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7mm-300WSM wildcat

 
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  #15  
Old 03-17-2009, 10:04 PM
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Re: 7mm-300WSM wildcat

We seem to think alike. I have good luck with 4831sc and h1000. Currently working up RL 17 too. Primers are what is available at this time though.
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  #16  
Old 03-25-2009, 09:53 PM
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Re: 7mm-300WSM wildcat

Well I necked down as we discussed and I got quite a few good cases (< 2-3 thou case runout), and some with VERY increased case runout (10-12 thou even). The best I can see is that the redding comp S type neck sizer does not give quite enough case support on new brass and allows the cartridge to move around in the sleeve loosely. Redding comfirmed this possibility with a phone call. The increased runout started when sizing to 0.333 to 0.329. Using a Forster press with floating die.

My questions are: MBrown, do you notice this effect?

Are there any other dies that might give a little better case support with new brass? Any experience with Wilson dies for necking down new brass?

Fire forming should straighten these up followed by FL resizing, but it would be nice to get them all as close as possible first.
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  #17  
Old 03-27-2009, 05:36 PM
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Re: 7mm-300WSM wildcat

I have not checked the runout on mine. I use a RCBS Rock chucker and the redding comp bushing die with great results at the range.
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  #18  
Old 03-27-2009, 06:03 PM
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Re: 7mm-300WSM wildcat

I just used a Redding Neck Bushing style neck sizing die to drop a 300 RUM case neck to 7mm RUM in a one neck bushing step last night. Before doing so, I started/coned the 300 RUM case neck down to less than .311 with a 25 RUM full length resizing die so that the case neck was able to enter the .311" diameter Redding neck bushing. After that, no problems using the neck bushing to take the 300 RUM case neck down to the 7mm RUM case neck diameter with the single .311" Redding neck bushing.

Other than using a conventional full length sizing die, as I suggested in an earlier post, I don't believe you should expect to get minimal case neck runouts using multiple Redding neck bushings until after you've fireformed your sized down cases in the chamber of your rifle.

But if you use a full length resizing die, then as long as the die is quality & concentric, the wildcatted case should be pretty uniform as it comes out of the full-length resizing die.

I anneal my case necks and shoulders after working them to the extent of sizing down a full caliber.
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  #19  
Old 03-27-2009, 08:38 PM
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Re: 7mm-300WSM wildcat

I knew fire firming and annealing was in the works. I guess I just didn't expect the spread of runout 0.000 - 0.0012. I kind of expected they would have all had similar (i.e. 7 thou) runout. Having a spread of this kind tells me that there is some inconsistency with the die setup and I think I can narrow it down to the loose fitting sleeve within the redding neck die. Sizing down was easy. Overall, I am very pleased with the ammo. Just a few changes to make the steps more efficient. Thanks again
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  #20  
Old 03-27-2009, 09:34 PM
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Re: 7mm-300WSM wildcat

Quote:
Originally Posted by nheninge View Post
I knew fire firming and annealing was in the works. I guess I just didn't expect the spread of runout 0.000 - 0.0012. I kind of expected they would have all had similar (i.e. 7 thou) runout. Having a spread of this kind tells me that there is some inconsistency with the die setup and I think I can narrow it down to the loose fitting sleeve within the redding neck die. Sizing down was easy. Overall, I am very pleased with the ammo. Just a few changes to make the steps more efficient. Thanks again
My experience has been the more the case neck is worked down the greater the neck runouts. Especially with new brass that isn't held tightly in the reloading dies, because the virgin brass is purposely on the smallish size and allows for some additional slop in the dies. I expect you'll be in good shape after the initial fire-forming. I would anneal before I fired the brass in the chamber the first time. At least that's what I do. I like to soften up the work-hardened brass before slamming it out against the chamber walls. I've had some fire-formed brass split when the shoulders were blown out or forward to wildcat cases in the past. Never had a problem if I annealed the expanding portion of the brass first though. Good luck with your project. It sounds like a good one.
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  #21  
Old 03-28-2009, 02:21 PM
mo mo is offline
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Re: 7mm-300WSM wildcat

So if you had a regular 7MM WSM could you neck down 300 WSM Norma brass and fire form them or do you have to have a rifle chambered for the 7mm-300?
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