Thank you for the info. After more research it looks like the 2 inches is not going to be much of a gain. That opens up a ton of Options for me! Thanks!Guys quoting speeds out of a Creedmoor that meet or beat a PRC are either over pressure or comparing a unicorn powder to a run of the mill slower powder. All things equal with correct powders for each the PRC will run ~200fps faster.
Just for kicks I did just that on QuickLOAD. Your ABLR 142 will run ~2950 out of a 24" Creedmoor and ~3000 out of a 26" with RL26 (unicorn powder in the Creedmoor). The PRC will run ~3150 out of a 24" and ~3200 out of a 26" with VV570 (unicorn powder in the PRC). Any individual variances from that from chambering, fast vs slow barrels, etc. could just as easily apply to one over the other. Those projections are at near max pressure on both but no over.
I have a 6.5 Creedmoor that I love. I hate to admit it but ended up with one after a few experiences shooting and carrying friends rifles. They just work. That is in a Kimber lightweight hunting rifle. If the weight or loss of a round or two in the mag box aren't an issue I'd do the PRC. If I wasn't building a 300 PRC for heavier stuff, I'd probably do the 6.5 PRC over the Creedmoor.
If it helps, I'd be happy to do a few runs in QuickLOAD for you.