Pharmseller
WKR
Rifles are made to SAAMI and CIP approved specifications. Factory ammunition is made to SAAMI and CIP approved specifications. Rifles are made to work with factory ammo. Magazines are designed to work with factory ammo and have minimal issues loading/feeding factory ammo.
If you want to use custom ammunition built outside of SAAMI/CIP specifications, you will need to do custom work to get these things to work in a factory rifle. If a little magazine work is all you need to do, consider it the price you pay.
Using the 88 eldm over using the 77tmk in a 223 is the same as using a 230 over a 200 in a 308. It really is a huge jump in weight and length (~15%) which most factory rifles are not set up for even if they have the right twist barrel. Whether or not the cartridge has enough horsepower to effectively launch the larger bullet is an entirely different discussion.
Jay
Good point.
88 grains is a lot to ask out of a 20” .223.
P