The RCBS is marked specifically for that cartridge and is accurate. The part of the gauge that measures base to ogive is a weak link. It is time consuming to use on large batches of sized brass.

The Hornady provides you with quick accurate reference information for base to shoulder and with additional components can measure base to ogive. There are a couple of very accurate ways to establish the needed dimension. You can double up on the bullet comparitor sleeves and measure the bearing length of your bullets.

The Wilson tool is a very good Case OAL tool and base to shoulder reference tool. It does not have a provision for base to ogive measurement. Fast and easy.

243winxb method is adequate for base to shoulder reference only. If you just want to measure base to shoulder with calipers, consider this to get you started.

How deep do you want to go down the rabbit hole?