Turning .284 brass into 450 brass?

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Re: Turning .284 brass into 450 brass?

Postby Hoot » Thu Jun 30, 2011 4:22 am

Siringo wrote:What about the rim diameter and groove diameter as compared to Hornady 450B brass?


That's an excellent question John since I'm going on about the other dimensions. All of mine are cut down to Bushmaster's requirement as opposed to spec, so I can not A/B them.

.284 Winchester Spec
.4730....4090
Rim.....Groove
.4685....4090
.4690....4080
.4700....4095
.4690....,4100

Weird eh?

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Re: Turning .284 brass into 450 brass?

Postby pitted bore » Thu Jun 30, 2011 10:56 am

BD1 wrote:The brass I made in 2009 was a mixed bag of used .284 and 6.5-.284.

If the 6.5-284 brass from Lapua, Hornady, and Norma (& Nosler?) is tossed into the mix of variables to worry about and sort out, one could be easily arrive at strait-jacket city ready for a padded cell.

Here's a good review of the other 284 brass from a benchrest site by an author that appears to know something about the subject: 6.5-284 Cartridge Guide

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Re: Turning .284 brass into 450 brass?

Postby Siringo » Thu Jun 30, 2011 12:55 pm

Hoot wrote:
Siringo wrote:What about the rim diameter and groove diameter as compared to Hornady 450B brass?


That's an excellent question John since I'm going on about the other dimensions. All of mine are cut down to Bushmaster's requirement as opposed to spec, so I can not A/B them.

.284 Winchester Spec
.4730....4090
Rim.....Groove
.4685....4090
.4690....4080
.4700....4095
.4690....,4100

Weird eh?

Hoot


My 284 cases groove diameter measures the same as you have above. However, the Hornady case groove diameter measures .396 to .399. Therein arises the issue of breaking extractors -- it drags across the locking lugs during extraction and can break off. I had significant drag marks and stopped using the 284 cases until I could find an efficient way of re-cutting the groove and base diameter.
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Re: Turning .284 brass into 450 brass?

Postby BD1 » Thu Jun 30, 2011 3:19 pm

Hoot,
I'll trade you 50 of mine even up for once fired Hornady to give you some to play with.
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Re: Turning .284 brass into 450 brass?

Postby Stealthshooter » Fri Jul 22, 2011 10:46 pm

Siringo wrote:If you shoot .452" bullets, not .450, .451 or lead that can be squished down, the inside of the cut down brass has to be reamed . It is easy to do with a Forester Case Trimmer. When I cut the brass down,trimmed, ect, I sized it in the Hornady die. After that, I reamer the inside to a internal diameter of .446 inches. I had Forester make me a reamer to the size that I wanted. In doing so, the inside case wall thickness is now the same as the Hornady brass (after sizing, but before expanding) -- for at least a 1/2 inch.

The other way to do this is to use undersized bullets, fire the brass, then ream the inside neck to .452 inches or .453 inches. Either way gets you to the same point. It is just easier to do it during the initial preparation.

The whole idea -- IMHO -- it to make a case that duplicates factory, to minimize hassles in reliability with the reloads.

Also note that powder charges need to be reduced because of the small internal volume of the 284 case and the overall case may not seal well in the chamber.

I came to the conclusion that if all went to hell and I could not find Hornady loaded ammo or brass -- my fall back would be using 284 cases. But as a general rule -- to me it is not worth the hassle.


Does anyone know if the forster reamer has the right diam shank to fit in a Hornady case trimmer?
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Re: Turning .284 brass into 450 brass?

Postby Hoot » Sat Jul 23, 2011 6:40 am

Stealthshooter wrote:Does anyone know if the forster reamer has the right diam shank to fit in a Hornady case trimmer?


Same question, but RCBS Trim Pro.
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Re: Turning .284 brass into 450 brass?

Postby BD1 » Sat Jul 23, 2011 11:50 am

I have a Forstner trimmer and an RCBS trimmer, the pilots and reamers are not interchangeable. I don't know about the Hornady.
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Re: Turning .284 brass into 450 brass?

Postby Hoot » Sat Jul 23, 2011 3:23 pm

BD1 wrote:I have a Forstner trimmer and an RCBS trimmer, the pilots and reamers are not interchangeable. I don't know about the Hornady.
BD


Can a Trim Pro shank holder be adapted simply by enlarging the hole? I assume the issue is shank size?

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Re: Turning .284 brass into 450 brass?

Postby BD1 » Sat Jul 23, 2011 8:15 pm

I'll try and remember to look tomorrow as I don't recall which is larger.
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Re: Turning .284 brass into 450 brass?

Postby NID450 » Tue Feb 13, 2018 3:49 pm

Realize this post is a little old, however a lot of questions as I put my 450 together (AR Platform). I do have a little experience reloading and understand head spacing problems with a straight walled case. It has been mentioned in other posts that most manufactured brass is less than the spec for the cartridge, e.g. Hornady brass runs around 1.65” and Starline Brass runs a little longer but still not to the spec of the 1.70”. Then this leads me to why not use the parent case to make 450 brass, .284 Winchester, but it is sounding like a nightmare reaming, turning, squeezing down bullets, broken extractors etc.... The first of many questions is just suck it and accept that you won’t ever properly headspace unless you posses a small fabrication shop?

When I load (sane) for a 40 SW and 9mm I measure a few cases call it good, jam a primer, pour powder, mash in a bullet, pull trigger, bang, hole in paper, approach the 450 with the same attitude?

On a lighter side excited about the thumper!!!!
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