Do your 255 gr bullets have a cannelure? My 250 gr RNFP bullets do and the bullet pretty much goes where it goes. No doubt you are going to need to remove the bullets and try again. Hopefully, you didn't reload a huge batch before discovering your OAL problem.
You don't need a drop tube or compression die with 35 grains. For me, 35 grains is the max where I'm comfortable using the bullet as the rammer to compress the powder.
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