Thread: Stupid Question. bare with me please

Newish reloader, have done alot of study and have had some success..Am reloading for 6.5 creedmoor Tikka T3x rifle, have been getting reloading data off XXL reloading am now looking at the New Hornardy 11th edition.. Am impressed by no.s however I am using Lapua brass and either wind river or federal primers the Lapua brass seems to be quite short 48.5 mil. I am looking at throwing the 147g Eld-m using Alliant 16/26. Hornardy manual says 71.12 mil COAL whereas I have been loading other ammunition to 70.1 mil ( 129 SST) I quess my question is, I don't know the Max cartridge length my rifle can handle, am I safe using the published COAL using different brass/primer as long as I start at the low end? and observe pressure signs ?!?!