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Author Topic: 357 Max Concerns  (Read 1082 times)

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Offline kng

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357 Max Concerns
« on: January 16, 2011, 08:58:29 AM »
I have considered going Maxi.  I have some concern with the pressure limits on the SB1 receiver.  I know this has been discussed a million times, but I've never seen anything that says an SB1 receiver is rated up to XX,XXX PSI.

For discussion, SAAMI's recommended maximum pressures for a few rounds are:

357 Magnum - 35,000
357 Remington Max - 40,000
44 Remington Mag - 36,000
30-30 Winchester - 42,000 (I beleive there were some SB1 factory receivers back in the day, but no longer.  I could be wrong about this).

Am I looking at this wrong?  Please be easy on me...  ;D

thanks,
-Kyle
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Offline kng

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357 Max Concerns
« Reply #1 on: January 16, 2011, 09:01:53 AM »
...and the 445 max pressure is 43,300 PSI.
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Offline cwlongshot

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Re: 357 Max Concerns
« Reply #2 on: January 16, 2011, 12:31:05 PM »
I have had a original 357 maxi for many, many years and many many hundreds of rounds. Not a lick of troubles. I that time I have probably shot 3-4 boxes of factory Remington ammo and the remainder my own hand loads. I would not hesitate for one second to shoot a maxi on a SB 1 receiver.

If its troubling you DO NOT DO IT, simple as that. Get a SB2 receiver and stop worrying.

CW
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Offline quickdtoo

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Re: 357 Max Concerns
« Reply #3 on: January 16, 2011, 12:39:18 PM »
Kyle,

There are a few details missing from your analysis, the 44 mag has a much bigger case head than the 357 mag/max, .457" for the 44mag, vs .379" for the 357s, and a higher SAAMI MAP(max average pressure), frame strength for the SB1 frame is fine for the 44mag as determined by H&R, so it's not a problem for the smaller 357 Maxi round with any sane load. The formula to calculate breech force is pressure x Area = Force, you need to calculate the area of the case head X Chamber pressure, this is what Johan Loubser, the ballistician for Accurate/Ramshot Powders, uses to determine breech force.

The 445 isn't a SAAMI rated cartridge, but the data available puts it at a max operating pressure of 43.3 kcup, not PSI, big difference in that CUP and PSI are not the same way of measurement, but I think the old SAAMI MAP for the 44mag was 40kcup, which is likely comparable to the 36kpsi they currently use.

Tim

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Offline Lon371

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Re: 357 Max Concerns
« Reply #4 on: January 16, 2011, 12:49:34 PM »
 This may also help. Found this and couple others in the FAQ.

http://www.gboreloaded.com/forums/index.php/topic,183419.msg1098896739.html#msg1098896739

 If you do not go max, you will be missing out. But like CW  said, if it troubles you do not do it. You are the one pulling the trigger.



Lonny
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Offline kng

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Re: 357 Max Concerns
« Reply #5 on: January 16, 2011, 01:20:42 PM »
Thanks for all of the inputs.  (And thanks Tim for splitting my post out).

I've definately decided on doing a 357 Max, I just haven't decided how.  I've been doing a lot of stock/barrel swapping lately, and maybe I'll come up with a good receiver.  Also, it's not that I don't trust what everyone is doing (I realize there are at lease 52 people that have used the reamer), it's like Lonny said, I'm the one pulling the trigger.

thanks!
-Kyle
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Offline yoteskinner

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Re: 357 Max Concerns
« Reply #6 on: January 16, 2011, 02:08:27 PM »
SB1 has a bigger firing pin and firing pin hole than the SB2. What I noticed was primer extrusion long before I got anywhere near a max pressure load. I sold my SB1 receiver and bought an SB2. Then no worries at all.
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Offline yoteskinner

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Re: 357 Max Concerns
« Reply #7 on: January 16, 2011, 02:09:57 PM »
Forgot to mention. This was with rifle primers.
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Offline quickdtoo

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Re: 357 Max Concerns
« Reply #8 on: January 16, 2011, 02:23:32 PM »
Factory 357 and 44 mag SB1 frames have rifle firing pins, so that's not an issue for Kyle since he's buying a new Talo Trapper.

Tim

Quote from: kng on January 16, 2011, 07:17:10 AM
Nice!  I just sent a receiver to H&R to hopefully get a Talo 45-70 barrel mounted to.  I also plan to order a 357 Talo from my local gun store tomorrow. 

Post some pics if you get a chance.

thanks,
-Kyle

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Offline cwlongshot

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Re: 357 Max Concerns
« Reply #9 on: January 16, 2011, 02:52:08 PM »
Quote from: yoteskinner on January 16, 2011, 02:08:27 PM
SB1 has a bigger firing pin and firing pin hole than the SB2. What I noticed was primer extrusion long before I got anywhere near a max pressure load.

WELCOME Yote skinner!!

Anyway, as Tim pointed out, not all SB1's are large firing pined!!  Also, the large pin isn't always a problem....



The larger pin is obviously fired from a shotgun frame. It was a 2200+fps load with a 180Gr SSP bullet. Primer flow as well as flatness is NOT and never has been an accurate indicator of pressures.

CW

CW
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Offline yoteskinner

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Re: 357 Max Concerns
« Reply #10 on: January 16, 2011, 03:38:28 PM »
My mistake. I didn't want to see someone go through the troubles I had when setting up my Max.
CW, what recipe are you using for the 180s?
Just loaded some 180 SSP in front of 30 gr of AA1680. Also changed my stock and forend to the Handi Grip.
Case sooting disappeared and got a 4 shot group that could be covered by a quarter at 105 yds.
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Offline Spanky

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Re: 357 Max Concerns
« Reply #11 on: January 16, 2011, 04:46:40 PM »
There is at least one person on the site (Mac11700) who knows how much pressure the SB1 frames can handle but for some reason the info. is being held secret from the rest of us. :-\
Maybe you can PM him and ask for the info. but I doubt you'll get it out of him.



Spanky
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Offline petemi

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Re: 357 Max Concerns
« Reply #12 on: January 17, 2011, 03:49:25 AM »
Frankly guys, I don't understand the rhetoric and squeamishness about the SB1 frames.  The answer is simple, spend an extra fifty bucks and put it on a SB2 frame......end of problem and discussion.  All my centerfire rifles are on SB2 frames.  The Huntsman is going on one next.......does it neeed it....NO, but I'm happier that way.  Just an old "better safe than sorry".

Pete
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