How possible is it?
Any more possible in ftr(308)?
Yes - it is possible. However, as you move up the food chain from local to state to regional to national level matches, the competition will become tougher and tougher. If you're willing to spend some money and you know how your rifle/ammunition performs inside and out, it is possible to be competitive and possibly even win matches up to the state and/or regional level. At the national level, I'd say forget it, unless God has directly promised you several favors.
I shot commercial match ammunition in F-TR for several years before learning to reload and did quite well at the local level, and even won a couple matches at the state/regional level. When shooting commercial ammo at the national level, I assumed my appropriate position, somewhere around the top of the bottom third of all F-TR shooters. The higher you go, the tougher it is to be competitive, even with handloads.
The approach I took to using commercial ammunition was to use the best possible ammunition available, with the highest BC bullet available. We're not talking Black Hills, FGMM, or Hornady offerings here. I used the Applied Ballistics 175 OTM Match ammo that was available at the time. Berger has now taken over the Applied Ballistics Munitions, and has added a couple more bullet weights to the mix:
https://bergerbullets.com/product-category/ammunition/?cartridge=308-winchester
The big difference between Berger and one or two other companies that are now doing the same and everyone else lies in the bullets they offer. In a significant majority of factory "match" ammunition, the only bullet choice available is the 175 Matchking. Let's face it, there are much better choices for F-TR. Berger now offers the 185 Juggernaut and 200.20X bullets in loaded ammo, which are the bullets that handloaders are actually using.
There are several keys to getting this stuff to shoot. The rifle needs to be throated properly, as these are much longer bullets than the 175 SMKs and they are not necessarily seated to mag length. You need at least an 11-twist barrel, a 10-twist would probably be even better. Lastly, you need some luck. For anyone that doesn't reload, the only choice is really to test fire commercially available ammunition until you find something that shoots well out of your setup. The same is true for so-called commercial "match" ammunition, except there are a lot fewer choices. So you might need some luck that one of the loads with a good, high BC bullet will actually shoot well in your rifle. I was lucky, the AB 175 OTM stuff shot like a laser in my rifles. The current offerings with 185 Jugs or 200.20X bullets may be a little more finicky. You simply have to try it. Be aware that these loads will likely also be somewhat slower than handloads prepared with the same bullets.
The bottom line is that it's difficult to win in F-TR these days, even at the local level. Any bit of edge you give up means it will only be that much harder, and that your wind calls will have to be that much better than everyone else's in order to post a winning score. Not reloading means giving up quite a bit to your competitors. You can
minimize how much you're giving up if you can find a quality commercial match ammunition loaded with a decent bullet like the 185s or 200.20Xs. But there will still be a disadvantage associated with using commercial ammunition. If I were going to do it again, I'd do exactly what I described above and find something with a decent BC bullet to shoot. However, there is one other important factor...Quality commercial ammunition loaded with high BC bullet is
EXPENSIVE. Making the transition to reloading your own isn't all that difficult and won't cost you much more in the long run than buying expensive commercial ammo.