It could be placed on the end of the bolt shroud.
Back in the days when people had a sense of humour, there was a commonly seen driving safety suggestion. To improve driving standards, and therefore real safety, seat belts and airbags should be banned by law and replaced by a pointed spike on the steering wheel boss aimed at the driver.
Unfortunately, you can't legislate for common sense. I've only ever (thankfully) seen the immediate aftermath of two rifle blow-ups. One was in a 308 Win F/TR rifle where the receiver body failed and was subsequently diagnosed as a materials flaw by the NRA. The shooter's unfired ammunition was taken away by the NRA and subsequently judged to be within safe pressure limits.
The other was a very different case involving handloaded 223 Rem ammunition and an unaltered factory Savage 110 'Competition Rifle', this being 20 odd years ago using the Savage 'long' action and 9-inch twist barrel. The shooter was working up charges in handloads - I can't say what the components were or what weight increments he was using, for reasons that will become apparent. The important point is that a couple of increments short of his heaviest test load, he started to get serious over-pressure indications including that classic, hard bolt-lift. Despite this, he decided to fire the final batch of five rounds with the highest charge rather than take them home and pull them. Despite yet harder bolt-lift with the first round or two in that lot, he carried on - complete common-sense failure - and shot number three or four of the five produced a case failure. The Savage action which is a very good one for coping with escaping gas protected him completely, but the extractor was blown off the bolt-face and gave him a nasty cut on his right eyebrow. If it had struck half an inch lower, he'd have lost an eye!.
To say he was initially understandably shaken is an understatement, and before he gathered his wits, he told his mates what I recount above. Then he took stock and clammed up, refused to answer any more questions, quickly gathered his gear and went home. As no serious injury occurred, no first aid was requested, the incident was never reported and I doubt if the MoD range wardens knew about it. The rifle was (apparently) undamaged once the case was removed apart from the loss of the extractor, was still within headspace specs, and after extractor replacement was bought by a friend who shot it a lot very happily for many years. In my opinion it never shot as well as it should have though and I suspect the chamber was left slightly bulged.
I've also seen rather more incidents that involved unsafe factory ammunition including a complete .22LR case-head failure in an old rifle that gave the user and eyeful of hot gas and carbon particles - painful but fortunately no damage once it was washed out in the nearest A&E. Others involving poor surplus ammo, or in one case Iraqi 7.62 MG ammo that I suspect was recovered off Gulf War 1 battlefields. In every case, the cartridges were either old and/or in very poor condition and were 'bargain buys' where price trumped both quality and safety. the .22LR cartridge was so old it had one of the long gone soft copper cases and failed around half of the rim.
The other factor in this debate is one that nobody has mentioned and is very much within club officials' and the NRA purview - the RO looking out for the signs of people with dangerous ammunition and if necessary telling them to stop shooting and leave the firing point. Both my clubs train and test ROs and part of this 'local accreditation' is the requirement to immediately speak to any shooter exhibiting rifle functioning problems to see if over-pressure is a feature - primarily extraction difficulties and / or the guy who turns his rifle upside down after each shot because the primer is now rolling about the receiver floor instead of residing in the case. The PSSA (Diggle Ranges) rule is two extraction difficulties in a match the RO stops the shooter continuing unless there is a proven extractor problem with the rifle and there are no pressure issues.