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". Never found one that was too long, or too short so far. Of cartridges based upon the .308, it is the second most popular behind only the .243 Winchester. The use of Hornady's bullet comparator and correct caliber insert will be best to determine your correct bullet seating depth. That is bullet + case. Features quick repeat and measuring speed, an extra large LCD screen and accuracy to .001". 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. I know this is going to sound newbie as all hell would trim case length and or variances in overall projectile length … Someone can correct me if I'm wrong, but I think you should be trimming to 1.75 and not 1.740ish area. Because of this allowance, the Manufacturer’s Initial Length will sometimes be slightly shorter than SAAMI minimum length. (don't get me wrong, it's good that you're paying attention to detail because that matters in handloading.) The difference in length has to do with where in the cannelure the bullet is seated. I set my seating die to my desired length 2.680 for my .243 70gr speer tnt. 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. Most round nose (RN) 9mm will run better just shy of that, around 1.135". 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. rc rcmodel, Sep 7, 2011 #2. The 6.5mm Creedmoor (6.5×48 mm), designated 6.5 Creedmoor by SAAMI, 6.5 Creedmoor by the C.I.P. 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. 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. I do "chamber check" them after loading by dropping them in a pistol barrel or case guage. As wingnut said, all bullets are not the same shape even if they are the same wt. 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. It is a modification of the 6.5 Carcano and the .30 TC, based on the .308 Winchester.. Battery and protective storage case included. Precisely measure case and bullet length, inside and outside diameters, primer pocket depth overall cartridge length and more with Hornady's Dial Caliper. COL is cartridge overall length or OAL or LOA. 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. Put a thick line from case mouth to the ogive of your bullet. Steve Koski Member. Case length is only critical with a revolver caliber roll-crimp die. I locked it down the first four were perfect then they started seating shorter between 2.672 -2.678. Question, I just used my Sinclair Chamber Length Gage Insert on my Savage 6 BR and got a reading of 1.580". Correctly measuring Case Overall 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. With the longer size, the bullet is seated to the bottom of the cannelure, while yours are seated more toward the top. Published case length is 1.560". Make sure the bullet is grease and oil free so the thick waxy crayon material will stick. 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