Hi.
Highpower some uncommon shooting for me, but found this as the program?:
1. Slow Fire, standing - 10 rounds at 200 yards in 10 minutes.
2. Rapid Fire, sitting or kneeling - 10 rounds at 200 yards in 60 seconds.
3. Rapid Fire, 10 rounds prone - 300 yards in 70 seconds.
4. Slow Fire, 10 rounds prone - 500 or 600 yards in 10 minutes.

10 rounds in 60 sec is a bit tough without a speedloader, but is you line up 4 rounds and shot 6+4 with maual 4-last roaund load you probebly manage. I've newer shot with a krag at 500meter,  but putting a groud of lets say round 10"-12" and less is possible with a krag. Do not know how you manage with a M1A with openr sights at 500.
The data of were stationed in 1940 is found in a book telling the history of the krag.
Loading the krag, we do not load harder then 770m/s for 9-9.3 grams bullet.
If the barrel and the bedding is good in your krag (Barrel should not touch wood in the barrel channels), the krag should do at least as good as the M1A.

Rapid shooting with boltrifle in Norway is commonly done in what calleg Stang-shooting. One of the best in this video:   (You need to Login
When we had the krag, the speed were the same as in this video.
Here two norwegian guys shooting their original krag, showing a speedloader in the begining of video:   (You need to Login