool. I can put my jig in the vise and off I go. I just printed the coupon and I'll pick one up today.


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oneatatime Frequent Elocutionist Offline Posts: 4470 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: Making brass for the 9.3x57R (360) Reply #3 - Nov 4^th, 2018 at 6:18pm	Print Post
	Picked up the saw and modified my jig to fit in the vise. Just cut off a case to try it and it worked great. A lot less fiddly than the Dremel. Thanks.


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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 18053 Location: Oregon Joined: Feb 2^nd, 2009	Re: Making brass for the 9.3x57R (360) Reply #4 - Nov 4^th, 2018 at 10:34pm	Print Post
	You're welcome Chauncey! I love mine and just used it yesterday to chop off a bunch of .303 British to rework to .40-50SS.

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oneatatime Frequent Elocutionist Offline Posts: 4470 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: Making brass for the 9.3x57R (360) Reply #5 - Nov 7^th, 2018 at 11:40am	Print Post
	60 rounds are all loaded now with various weights of 4227, R7, 4759, or 4198. The load ranges were based on results from my other 33a and a 17c. I forgot that I also wanted to try some H108 but that can wait until the next go round. I painted the front sight pyramid day glo orange and it will now be visible against the ASSRA black sided targets. The fold up leaf sights are 60, 120 and 180 meters (with whatever the factory load was) and have a very fine V notch. Rough on old eyes. Now I'm waiting for an above freezing calm day at the range. Hopefully before Spring;-)


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JLouis Frequent Elocutionist Offline Posts: 10625 Joined: Apr 8^th, 2009	Re: Making brass for the 9.3x57R (360) Reply #6 - Nov 7^th, 2018 at 12:55pm	Print Post
	I have that same chop saw it has worked very well for various small projects. I used it quite a bit for cutting 1/4 inch solid brass stock to length for wind flag pivots. JLouis

	" It Is Better To Now Have Been A Has Been Than A Never Was Or A Wanna Be "
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rkba2nd Frequent Elocutionist Offline Posts: 2102 Location: earth Joined: Feb 16^th, 2009	Re: Making brass for the 9.3x57R (360) Reply #7 - Nov 7^th, 2018 at 1:27pm	Print Post
	I too have used a small chop saw from Harbor freight. Finding it difficult to keep cut square, because of taper and or rim, I use a Wilson case holder to accomplish that. It was long ago that I bought mine, so the new ones may be different, and there was barely enough room for the case holder. If cutting off a large number one could turn down the diameter to fit, but would no longer work in the Wilson trimmer.

	rkba2nd
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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 18053 Location: Oregon Joined: Feb 2^nd, 2009	Re: Making brass for the 9.3x57R (360) Reply #8 - Nov 7^th, 2018 at 1:54pm	Print Post
	rkba2nd wrote on Nov 7^th, 2018 at 1:27pm: I too have used a small chop saw from Harbor freight. Finding it difficult to keep cut square, because of taper and or rim, I use a Wilson case holder to accomplish that. It was long ago that I bought mine, so the new ones may be different, and there was barely enough room for the case holder. If cutting off a large number one could turn down the diameter to fit, but would no longer work in the Wilson trimmer. The Harbor Freight chop saw will cut at an angle if you just clamp the cases in the vise. But the angle is minor, and you're not cutting to exact length, so the case trimmer will easily correct it. I use a small shim on one side to correct the angle sometimes, but it usually is too minor to worry about, and easier to just rough cut the cases.

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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 18053 Location: Oregon Joined: Feb 2^nd, 2009	Re: Making brass for the 9.3x57R (360) Reply #9 - Nov 7^th, 2018 at 2:00pm	Print Post
	Chauncey, I found the Type 33 sights to be less than great also, and never got as good a groups as I felt my gun was capable of. So I did the unthinkable and D&T the top tang for a tang sight. I installed an old Marbles Special Flexible base tang sight and took it back out to shoot. The new tang sight really tightened up my groups, and I'm happy with it now. Still have the option of leaving it folded down if I chose to hunt with it. But the Marbles allows me to shoot out to around 450 yds. when using it. (You need to *Login* or *Register* to view media files and links) I D&T for Marlin 1.125" spacing, so can use my MVA long range on it from a Ballard if I want to try it further.

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rkba2nd Frequent Elocutionist Offline Posts: 2102 Location: earth Joined: Feb 16^th, 2009	Re: Making brass for the 9.3x57R (360) Reply #10 - Nov 7^th, 2018 at 2:19pm	Print Post
	The Wilson case holder works better, try it.

	rkba2nd
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oneatatime Frequent Elocutionist Offline Posts: 4470 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: Making brass for the 9.3x57R (360) Reply #11 - Nov 7^th, 2018 at 4:33pm	Print Post
	I just cut down my wooden jig to fit in the vise and allow a complete cut through of the brass. To get an even cut I added a paper shim of the difference in thickness between the neck and the base of the case under the front of the jig. I had to make a little recess in the top of my jig to clear that little bump on the bottom of the blade holder. No sweat to set up. The jig is locked in the vise and the case just slips in long and slips out short. Yes, Vall, I put a Marbles on my full stocked one with the lowest 17a cut to fit the front dovetail. I used one listed for the old Marlin 39. Could have been a bit taller but I only needed to get to 200 meters. It's set far forward to just clear the hammer and doesn't get in the way of my hand on the grip. Makes it a lot easier on the eyes. If the new rifle looks like it will be a good shooter, it will get the treatment also.


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Smokepole50 Junior Member Offline Posts: 74 Location: Virginia Joined: Oct 21^st, 2018	Re: Making brass for the 9.3x57R (360) Reply #12 - Nov 7^th, 2018 at 6:56pm	Print Post
	I have a model 33 as well in 9.3x57R 360. Very interested in you load development. I have a set of proper dies I lucked into made by RCBS. Thinking about using a NOE .364 bullet that drops around 200 grains. I need to call about the powder but I think Blackhorn 209 might be a good powder to use that will keep pressures low and be much less corrosive that holy black.


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oneatatime Frequent Elocutionist Offline Posts: 4470 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: Making brass for the 9.3x57R (360) Reply #13 - Nov 7^th, 2018 at 8:06pm	Print Post
	Smokepole50, you'd better duck. You'll probably get an earful about calling black corrosive. Also, you know that 33s were made up until 1915 and I'll bet they weren't shooting black then. Besides, using a smokeless powder that has a pressure curve like black and in reasonable quantities why would you need to shoot Blackhorn?
	« Last Edit: Nov 7^th, 2018 at 8:12pm by oneatatime »

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oneatatime Frequent Elocutionist Offline Posts: 4470 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: Making brass for the 9.3x57R (360) Reply #14 - Nov 7^th, 2018 at 8:43pm	Print Post
	Smokepole50, this is the bullet I use at that weight: (You need to *Login* or *Register* to view media files and links) I'm afraid that NOE at .364 would be undersized for the barrel.


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