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Jimmy, Remington advises NOT shooting any +P or +P+ loads in the 1911R1 line. Just stick with the Standard loadings.

The 1911 platform runs 38 Super Comp and 40 S&W at pressures considerably higher than 45 ACP +P or +P+ so it should be safe to do but it does require a heavier recoil spring (20 pound spring, the Remington comes with a 16 pound spring) and will accelerate wear. With the 45 ACP it should not be necessary to use +P for self defense. It hits hard enough as it is.

Remington advises NOT shooting any +P or +P+ loads in the 1911R1 line. Just stick with the Standard loadings.