Check the OAL to the lands and have a competent gunsmith check the concentricity of the chamber. You will probably want to set the chamber back on either due to the "lawyer leade" (long throat). If one has an excessively out of concentric chamber, you will have to set it back more than the other.
I had an SPS-V that wouldn't shoot reliable sub-MOA groups until I had it set back about 5/16" in order to get a concentric chamber. After that, it was a 1/2-3/4MOA rifle.
A friend had an LTR that would get about 3/4 MOA reliably but no better.
I had the SPS-V rebarreled with a 5R takeoff barrel that I had setback about 3/16" to make concentric. Shortened it to 21" and profiled for my can and that tube proved to be a hammer.