Hi Tone, I've used Sniper Light in both calibres - in fact, I'm currently using them in a 30s, which delivers 7.6 ft/lbs and superb accuracy.. Not quite as good as RS in either 99s, but certainly good enough when I'm out of JSBs.
The Lights are quality pellets and well formed in both calibres - very effective against quarry too. They are a little more expensive than JSBs in my neck of the woods, but that hardly matters if they work well. If you like H&N pellets in general, then I suggest you give them a go...