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357 Magnum and gas check

This is a discussion on 357 Magnum and gas check within the Reloading forums, part of the Firearm Forum category; A buddy of mine casted a batch of gas check bullets for me. 158gr SWC. This is the first time I have tried gas check ...


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Old April 27th, 2013, 04:10 AM   #1
 
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357 Magnum and gas check

A buddy of mine casted a batch of gas check bullets for me. 158gr SWC. This is the first time I have tried gas check bullets and wonder if I should load as a jacketed. 16gr of W296 using CCI-550 is my go to load for jacketed. Is this a good place to start?



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Old April 27th, 2013, 04:32 AM   #2
 
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I would look for some published loads for that specific bullet. A gas check will raise pressures just a bit. The 47th Lyman lists 15.7 gr H110 as max for the 358156 GC 155 gr SWC at 1360 fps from a 4 inch.

In my experience, this weight GC bullet works perfectly in the 357 Magnum. Top choice.
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Old April 27th, 2013, 05:51 AM   #3
 
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Thanks.

I'm staring at the Lyman manual right now and see the 155gr. For the 158gr they are listing 18.3gr of H110 max. But I don't think this is a gas check.

My RCBS is showing 17gr max of W296 for their 158gr LSWC.

Gawd this is so confusing...LOL
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Old April 27th, 2013, 10:43 AM   #4
 
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I loaded some 158 gr gas checked TCBB using 12.3 gr 2400 with col 1.587 and medium crimp. They were lame out of my 77/357, dropped like a rock at 100 yards. I will load them using jacked data next time. I didn't chrono them but next time I will.
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Old April 27th, 2013, 11:01 AM   #5
 
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You can use use jacket bullet data for cast lead gas checked bullets of same weight. The lead bullet, even with a gas check will normally have lower friction resistance then the jacketed bullet. The one thing you need to watch is not seating the bullet deeper into the case and causing a spike in pressure due to less case volume.
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Old April 27th, 2013, 11:15 AM   #6
 
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From the Winchester manual.

158 gr. Lead, 296* 14.5 gr., 1560 fps, 38,000cup
158 gr. JHP, 296* 16.6 gr., 1610 fps, 39,500cup

They don't say what primer. Since you are using 550 primers, I'd say back off some from the lead load....maybe 13.5 gr. and work up from there. The above loads are listed as maximum.
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Old April 27th, 2013, 11:18 AM   #7
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Quote:
Originally Posted by MikeyB View Post
Thanks.

I'm staring at the Lyman manual right now and see the 155gr. For the 158gr they are listing 18.3gr of H110 max. But I don't think this is a gas check.

My RCBS is showing 17gr max of W296 for their 158gr LSWC.

Gawd this is so confusing...LOL
Simple start low and work your way up. Whatever gives you the best accuracy then you are there.
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Old April 27th, 2013, 11:45 AM   #8
 
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Lyman has data for their 358156 which is a SWC gas check of between 150 & 160grs depending on bullet metal used. This bullet has been around for a long time & is well tested as is the data.
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Old April 27th, 2013, 11:56 AM   #9
 
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Just my 2 cents.
If any of my reloads are over 1150 fps, I don't
use case bullets, I use Berrys jacketed bullets.
There also is a problem if the alloy is not hard enough,
you will have a leading problems.
Again just my 2 cents.
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Old April 27th, 2013, 12:01 PM   #10
 
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Quote:
Originally Posted by Leadbelly View Post
Just my 2 cents.
If any of my reloads are over 1150 fps, I don't
use case bullets, I use Berrys jacketed bullets.
There also is a problem if the alloy is not hard enough,
you will have a leading problems.
Again just my 2 cents.
Shouldn't have....with gas checks.
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Old April 27th, 2013, 12:10 PM   #11
 
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Quote:
Originally Posted by Leadbelly View Post
Just my 2 cents.
If any of my reloads are over 1150 fps, I don't
use case bullets, I use Berrys jacketed bullets.
There also is a problem if the alloy is not hard enough,
you will have a leading problems.
Again just my 2 cents.
Berry's bullets are not jacketed; they are plated. The copper is much thinner.
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Old April 27th, 2013, 01:28 PM   #12
 
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Talked to my buddy who casted the bullets for recommended 15.5grs of W296. So I will go with that. Thanks everyone!
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Old April 27th, 2013, 08:23 PM   #13
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Consider that a MAX. load, you need to start off by reducing that charge by .7 grs. according to Lyman.
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Old April 28th, 2013, 06:22 AM   #14
 
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What's interesting (and confusing) is my Lyman has 18.3gr max for the LSWC 158gr and RCBS 17gr max for theirs using W296.

My go to load for jacketed is 16gr W296 so figuring 15.5gr is good for the gas check.
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Old April 28th, 2013, 06:39 AM   #15
 
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Different bullets, ctg. cases, primers, & sometime lots of powders, different guns will make a considerable difference in powder charges.
Always start low & work up.
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