Load Master said:
I would not recommend seating deeper.
So how will OP chamber the rounds to fire?
The listed OAL/COL in the published load data is simply the length used for measuring peak average pressures in the universal test barrel fixture that is typically single action and do not feed from a magazine.
If you are reloading for semi-auto pistol that feeds from the magazine, you not only have to determine the maximum length that will fully chamber without hitting the start of rifling (Max OAL) but also the length that will reliably feed and chamber from the magazine (Working OAL) which can be the same as Max OAL but usually shorter.
If you are using OAL/bullet seating depth that is longer than listed in the load data, you do not need to adjust the powder charges but if I am using shorter OAL/seating depth, I will decrease the start/max charge proportional to the OAL/seating depth reduction (often .2-.3+ gr).
SAAMI max length for 45ACP 230 gr FMJ/RN is 1.275". While SAAMI max will work in various 1911 barrels like SA/RIA and even M&P45/PT145, my railed Sig 1911 XO has very short leade (almost none) and I need to use shorter 1.250"-1.265" lengths (depending on the bulllet manufacturer and bullet's ogive) to fully chamber. For RMR HM RN with shorter nose and longer bullet base, I need to use 1.230" for most of my 45ACP pistols and even shorter 1.200" for Sig 1911.
OP, seat the bullet deeper until the round fully chambers without hitting the start of rifling and function check by feeding from the magazine. If the bullet seating depth is significantly deeper, I would reduce the start/max charges.
If you check the comparison pictures below, factory PMC 230 gr FMJ is not loaded to SAAMI max of 1.275" but to 1.255" while factory Remington 230 gr FMJ is loaded to 1.258" and factory CCI 230 gr FMJ is loaded to 1.270"
