As with any mass produced item, quality varies a bit lot# to lot#. With the component bullets that come from Midway, I've seen as many as three different lot productions in one box of 100 (Some .30/30 150gr RN's). There were three decidely different looking "noses" on the bullets. Some were perfect, some were oddly shaped, and several had small "hollow points" where the core-punch left a small dimple in the point of the bullet.
All however were typically accurate and performed as expected.
Although not often "match grade accurate" as Sierra'a and Nosler B.T.'s ususally are, they are most always decently accurate.
I've had especially good luck with the Corlokt's intended for the .30/30 and .35Rem. For these two cartridges, there is simply nothing better. Including the new Hornady FTX's within 200yds.
I've never experienced core seperation from the Corelokts, but have heard of it. But, recovered game was very dead....!
I've got a quantity of 180gr CoreLokts that I bought in a quantity of 500. Theyv'e excceded the accuracy of Sierra MatchKings and GameKings in four different "hunting" grade .30's I've tried them in. Particularily a .300RemUltMag, where I've shot two deer deliberately at deep angles to see if they will seperate/fail. Neither of the two bullets were recovered and no jacket's, either. Deer were DRT, obviously.
But, THEY AIN'T CHEAP ANYMORE !!!! Cost is ususally within a dollar/100 of premium bullets such as the Sierra's and Hornady's.....
BTW: the 50.0gr load of IMR4064 w/150gr CorLokt is my Savage M110 LH's favorite load. But, it Chrono's at 2,950fps from MY rifle. This rifle won't take even 51.0gr w/o sticky extraction and cratered primers. It will shoot MOA with the mentioned load however. It has the tightest chamber and shortest throat on an '06 I've ever seen. The Remignton CorLokt seated and crimped to the cannulure is .035" off the grooves, and is where the gun "wants them". Who'd thought it ???