I don't shoot jacketed projos in subs do to many factors, the first being inconsistent bearing surface OD. In high speed w/ lots of pressure that is much more forgiving, not so when dealing with much lower pressure. Now that said, if you are using match bullets at short ranges, yes they will work until the stability issue comes calling. You won't get a match projo to 600yds nose on starting at sub speeds.
I shoot a 217gr cast now in everything 30 cal. As the flight data is the same and they all leave X gun at the same speed, 1080fps
In the 300wm's I use to run a 187gr cast, (lyman 311332)Fed 215 primer 7.3 grs of 700X. I have switched to a 200gr Lyman 3142299 for better sealing but don't have that load data handy, but if memory serves its 8.6 of 700X with a Winchester LR kicking it off. I run that same bullet in the 308s now as well and that load is 7.6 of 700X, and WLR primer, both get to 600yds with the same up (93 moa) but in the high speed guns you also have to add the diff between the two zeros, the 308s are approx 12-13 moa depending gun & the 300's are approx 14 moa. Barrel stiffness, length, can weights are all diff, but easy to KIM per stick. Make sure you use a gas checked bullet design, that way you can toggle between cast & jacketed w/o POA/POI issues.
Using fast burning powders you want to be very careful not to double charge, so load carefully & always inspect before bullet seating.
I have just about stopped shooting high speed anything, as subs done properly, scrack that itch. We ran many sub matchs in years past, and some in some really interesting places that highspeed would never happen.
I also load & shoot the same cast projos at high speed as well. While not match grade they still put meat on the table just as well as jacketed projos, you just have to work a little closer is all. HTH
