[Ammunition Attrition]

I ordered some 140gr .357 Sierra's to play with using BE-86. I'm thinking 10% under Alliants 147 data might be a good starting point for working up a load. What say you all?

http://www.midwayusa.com/product/28...er-357-diameter-140-grain-jacketed-hollow-point-box-of-100?cm_vc=ProductFinding
These? You really are going off the chart. I wish they made a 140g for 9mm and .357 Sig, too, but...I don't know you but see you've been here a few years but I HAVE to ask just in case and please don't be insulted by the obvious but it's pretty academic: You do know the .357 SIG's actually a .355-.356" dia. barrel, right? I've fired true .356" and .357" dia. in my SIGS and actually prefer them over a .355" true dia. bullet, but those 38cal. Sierra's might be a .358-.359" and it'll be pretty tight so your pressure might be a real concern. I use these and they're very accurate:
http://www.midwayusa.com/product/74...mm-355-diameter-125-grain-jacketed-hollow-point-box-of-100?cm_vc=ProductFinding
been a while since I calipered them but I think they're a .356" dia. Another great bullet is the HAP 125g allegedly in .356 that I've calipered to a real-world .357" and LOVE them.
Hey, let us know 'cause if you like 'em and they're accurate I'll try 'em too. You ain't no Guinea pig but, hey, I'll wait for your report. There certainly are more offerings for hunting in the .38 cal. so I'm curious. P.S. I wouldn't shoot a .359" true dia. in a .355-6" barrel myself so I'd caliper one for sure.

 

[Ammunition Attrition]

0.357 should work just fine. 0.357" works for my 9x19s, and I prefer them.
Alliant lists max loads with statement to reduce by 10%. I usually reduce by 11% for a start load, if I can't find a manual with even lower start loads.

+1
Keep us posted and you may have found a really sweet round but if they're .358-9" I'd wear the welder's face shield and industry gloves like we read about over in the 10mm Reloading threads. Godspeed, Timmay!

 

[Ammunition Attrition]

http://www.glocktalk.com/forums/showpost.php?p=22128501&postcount=62

And it's all in SAAMI spec, no rifle primer needed, .356" dia boolit,
all "on the charts"--the "old" charts that is, the real ones. That's 800X in .357 SIG for you. But 3n37 is more accurate which is more rewarding and to the point. Still, it's nice to know the potential...

 

[Ammunition Attrition]

Thanks for that additional .357 info, Cycletroll. As long as they caliper out to .357" real-world I see no problem. .358" makes me a little leery, but .357 is sweet. **Just calipered my two most accurate bullets out to 50 yards through both factory Sig Sauer and Bar-Sto barrels, the Sierra 125g JHP and the HAP 125g: they measure out to .3565-.357 real-world dia.***

 

[Ammunition Attrition]

Hornady XTP's mic at .3565-.357 and the fattest part is fairly short. I've had no issues with pressure and the slightly tighter fit leads to much better accuracy than i find in most .355 bullets.

CT, I picked up a box of 140g and 158g and they caliper out to .358"dia., which I think is a little tight and will definitely create more pressure than a true .357" measured boolit just because, well, friction and physics. How much? I would NOT load 'em with a max load of any powder, but maybe a light load. And I'd expect my barrel to take on more wear and fouling, though I've been told by a mole that I "won't shoot out your Bar-Stos". Still, I won't shoot these .358" dia boolits through 'em, because I already figured out they like .357" true dia. and I lean overly safe with explosives.
Good news is the Sierra .357/.38cal 140g JHPs I also got measure out to a true .357" dia., and there ain't no boolit more accurate than a Sierra. Just hope they hold up to high-velocity penetration 'cause I'm gonna load some to 1400fps+ and I've heard their labeled ".357 Sig" JHPs (.356" 125g are super accurate) fragment. I expect better with these. Maybe I end up buying one of those old .357 Magnum autos--what, the Automag was .44 Mag, what's the .357 auto?.....