Steve Koski Member. With the longer size, the bullet is seated to the bottom of the cannelure, while yours are seated more toward the top. The mark should be as thick as the case neck. Features quick repeat and measuring speed, an extra large LCD screen and accuracy to .001". rc rcmodel, Sep 7, 2011 #2. The use of Hornady's bullet comparator and correct caliber insert will be best to determine your correct bullet seating depth. Bullet tips vary in length also, so using your calipers to measure from the case head to bullet tip WILL NOT give you a repeatable and accurate measurement. Never found one that was too long, or too short so far. The difference in length has to do with where in the cannelure the bullet is seated. Precisely measure case and bullet length, inside and outside diameters, primer pocket depth overall cartridge length and more with Hornady's Dial Caliper. Because of this allowance, the Manufacturer’s Initial Length will sometimes be slightly shorter than SAAMI minimum length. Make sure the bullet is grease and oil free so the thick waxy crayon material will stick. COL is cartridge overall length or OAL or LOA. Case length is only critical with a revolver caliber roll-crimp die. As these names would suggest, it is the .308 Winchester case necked down to accept 7 mm (.284) bullets with a small increase in case length. Published case length is 1.560". Correctly measuring Case Overall Length. I do "chamber check" them after loading by dropping them in a pistol barrel or case guage. Someone can correct me if I'm wrong, but I think you should be trimming to 1.75 and not 1.740ish area. Max OAL or COL is a SAAMI spec, it does NOT mean that is the length you load to or the length that works in your pistol. If you want to know what a maximum case length is for your rifle either buy a sinclair chamber length gauge or use some "Scratch Cover Crayon". (don't get me wrong, it's good that you're paying attention to detail because that matters in handloading.) I know this is going to sound newbie as all hell would trim case length and or variances in overall projectile length … I locked it down the first four were perfect then they started seating shorter between 2.672 -2.678. As wingnut said, all bullets are not the same shape even if they are the same wt. edited to add that many folks new to the reloading game pour over the manuals and make note of case overall length dimensions and some other details as well, that turn out to be non-issues. It is a modification of the 6.5 Carcano and the .30 TC, based on the .308 Winchester.. Battery and protective storage case included. I set my seating die to my desired length 2.680 for my .243 70gr speer tnt. The 7mm-08 Remington is a rifle cartridge that is almost a direct copy of a wildcat cartridge developed around 1958 known as the 7mm/308. Joined: Mar 31, 2004 Re: minimum 223 brass trim length i think max trim is 1.760 and should be trimmed .01 less which would be 1.75 trim length. Question, I just used my Sinclair Chamber Length Gage Insert on my Savage 6 BR and got a reading of 1.580". That is bullet + case. or 6.5 CM or 6.5 CRDMR for short, is a centerfire rifle cartridge developed for Creedmoor Sports and introduced by Hornady in 2007. Put a thick line from case mouth to the ogive of your bullet. Most round nose (RN) 9mm will run better just shy of that, around 1.135". The Sinclair instructions have a warning that says maintain the case length so that it is a minimum of .024" shorter than the chamber length so that comes out to 1.556". 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