Out of spec MGI .45 Barrel? 458 socom?

[TonyT]

I recently purchased an MGI bolt barrel and GG lower for my SBR. After assembly, I found that the rifle functioned perfectly. I was very happy until I found that at 25 yards the bullets seemed to have a mind of their own. I then shot a few rounds into phone books, and couldnt find rifling on them, although the rifling in the barrel looks fine. I then measured the barrel, and found the grooves to be about .458, and the grooves (lands, sorry) .451. This didnt seem right to me, and doesnt jibe with any of my other 45's. I sent the barrel back to MGI for them to take a look, and they said, "oh yeah, thats in spec, all of our other barrels are like that too.They sent it back, and I got it today. What do you guys think? What do I do now?

Heres a photo of a lead bullet that I pushed into the bore BY HAND


Heres same bullet from muzzle end:


And here are some measurements:

[The Extractor]

I call super BS on mgi. I have an OLY .45 auto upper and I just dropped a .451 dia jacketed hornady bullet on the muzzle and it doesnt even come close to just slipping in. I would measure it but it has a big ole long FH on it.

[The Extractor]

edit, I have a Beretta Carbine in .45 also with no FH here is a pic.

[J-A-R]

What bullets are you using pistol or rifle. Pistol is .452" dia. and rifle is .458" dia. I believe the 458 Socom uses rifle bullets.

[The Extractor]

I think he has a .45 acp pistol round setup.

[J-A-R]

I think he has a .45 acp pistol round setup.

I thought I might have got it turned around after I had already posted.

Thanks

[The Extractor]

eh, it happens. I had to read it a couple times....

[The Extractor]

my dirty beretta measure .435 and .451.