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. Case length is only critical with a revolver caliber roll-crimp die. Published case length is 1.560". 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". Most round nose (RN) 9mm will run better just shy of that, around 1.135". Put a thick line from case mouth to the ogive of your bullet. 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". The difference in length has to do with where in the cannelure the bullet is seated. Of cartridges based upon the .308, it is the second most popular behind only the .243 Winchester. 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. 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. Correctly measuring Case Overall Length. Never found one that was too long, or too short so far. With the longer size, the bullet is seated to the bottom of the cannelure, while yours are seated more toward the top. The use of Hornady's bullet comparator and correct caliber insert will be best to determine your correct bullet seating depth. The 6.5mm Creedmoor (6.5×48 mm), designated 6.5 Creedmoor by SAAMI, 6.5 Creedmoor by the C.I.P. Steve Koski Member. I locked it down the first four were perfect then they started seating shorter between 2.672 -2.678. That is bullet + case. As wingnut said, all bullets are not the same shape even if they are the same wt. I know this is going to sound newbie as all hell would trim case length and or variances in overall projectile length … 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. Joined: Mar 31, 2004 Make sure the bullet is grease and oil free so the thick waxy crayon material will stick. (don't get me wrong, it's good that you're paying attention to detail because that matters in handloading.) rc rcmodel, Sep 7, 2011 #2. Battery and protective storage case included. COL is cartridge overall length or OAL or LOA. The mark should be as thick as the case neck. Someone can correct me if I'm wrong, but I think you should be trimming to 1.75 and not 1.740ish area. Precisely measure case and bullet length, inside and outside diameters, primer pocket depth overall cartridge length and more with Hornady's Dial Caliper. Because new cases are often slightly smaller in diameter than a fired and resized case, some allowance needs to be given for the initial case stretch that can occur when fired in the chamber. 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. 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. Features quick repeat and measuring speed, an extra large LCD screen and accuracy to .001". I do "chamber check" them after loading by dropping them in a pistol barrel or case guage. I set my seating die to my desired length 2.680 for my .243 70gr speer tnt. 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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