357 maxi load question

[stumped]

I have a sb1 receiver and stock setting around and thinking of a new project. I plan on getting a 357 barrel and reaming to maxi. I have been reading older post concerning pressures issues with the sb1 receiver, and just wounding what are the hottest load you guys using safely and what velocity are you guys getting. I plan on using 158 gr fn-xtps with aa 1680. I have read that some are using 180 gr bullets with 26 to 30 grain of 1680, so that makes me think I could use 158 bullets and 28-29 gr 1680 to get 2300-2400 fps safely. Also has anyone heard what the turnaround time is for the 357 barrel these days.     

[revbc]

You can load the sb1 safely up to max book loads.  Here's the data from accurate's website.  They do show up to 30 grains 1680 for a 180 grain bullet chambered in a T/C.  I never went over the max book load on the sb1.  The below load should be screaming out of a 22" barrel.  Data is for a 10"

1680 158 HDY JHP-XTP 24.5 1,724 27.3 1,912 36,300

Mine was less than 2 weeks getting back.

[jpshaw]

While I haven't reamed my .357 to Maxi yet I do shoot .360 Dan Wesson out of it.  I brought pressure up to where I was near Maxi loads from it but when I tried it on the SB1 Frame it was a bear to open.  That primer flowed back into that large primer hole of the SB1 frame and kinda locked it up.  Moving it back to the SB2 frame solved all those problems though.  As long as you stay with .357 pressures you will be OK on the SB1.

[45-70.gov]

While I haven't reamed my .357 to Maxi yet I do shoot .360 Dan Wesson out of it.  I brought pressure up to where I was near Maxi loads from it but when I tried it on the SB1 Frame it was a bear to open.  That primer flowed back into that large primer hole of the SB1 frame and kinda locked it up.  Moving it back to the SB2 frame solved all those problems though.  As long as you stay with .357 pressures you will be OK on the SB1.

did you use  small rifle primers?


if not you should.....mine had primer problems till  i switched

[YRUpunting?]

If you are going to shoot the Maxi you need to read this site, Steve has done the work for us.

http://357maximum.com/developing-a-load/

158's over about 1800 FPS become basically varmint bullets, they explode on impact.  180 grains and the 357 Maxi are a near perfect marriage.   

[petemi]

This topic has been around a half a thousand times.  SB1 frames with small diameter firing pins such as found on the Talo pistol calibers work fine.  The larger shotgun firing pins usually have problems with hotter loads.  I spend an extra 50 bucks or so per rifle and fit them all on SB2 frames.  End of problem.

Pete

[Dinny]

This topic has been around a half a thousand times.  SB1 frames with small diameter firing pins such as found on the Talo pistol calibers work fine.  The larger shotgun firing pins usually have problems with hotter loads.  I spend an extra 50 bucks or so per rifle and fit them all on SB2 frames.  End of problem.
Pete

+1 'Nuff said.


Thanks, Dinny

[jpshaw]

did you use  small rifle primers?

Nope, just small pistol primers.  Solved my problem by switching to the SB2 frame.

[revbc]

The maxi is made for small rifle primers.

[cudatruck]

I don't care which small rifle primer used, you can still have problems with primer brass flowing back into that large firing pin hole on a shot gun frame. I tried several brands and types of primers, finally gave up and just use it on a rifle frame. Even 357 magnum factory loads had problems on the shotgun frame.

[nanuk-O-dah-Nort]

has anyone tried to reshape a shotgun FP so it fits right, to not allow flow back into the recess?

someone with a lathe, should be able to shape one so it can fill the hole.

on another direction, has anyone tried to bush the FP?

that should not be too difficult to do.

[petemi]

I'm not a machinist, but could you fill the hole in the breech face, re-drill it and install a rifle firing pin?  It sounds simple, but would it work?

Pete

[jeepmann1948]

Short answer is yes. It is one of those projects that the setup time is much longer than the actual work time.A lot of the old single shots were repaired in this manner to fix eroded out holes. Some were bushed and some were welded and re-drilled.For the price of the machine work in a job shop a used SB2 receiver would be cheaper.If you have the equipment at your disposal or a machinist owes you money that is another thing
George

[nanuk-O-dah-Nort]

I did some reading last night, and found that my idea of reshaping is not the answer

seems the ODG's found that the larger the FP, the more backthrust on the FP, causing the FP to set back into the frame, and primer to extrude into the hole.

the answer was a bushed FP hole, and smaller pin, or welded and redrilled with reshaped FP.

I'd think a machinist could do it fairly quickly and easily.

[cwlongshot]

I did some reading last night, and found that my idea of reshaping is not the answer

seems the ODG's found that the larger the FP, the more backthrust on the FP, causing the FP to set back into the frame, and primer to extrude into the hole.

the answer was a bushed FP hole, and smaller pin, or welded and redrilled with reshaped FP.

I'd think a machinist could do it fairly quickly and easily.

For the hasle and $$ its FAR EASIER to just buy a correct reciever...

 Watch the classifieds... I just listed THREE for $75 or less each... Talk to your dealers I have found many who will either just do paperwork because your a good customer OR less than 20$.

CW