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Next Sin Cartridge?

 
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  #15  
Old 07-15-2011, 02:02 PM
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Re: Next Sin Cartridge?

Quote:
Originally Posted by Trickymissfit View Post
I think a move in the other direction might be even more interesting. Perhaps a .458 or .416.
gary
Thanks everyone, it sounds like the 6.5mm will be next, I do plan on a 270 too.

btw there will be at least one 458 Sin made some time, I have wanted one for a while now.
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  #16  
Old 07-15-2011, 04:36 PM
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Re: Next Sin Cartridge?

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Originally Posted by sinarms View Post
Thanks everyone, it sounds like the 6.5mm will be next, I do plan on a 270 too.

btw there will be at least one 458 Sin made some time, I have wanted one for a while now.
When and if you head into dangerous game calibers, you may have to work with a good bullet manufacturer for a bullet that holds up well when going thru thick and tough bone / tissue. I've seen bits and pieces of .460 Weatherby mags that came apart on Buffalo (.416's as well). Might also think about a .470! And one hell of a shoulder pad!
gary
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  #17  
Old 07-15-2011, 05:30 PM
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Re: Next Sin Cartridge?

What kind of powder capacity behind the 6.5 are you thinking? There is a long thread on here about my 6.5mm Voodoo, a 6.5-300 win mag. A very simple, extreme performance wildcat, uses all factory dies. I would strongly advise against going even larger in case capacity. There is almost nothing to be gained before bullets start coming apart.
My new load runs 3389fps with 72.5gr of Retumbo behind a 140gr Berger hunting VLD through a 1-9tw 28" mcgowen barrel. I didn't hit any pressure signs, but velocity almost stopped increasing. From 71.5 to 73gr Retumbo, the total ES was less than 25fps. It is a very stable load.
At least in my opinion, with my own personal experience i feel this is the upper limit of useful 6.5mm case capacity, i doubt barrel life will be more than 600-750 rounds depending on usage with this wildcat...
In hindsight i should have gone with a 7mm, i believe that is a much better match of powder to bore ratio. The ballistics don't lie, while 17 3/4moa to 1000yards from a 100yard zero is cool, in the end it's wind drift that is the determining factor in true long range hunting/shooting, assuming accurate ranging of the target...
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  #18  
Old 07-15-2011, 06:43 PM
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Re: Next Sin Cartridge?

Oliveralan, I have read your voodoo thread, I saw your posted speeds and everything. The 6.5 Sin will be the same or maybe a touch better than the 6.5mm STW. I am not a big fan of the belted case so if I make a wildcat it won't be on a belted case. Barrel life is no big deal to me as I can throw a new tube on any time I feel like or grab one of the many other rifles I have.

The 6.5 Sin will have ~15grs more powder capacity than the voodoo so I will be able to hit the same velocitys a lot easier as I and others have suspected are dangerously high out of your rifle and I wouldn't count on getting that out of another one.

Again my cartridges aren't for everyone but they are for some.
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  #19  
Old 07-15-2011, 07:34 PM
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Re: Next Sin Cartridge?

Sinarms, I'm with you, i'm also not a huge fan of belted cartridges. Just built what i did because i had dies, brass and powder lying around and wanted a new project.

15grains more powder than the voodoo.... wow! while it should be interesting, i seriously doubt you will even get 100fps more than my voodoo, all other factors being equal. Simply because there are not many powders that are much slower than what i am already using, as well as the available long range jacketed bullets not being able to withstand such launch speeds. I have no doubt that i'm at the upper edge of what the bergers will tolerate, and i believe that's largely due to the slower twist rate of my barrel, and relatively low round count (no harsh firecracking).

The second paragraph and last statement are extremely similar to Kirby Allen's posts on my voodoo thread. I have 6 firings on all my brass in the mean time, and primers are still coming out round, and new ones sit snugly.... I am not pushing the limits with my 3400fps load at all, i can go 150fps faster with US-869 (would recommend this for your 6.5 Sin, it was able to produce the best velocities for me) but needed 10grains more to do it in the voodoo.

The whole argument about being able to match the velocities produced with lower pressure is a moot point. Your talking about 15grains more powder!! If you were improving the 300 win mag case, or using a 300 wby case, and adding a few grains, ok that's the same velocity with lower pressure... such as the .284 shehane vs .284 winchester, but your saying you want to jump right to a 7 RUM (illustrating my point only). A caliber that requires custom dies, and (assuming your using dakota cases) very expensive brass....

i agree, and i definetely see a nitch for a magazine compatible 338 round like your 338 sin, it's like the 338 norma but utilizes a smaller boltface. Not quite sure what that and a huge 6.5 has in common as you just specified that "your cartridges" are "for some".

Just offering my opinions and responding to your post, not by any means telling you not to develop the round, intellectually i'm interested in reading about it's progress, i just don't see a huge demand for a round like my voodoo, and even less for a larger 6.5... Something i've been wanting to do is a scaled up version of the 6BRX in 7mm or .30cal... that would be really interesting, or use that voodoo+15 grains to make a large 7mm, or 30cal. I just feel past 7mm your really into the negative as far as cost/benefit is concerned, ballistically speaking.

Oliver
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  #20  
Old 07-15-2011, 07:53 PM
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Re: Next Sin Cartridge?

Actually by case design of the Sin cartridges I will be using a faster powder than you do. I am looking at reloader 22 as one of my starting powders. The 338 Sin uses powders like Reloader 19. And by using faster powder I will be able to have a shorter barrel. I will probably have a 24" or 22" barrel to test with.

I will be looking at using the wildcat bullets and others that have a higher BC and can handle the HP.
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  #21  
Old 07-15-2011, 08:52 PM
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Re: Next Sin Cartridge?

Could always do a 9.3 Sin ;)

Gary
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