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Mountain Molds • Heavy for caliber 357
Page 1 of 1

Heavy for caliber 357

Posted: Tue May 19, 2015 3:55 am
by Slow and Heavy
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

Re: Heavy for caliber 357

Posted: Tue May 19, 2015 4:18 am
by mtngun

Re: Heavy for caliber 357

Posted: Tue May 19, 2015 1:22 pm
by Slow and Heavy
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.

Re: Heavy for caliber 357

Posted: Tue May 19, 2015 5:56 pm
by mtngun

Re: Heavy for caliber 357

Posted: Mon Sep 21, 2015 10:03 pm
by Grayson
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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Re: Heavy for caliber 357

Posted: Wed Jul 13, 2016 5:30 pm
by charles.k.terry
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.

Re: Heavy for caliber 357

Posted: Wed Jul 13, 2016 7:07 pm
by mtngun
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".