Actually I don't see many people using HS Precision stocks outside the varmint/tactical arena. They really don't have much in the way of dedicated target rifle stocks. McMillan has some, but I almost think a person is better off going w/ some form of wood, in that you can get perfectly acceptable stability w/ a good thorough bedding job, but can stil take a rasp or file and 'custom' fit the stock to your body.
Anywho, tell me more about this magazine conversion you are talking about? What I'm talking about is that for the Rapidfire strings, a match rifle (by definition, anything that doesn't look like a Service Rifle i.e. as issued configuration AR15/M1A/M1) has to be able to load, fire, do a magazine change/reload, and fire some more, in a fairly short time span. Usually 10rds total in 60-70 seconds, and normal scheme is 5+5, i.e. two strings of 5rds each, so you normally have to have either stripper clips or magazines that can hold 5 cartridges comfortably, hopefully w/o restricting unduly the OAL of the loaded rounds (which would impinge on the powder capacity). Like I said, the 527 mags already do hold 5rds, but I don't know about OAL. But the 550, which would be nicer to build off of, because you can then get into the cartridges w/ the .473 casehead, such as the .308 Win family (notably, the 6.5-08 Win/.260 Rem), and some of the short 6mm derivatives like the 6mm-.22-250, .240NMC, 6X and 6XC. The possibility of perhaps stuffing a 6.5mm Grendel in a 527 would be interesting, but I'm not sure it would be worth the hassle considering the all around performance of the 6.5-08. Barrel life would probably be a bit better, though, I guess.
Ah, well. Time to get off the soap box. I'll have to draft something up and shoot it off to CZ-USA about some sort of match ready rifle.
Thanks,
Monte