|
|
Post by x101airborne on Aug 26, 2022 15:44:29 GMT -5
Kimber Stainless II
Had just a minute on the ranch today to pop off a few rounds. My 180 grain cast lead hollow points shot great. I was pleased with that. Sig Sauer brand 180 FMJ shot real well. Everything was centered. My last magazine to try was a load I made up with data from load data dot com.
180 jacketed soft point .400"
8.4 grains BE-86
CCI 300 LP primer
The load above shot nearly a foot left at 25 yards!! For the life of me, I cannot figure out why!
Does ANYONE have any idea what the cornbread is going on here? The load fed great, extracted and ejected fine. It did seem a little anemic but ok, it is a starting point. I had no trouble centering the target with the other loads, so what is up??
|
|
|
|
Post by smirker on Aug 26, 2022 15:52:34 GMT -5
That is odd....i would look down the barrel, check the lugs and feet for damage as well as the slide stop.
|
|
|
|
Post by x101airborne on Aug 26, 2022 16:08:16 GMT -5
Will do. This weapon only has about 60 rounds through it, but cant hurt to check.
|
|
|
|
Post by x101airborne on Aug 28, 2022 9:30:09 GMT -5
Weapon shows no damage anywhere and the barrel is free of debris. Barely has any powder residue which I did wipe out.
Anyone else ever have this experience? I expect a two or so inch variation, but a foot??
|
|
|
|
Post by contender on Aug 28, 2022 9:49:41 GMT -5
Have you slugged the barrel? It MIGHT give you a clue,, as the bullet may not fit the barrel as well as it should.
|
|
|
|
Post by x101airborne on Aug 28, 2022 10:18:44 GMT -5
No, I have not but all other .400 diameter rounds shoot fine. I will do some more examinating this afternoon.
|
|
|
|
Post by bigbrowndog on Aug 28, 2022 12:43:15 GMT -5
I’d say clean the barrel really well and then shoot the jacketed bullets. Shooting the lead first could have left too much stuff in the barrel, whenever I switch between lead and jacketed I clean thoroughly.
Trapr
|
|
|
|
Post by lar4570 on Aug 28, 2022 15:18:40 GMT -5
Just a thought here, but you said the gun only has 60 rounds through it. Could the sight have wiggled loose and drifted? Just for what ever, I'd shoot some of the original ammo that shot well and see if it's still centered.
|
|
|
|
Post by starmetal47 on Aug 28, 2022 17:21:02 GMT -5
Mic the offending bullet and see what it's diameter really is. I shoot cast from my 10mm and I size the cast bullet so it's larger then the groove diameter.
I've never had and problems in any firearm switching between cast and jacketed. The cast should leave a relatively clean bore. If they are fouling the bore badly with lead you need to check your alloy and lube.
Star
|
|
|
|
Post by x101airborne on Aug 29, 2022 9:21:24 GMT -5
Best I can measure, the groove diameter of my barrel is .400. I cannot measure any better. The cast bullets are powder coated. I ran two mags out and the barrel is squeaky clean. I have not mic'd the bullets I loaded yet, but they are a sure tight fit in the cases when I seat them. No worry about bullet movement during cycling for sure!
|
|
|
|
Post by leadhound on Aug 29, 2022 10:59:43 GMT -5
Did the load group well? Just not centered to the others? I would experiment more, difference of dwell time in barrel, lighting could have changed? A ton of variables could be at play.
|
|
|
|
Post by sixshot on Aug 29, 2022 12:26:58 GMT -5
I would shoot the same 3 loads again & see if you get the same results as the first time. That's very strange to get that kind of change at 25 yds but it almost has to be bullet diameter I would think.
Dick
|
|
|
|
Post by starmetal47 on Aug 29, 2022 13:28:40 GMT -5
That's unusual those powder coat bullet seated really tight because those buggers are amount so of the slickest bullets. In fact when sizing PC rifle bullet in my sizer I though I either had the wrong sizing die or broke the linkage on my sizer they went in the sizer so easily. Also, depending on caliber, they are hard to pick up because they slip out of your fingers. I don't fancy PC bullet, but that's my perference.
If you have any regular lubed cast bullets you can drive one through your barrel from the breech end when the barrel is removed from the firearm and mic it for groove diameter.
|
|
|
|
Post by x101airborne on Aug 30, 2022 12:25:22 GMT -5
Everyone who guessed undersized bullets is right. The one bullet I initially tested was .400. The rest were anywhere from .397 to .400.
Now we know.
|
|
|
|
Post by starmetal47 on Aug 30, 2022 14:16:16 GMT -5
Everyone who guessed undersized bullets is right. The one bullet I initially tested was .400. The rest were anywhere from .397 to .400. Now we know. If you re-powder coat them you can bring them up to .400 and it won't hurt the bullet any. I reckon you need to mic bullets before you load them pardner. Star |
|
