Just enough to keep my game up. Dry-firing is probably the best for positional training.
I might shoot 250 rounds/year out of my Garands and another 250 out of my M1A. 120 out of my 03a3. I haven't picked up my WOA AR-15 this year. It's been a great year....more CMP matches. I enjoy this vintage rifles much more. My M1A included. Shoot all the reduced matches with my NM and SM M1A.
Most of my marksmanship training consists of using a Mossberg M44US in all the positions, with an emphasis on sitting and offhand. Prone doesn't need to be rehearsed as much b/c it is so well supported. It's all natural point of aim and trigger control. Sight alignment is easiest in the prone position.
I'm sure ammo pricing has a lot to do with the lower round count. Most improvement was dry-firing and shooting hundreds of rounds of 22LR. Learn when to break the shots and find a stable offhand position. Matches are won and lost in offhand.
There is a decline in concentration if your range trip involves too many rounds. Maximum concentration is necessary for improvement. Try and put every one in the X-ring. When you pass that point it's best to just go ahead and plink some or call it a day.
My shooting mentor told me to never exceed 60-80 rounds in a trip. I believe it was sound advice.
After you learn the ropes it's all about the mind game, the mental aspect. Concentration and having the discipline to avoid bad shots separates the mediocre shooter from a great one.
Good luck....sorry if sounded any bit like a lecture, but I sure appreciated others telling me this stuff. Saved me money on ammo, barrel wear, etc. and I improved quickly.
After a while it's kind of like riding a bike. You just figure it out and the match routine becomes effortless. You perform your best when calm and relaxed. Don't forget to breath!!!!
Hold 'em hard fellas.....