Heavy for caliber 357

Slow and Heavy
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Heavy for caliber 357

Postby Slow and Heavy » Tue May 19, 2015 3:55 am

I would like to have a 215gn RNFP bullet for my 357. Hoping for about 900-950fps.
I have a Taurus 689 with a generous camber(takes backwards 180gr CMJ) and a S&W 627 with shorter chamber. The new bullet would be used mostly in the 627.
This is for Bowling pins. a heavy WC is to slow to load and is near impossible to get a full moon clip filled with WC to chamber at any sort of speed.

Being new to bullet design I am unsure where to begin and what to look out for.
Probably loaded in 38 cases but if it can be done in 357 cases it's fine as well. I have enough of both.
I used recovered range lead. 1/3 cast bullets 2/3 CMJ's

I read on your site that any design can be tumble lubed and not just the "tumble lube" designs.

Great website and very informative
Balthaser - South Africa

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mtngun
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Re: Heavy for caliber 357

Postby mtngun » Tue May 19, 2015 4:18 am

Slow and Heavy wrote:Probably loaded in 38 cases but if it can be done in 357 cases it's fine as well.

357 is not a complicated cartridge. I suggest paying attention to these 3 things:
1) size to the diameter of the throat.
2) the nose length must be able to fit in your cylinder(s.)
3) the front band should stop just short of the beginning of the throat (there's usually a tapered section just in front of the case mouth).

I used recovered range lead. 1/3 cast bullets 2/3 CMJ's

I suggest specifying wheelweight but anticipate that your alloy will drop out a few grains heavier than wheelweight. So if you specified 210 grains it would probably drop out 215 in your alloy -- just a guess, anyway. Also your diameters may drop out a few tenths smaller.

I read on your site that any design can be tumble lubed and not just the "tumble lube" designs.

Based on my limited experience with tumble lube, that has been true.

Slow and Heavy
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Joined: Tue May 19, 2015 3:31 am

Re: Heavy for caliber 357

Postby Slow and Heavy » Tue May 19, 2015 1:22 pm

Thank you for your feed back.
I have played on your design program and come up with this design.

Not sure how else to post the details.
Item # 0.335 nL, 51% meplat, 090_crimp,
.12 x 0.353 straight Gator 9.3mm, 1.0 GtoB, 45 groove: , 5 bands 0.0392 long, 0.88 OAL, 0.07688 ci:

I have added the option for the gas check as it would also aid in the deep seating in the case. The S7W 627 have a very short chamber thus I cant push out to the front. I have some bulged 357 cases on the 180gr CMJ form the deep seating. Would this be a good idea almost like a boat tail but for deep case seating rather than flatter trajectory.

The grease grooves is designed to be somewhere between a traditional lube and a tumble lube.

Your design program is superb and I had lots of fun trying different things.

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mtngun
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Re: Heavy for caliber 357

Postby mtngun » Tue May 19, 2015 5:56 pm

Slow and Heavy wrote:090_crimp,

The 0.045" long crimp would be more appropriate for that caliber. The rule of thumb is that the crimp length should be proportional to the groove depth.

5 bands 0.0392 long

Bands must be at least 0.050" long.

I have added the option for the gas check as it would also aid in the deep seating in the case.

If you are saying that you plan to shoot a gas check bullet without a gas check, I have no experience with that and have heard mixed reports on the subject.

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Grayson
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Re: Heavy for caliber 357

Postby Grayson » Mon Sep 21, 2015 10:03 pm

Yep, as powerful as you can get in 357 mag. Shot in 5" barreled S&W PC327 N frame TRR8. Fed and ejected without issue. Chronoed at 1325fps. Accuracy seemed fair to good, but not excellent in my revolver. only shot paper.


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charles.k.terry
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Re: Heavy for caliber 357

Postby charles.k.terry » Wed Jul 13, 2016 5:30 pm

I'm looking for the same thing a heavy bullet 180 to 200gr bullet. I am concerned about the length of the bullet once seated not fitting in my Ruger GP100. I'm just not sure how to calculate the bullet inside the cartridge overall length of the cartridge.

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mtngun
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Re: Heavy for caliber 357

Postby mtngun » Wed Jul 13, 2016 7:07 pm

Nose length = how much is sticking out of the cartridge.

Cartridge overall length (COL) = nose length + case length.

I've heard that GP100's will take a 1.600" COL ???? But don't take my word for it.

If 1.600" is your gun's limit, then the max nose length will be 0.315".


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