I picked up a 1987 ZKK601 .308 last week and finally got out to try it on Tuesday. Only issue I have is if I load 3 rounds, the 1st is quite tight to chamber, the 2nd takes a bit of effort and sometimes jams at an angle when pushing forward if I'm not forceful enough, and the third chambers perfectly.
If I single load then it chambers spot on every time. If I put 2 rounds in the one on the left looking down struggles to chamber ok.
I compared it to my mates newer Howa .204 and his has to slots either side of the raceways that seem to help the rounds clear each other when loading. The Brno doesn't have one on the left side looking down which is where the round gets a bit 'stuck'!
Also it seems like the spring that pushes the rounds upwards is quite taught. If it's exerting too much pressure from below could this be the reason the 1st of the 3 rounds is difficult to load. This should be an easy tweak but I don't want to weaken it if it unlikely to make a difference.
Here's some pics, although they are not as clear as I thought!
Brno 308 with the straight raceway on the left
Howa .204 with the cut out
Any ideas please?