@308tikka That is really unfortunate that you don't have enough time to show a video of how you make the easy offhand shots as 100m into a 4" circle. If I don't have my camera stuck to my ear muffs then I get somebody else to film either with my other camera or my Samsung S7.
I think anybody that can shoot offhand with a hunting rifle ie 308 and bigger at 100m into a 4" circle easily would be one of the best rifle shots I've ever seen and I'd be glad to discuss their technique with them. However I realise you are a very busy person so maybe when you have time you could ask somebody to film you and you send me a PM and we work something out.
Just something like this with your mate filming on their mobile phone would be great. Even 5 consecutive shots offhand at 100m into a 4" circle would be outstanding.