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Pre-fit Lemmon? What’s your thoughts

Shane Lindsey said:
I had a few issues with fireforming and split cases. It was corrected by necking up and back down to create the false shoulder with a slight crush fit and jamming into the lands about .010". Also only a mid range load.

You can't tell until you get formed brass. Once he has that, then you will be able to tell accuracy potential. I tried hard to shoot the big pills (250 Bergers) with it, but it really would not let me, had to shoot light and fast.
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That what I did with my 280ai but I just think what's confusing me is my 223ai was load, shoot, formed cases no problems at all no false shoulder no jamming the bullet but I had a solid smith spin that up for me
 
MagnumManiac said:
You don't use the go gauge on an AI chamber unless that is what you asked for, some have the .003"-.004" negative headspace on the go gauge, others do not.

Cheers.
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Sorry to bother but I am a learner.
The only AI I have been around was my friends 257 Roberts back when we were in high school.(40 years ago) He would buy factory rounds which chambered pretty hard and shoot them to fire form his brass.
I assume this is what you are implying with negative head space?
 
Teekerguy said:
Yup it was a prefit shouldered barrel for tikka actions which to my understanding you cant adjust anyways unless a smith does it. But I did recommend getting the go and no go gauges just to double check but that recommendation was not taken
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I would not be next to him when he is doing range sessions with anything he produced...definitely wouldn't shoot anything he rolled...
 
I read...loaded close to book max for fire forming at 0.010 off lands and didn't use headspace gauges. That is 3 no nos in a row. As mentioned either neck up and then neck down until there is a false shoulder created on the neck giving a crush fit. OR, Jam the bullet, preferably with a moderate crimp. Also, mild to moderate first load and depending on the brass manufacturer, it may be wise to anneal prior to first firing so that the brass flows. Seems like a lot of tomfoolery and mongoonish bafoonery afoot.
 
Sdvldog1371 said:
I read...loaded close to book max for fire forming at 0.010 off lands and didn't use headspace gauges. That is 3 no nos in a row. As mentioned either neck up and then neck down until there is a false shoulder created on the neck giving a crush fit. OR, Jam the bullet, preferably with a moderate crimp. Also, mild to moderate first load and depending on the brass manufacturer, it may be wise to anneal prior to first firing so that the brass flows. Seems like a lot of tomfoolery and mongoonish bafoonery afoot.
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I completely agree with everything you're saying and I appreciate all the reply's. Just wanted to throw this out there and see what others thought. Just trying to help a buddy out and trying different avenues but I'm with everyone on here there's way to many variables of no nos going on at once
 
Deputy819 said:
I don't use BL-C(2) for anything, but from what I've read it isn't the "cleanest" burning powder out there. "I" would let the barrel show you it's accuracy potential on paper after @ 100 rounds or so before deciding on the "lemon" issue solely based on bore-cam photos.
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I use it in my ARs. I can wad up a 30 round mag in 1MOA with my loads.
 
Teekerguy, your friend has some options.

A. send the barrel back with screwed up cases to the gunsmith

B. expand the case necks up two calibers with Hornady or Redding long tapered expanders, then set headspace using the false shoulder that has been created.

Mailing stuff around the country is expensive and somewhat chancy with items getting lost in the mail. Pick.
 
First and foremost get a go/no-go gauges and check headspace. Then if headspace is correct, try loading as described above. If it gauges correctly and still having issues, then send it back to the GS.
 
Had the same thing happen to me on a 223ai tikka prefit. I've done a bunch of prefits and only ever got one bad one, too much headspace. Confirmed with no-go gauge and sent it back. They sent me a new barrel and it's a shooter, done deal.
 
bluedog69 said:
Sorry to bother but I am a learner.
The only AI I have been around was my friends 257 Roberts back when we were in high school.(40 years ago) He would buy factory rounds which chambered pretty hard and shoot them to fire form his brass.
I assume this is what you are implying with negative head space?
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No bother, just giving the facts. Yes, negative headspace is required to stop the above from happening.
I have a 257AI, fantastic little cartridge, wish I had've used a faster twist than 10".

Cheers.
 
sounds like you're in a holding pattern on headspace.

blc2 and 223 never got there for me. A few books recommended magnum primers and that helped get more consistency, and it never performed well at all unless it was at or over book max for me. I won't use blc2 again once I'm through the end of mine.
 
Best grouping i ever had was using BLC-2 powder in a

Steyr Mannlicher .222 Pro Hunter 50 grn v/max virtually through the same hole at 100yds off grass with a Harris 6-9 bipod never done it again though just a one off
 

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