357 Magnum revolver problems

[FOTIS]

Hey guys I've got a Smith & Wesson from the performance center it's a 327 8 shot with a 5-in barrel. No matter what loads I have put into it so far it's always very very slow. I tried the 125 XTP with 19.4 grains of little gun and it gave me 1,200 ft per second. It shoots the 158 close to a thousand feet per second. Any idea what's going on cuz this thing's going to drive me nuts.

I've seen huge variations in velocity when it comes to rifles but never ever in a revolver.

 

[salmonchaser]

Forcing cone clearance? Heavy crimp, small pistol magnum primers, and a slow burning powder, not much else to into it. That is a huge drop in velocity. Should be pushing 1500 I should think.

 

[FOTIS]

That's what I thought too....

 

[truck driver]

Got any 2400? That might help speed it up. Coming from the Performance Center the cylinder clearance and forcing cone should be good to go. But now adays you never know coming from Smith & Wesson.

 

[FOTIS]

I don't think so but I do have n110 IMR 4227 and enforcer w296 h110 power pistol and some other ones

 

[salmonchaser]

I do like w296 in my 45 colt. Getting 1300 with a 300 grain hard cast.

 

[truck driver]

296 and H110 worked good IMR4227 too slow.

 

[Slimfinn]

I used h110 for the hot loads in my 357s,

 

[filmjunkie4ever]

I don't think so but I do have n110 IMR 4227 and enforcer w296 h110 power pistol and some other ones

Enforcer basically is 2400, just a touch slower burning. Its what I use in my .357’s easily getting 1200 fps from 158 XTPs

 

[FOTIS]

18 grains of ironmar 4227 and 125 grain XTP yielded 960 ft per second I'm telling you there's something seriously wrong with this revolver and I've never seen anything like it in my life

 

[Guy Miner]

Fotis - have you run any factory ammo through it and over the chronograph yet?

Guy

 

[FOTIS]

No not yet but I do have a 357 pistol pack from Dan Wesson and a 686 Plus from Smith & Wesson and velocity seem to be just fine with them 2

 

[Guy Miner]

Ya, that new one is producing mighty slow velocity for what should be a pretty peppy load.

Wonder what the pressure is doing? How do the cases and primers look? Could the pressure be too low for good velocity?

Dang! A puzzle for sure.

Guy

 

[FOTIS]

I'm going to go check the cylinder gap and check the brass the brass so far look normal but I'll see I'll let you guys know

 

[FOTIS]

Cylinder gap looks normal to me 0.006 of an inch

 

[filmjunkie4ever]

Wow this is a real puzzler. Following with piqued interest.

 

[FOTIS]

Right??????

 

[FOTIS]

I just shot some factory ammo 125 and 158 out of the 5-in 327 and 6" 686 Plus the 686 Plus with one more inch of barrel is yielding a little over 200 ft per second more than the 327

 

[Bruce Mc]

Check groove diameter

 

[FOTIS]

An easy way of doing this???