170s in the 300 BLK?

popper

Well-Known Member
Mostly LEAD. I cleaned it once with patches and ed's red, really dirty then I looked at it with borescope. Then used the choreboy as I saw the small bumps. That is what came out second cleaning. Shot 145 gc'd w/PC and shots were lousy. Then some 170 PB/PC, still lousy. Went & shot pistol. IIRC, soft alloy even for the GC and just pushed too hard. 1:8 twist. Barrel was probably leaded when I started. That patch is from the 2nd cleaning, after choreboy. First was just as bad but no lead sparkles. Didn't get it all.bs.jpg
 
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STIHL

Well-Known Member
Well, be damned we had to talk about leading and cleaning it out. I’m not sure if it was the lead or the PC I pushed behind the lead or if I just got a little too happy with the Keith in the 44, but I spent the better part of the afternoon cleaning some nasty crap out of my 629. She’s shining like a diamond now.
 

CWLONGSHOT

Well-Known Member
I have t ever expereinced any fouling in my guns because of PC.
But My buddys S&W 629 shooting my load of 10g Unique and a 250 KT cast. Showed me my first! It was strange and only moderate. I cast up some harder and softer and it made no diff. I rven tried diff makers of PC. HIS GUN just fouls. Probably a rough bore. I asked him for the gun he said he will just buy jacketed...

So like anything there are always exceptions. But Im pretty sure if you where to clean and then run some Patches with JB that it would dissapear...
 

STIHL

Well-Known Member
@CWLONGSHOT i can’t be 100% sure it was PC with the lead or if the lead stripped the PC off it was definitely lead I had some older Tumble lubed LLA loaded snd i shot them all up. May have caught a couple bad ones in the mix, up to that point I had no issue with my pc stuff after that it got worse. I drove those Keith’s hard I’m taking full tilt magnum hard I’ve got some more and a clean bore so I may be repeating this cleaning process next weekend, but I’m going to find out if the PC are indeed too hot. I intend to 0 my pistol in my hands. Finished my Ransom test tests. Now to get it 0 and get ready to deer hunt with it.
 
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Ian

Notorious member
You guys with 629s that lead, check the barrel right in front of the frame for a bulge. Shine light from muzzle and view through frame opening, if there it will be obvious.
 

STIHL

Well-Known Member
I haven’t seen anything like that @Ian, this gun has shot hundreds of rounds of cast with LLA and never any leading. You could see it 3-4 inches down the barrel and that’s where it started it had to have been a shaved bullet or I just pushed them too hard. Been better if I had known the cause, but it will rear it’s head. If it’s the PC. I’ve got several left that are at book max which should be 1300-1400 FPS.
 
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popper

Well-Known Member
May have shaved some PC when seating. Cleaned the CVA again, got the rest of the speckles out. The ar10 and AR BO were just dirty, no speckles. The CVA barrel is Bergara, assume they use the same blank for larger cals as it is a real chunk. Boyd stock should be in next week.
 

STIHL

Well-Known Member
They get dirty when you out s few hundred rounds through them anyway, mine was due a good cleaning.
 

popper

Well-Known Member
CVA did pretty good with 145gr gc @ 50. Way high on target but decent group ( I can adjust the scope). 170 PB was just too hot a load for the soft alloy, ~13gr 2400. Get to scrub lead again.
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popper

Well-Known Member
Yup, per GRT, 50Kpsi is too much for a soft PB. Would be 1600 fps if it worked. Choreboy cleaning is pretty easy.
 

popper

Well-Known Member
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This is what I shot the last time. 170gr PB had too much pressure for the alloy AND base is way below the shoulder. It's a RD type and the ogive requires seating deep. Works fine @ 1400 fps, no good @ 1600. Base peening, leading last half barrel toward muzzle. Holes are round so stable, just scattergun group. I will try my washer nose sizing next time I cast some so seating is in the neck.
 

STIHL

Well-Known Member
I have got to get back around to this finally got all my brass primed up and read to load last week, ive been working on my 44 mag and a hunting load in a JHP. going to bump the charge up and see if I can stay subsonic and find good accuracy with the 170 and no GC. shouldnt be an issue, i may crank them on up to the 1400FPS range and see what happens, may actually be surprised.
 

popper

Well-Known Member
Reason I changed to the Boyd's thumbhole stock. Plastic one has no meat in the wrist area. Wrist is basically hollow! Plus the boyd's provides recoil more straight back.
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popper

Well-Known Member
CVA with wood stock. 145gr GC PC & 2x BLL test. 2x 10 shot just front bag then 10 with rear bag (BR style). No leading. Exact same load, same alloy cast some day last fall. Also 2 125 sst. Can't figure out vertical, 2" for sst & 5 for cast? No scope adjustments done. Est. 100 fps difference and some BC.
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STIHL

Well-Known Member
That you shot from both bags was a really good group compared to the other 2, wonder if it just doenst like that velovity range, even with the SSt wonder if you back it down a little more and see? Are you shooting them with or without gas checks?