So are you guys measuring powder out and throwing charges to .1 grain? This is for the guys with the FX and auto tricklers. Or are you measuring to .0x?
I measure powder to approximately 1/2 kernel, maybe a tick less. It's not difficult if you have a good MRF balance. Some may find an auto trickler useful, but it's not essential as you can easily trickle single kernels by hand. Weighing powder to that level of precision is definitely more than you need for F-TR, but then you never have to worry about charge weight variance while on the line shooting.
I'm also going to take a different view about the rifle versus reloading than Damon. IMO - the difference between a 0.50 MOA setup and a 0.25 MOA can very easily have something to do with the reloading/load. Certainly, you have to have a rifle capable of shooting quarter MOA groups, but you also have to know how to arrive at a precise and consistent tune with your loads or the total package will never perform to its maximum capability. Shooting 5-shot groups consistently under 0.3 MOA with an F-TR rifle requires that
everything be right, both the rifle setup and the load. As far as the load, that means good brass, properly prepped with very consistent neck tension, precise charge weights, uniform bullets, and primers that are properly matched to your powder, bullet weight, and case capacity.
As far as using a .22lr as a training tool, I have one, and am not fully convinced of its usefulness as an F-TR training aid. A couple years ago I purchased a CZ455 Varmint Precision Trainer in a Manners T4 stock specifically for use as an F-TR practice tool. Other than weight, it was pretty similar to my F-TR rifles. In order to get it to shoot to my satisfaction, I ultimately had it re-barreled with a 3-groove Benchmark barrel and a Lilja Match chamber, and had it properly bedded. I adjusted the factory trigger to ~1.2 lb, which is only slightly heavier than my F-TR rifles, which are set at ~14-15 oz. I also slapped a NF 12-42x56 BR scope on it. After all these modifications, the rifle will consistently shoot half MOA (or slightly better) groups with Eley Tenex ammo at 100 yds off a bipod under minimal wind conditions. Even though the Eley Tenex isn't cheap as far as rimfire ammo goes, it's still way less expensive than a comparable number of handloaded centerfire rounds, especially when you include the time involved in the reloading process.
IMO - there are two noticeable differences between my .22lr setup and my .223/.308 centerfire F-TR rifles. The first is that the barrel dwell time of the relatively slow .22lr match ammo (~1050 fps) is much longer than is found with a typical F-TR centerfire cartridge. You literally have to hold the scope absolutely still on the POA much longer until the bullet clears the bore or you will throw the shot off. This is not in itself a
bad thing, just noticeably different. The second difference as Jeremy and Brad mentioned above is the almost complete lack of recoil. It is even markedly less than a .223 F-TR rifle shooting 90s. If you practice too much with a rimfire rifle (or a .223) and then pull out your .308 with 185+ gr bullets, your ability to manage the recoil properly will very likely suffer. Perhaps this also depends a lot on the individual shooter; for me it was an issue. My take on this idea is that if you want to practice with a .22lr or even a .223, but routinely shoot a .308 in competition, then most people will also need to shoot and practice with the .308 on a regular basis. Too much (or even exclusive) practice with the lighter recoiling calibers may cause you problems with gun handling after switching back to your F-TR rifle. So it can certainly be done, just be aware of the possible issues with too much practice using a setup that may be markedly different than what you actually intend to shoot in competition and adjust your practice regimen accordingly.