Straight-walled rifle cases with no taper such as .45-70 Government sealed very well in their chambers and the tight fit and relatively low pressures allowed them to work fine. Modern rimless smokeless cartridges could have and would have and several do work just fine with very little or no taper because they headspace on the shoulder and seal the chamber.300 AAC Blackout is an example of a modern bottlenecked cartridge with a shoulder and little or no case taper despite the case being created and "homemade" cases being formed from NATO/.223 Remington brass.
Everyone is entitled to their own opinion along with varying comfort levels regarding the chemicals and materials they are willing to put in their body. We are merely sharing our opinion and encouraging our readers to be aware of their food choices. It is not surprising that this information you have sited came from a government-funded website/database. Sadly, conflict of interest is highly prevalent in our culture. It will be interesting to see what becomes of this additive. At this point we are happy to see some response from food companies who are reformulating their products to not include carrageenan.
Houseflies play an important ecological role in breaking down and recycling organic matter. Adults are mainly carnivorous ; their primary food is animal matter, carrion , and faeces , but they also consume milk, sugary substances, and rotting fruit and vegetables. Solid foods are softened with saliva before being sucked up.  They can be opportunistic blood feeders.  Houseflies have a mutualistic relationship with the bacterium Klebsiella oxytoca , which can live on the surface of housefly eggs and deter fungi which compete with the fly larvae for nutrients.