Ian's videos are still a great source of weird stuff, and today I saw for the first time his
video on the SSK .950 rifle. Using shortened and necked-out 20mm Vulcan cases, it's effectively a 24.1x70mm centerfire round fired from an 85.1cm barrel. Only three of these rifles were made and ammunition is accordingly rare, but if you really need to reach out and touch a light armored vehicle, this is the rifle with which to do it. These rifles were built in 2006 and cost $4,000, with each round of ammunition priced at $40. No ammunition has been made since 2014.
SSK .950 JDJ
Wt 50.0 kg, SS, Dam 16, Pen 2-2-2, Blk 15, Mag 1i, Rcl 4 (7 without the 8.2 kg muzzle brake), Rng 278
The prototype has the following changes: Wt 23.0 kg, Rcl 5/8.
This is one of those situations where it might actually make more sense in Traveller as a marksman's rifle for powered armor troopers just because of the sheer mass of the rifle, even the prototype.