Originally Posted By: MatlockTo a very rookie reloader, this seems dangerous. But then again, what do I know... I guess it's doable. Just not sure I understand the why you would continue trying to push a .227 down a .224 hole once you discovered the error.
if done improperly - it could be quite dangerous. especially if used accidently in a developed load for another projectile at or near max charges.
when you put a projectile inside the neck of a piece of brass that's larger than the standard size, even by as little as .002 - .003, that will increase the OD of the neck in your loaded cartridge. if you have a tight neck chamber, or brass that has a thick walled neck on it you could potentially have chambering issues with it (this is common in the 300 blk world, even with normal .308 bullets and there is a specific go/nogo list of brass that can be used without an initial neck turning to thin the material).
additionally if you do successfully chamber a round like that, you could potentially crimp your bullet into the neck of the brass, quite possibly way to much - causing a pressure spike and an unsafe situation there.
the other way this could be quite dangerous is if the projectile is loaded to OAL spec for another bullet, but the profile difference causes the OGIVE of the bullet to jam into the lands. Another good way to have a potential pressure spike.
This can also potentially cause chambering issues as well if that ogive is soo far out that it wont even let the round fully seat. This can happen even in the freebore area before the lands, depending on the bullet and chamber design.
as well as causing chambering issues, ogive contact with the chamber can also cause bullet setback, which again can cause pressure spike issues depending how severe it is. Move the bullet back, case volume loweres in relation to powder charge = pressure increases.
any of these situations could be dangerous, and potentially seriously damaging to your firearm or you and those around you. the closer you are to a max charge, the potentially more dangerous it could be.
in the blackout as mentioned earlier, the experimentation with .310 and .311 bullets happened during the component shortage after sandy hook when you just couldn't find stuff so we had to use whatever was available. as mentioned folks were successful both in resizing these through a lee .308 push through bullet sizing die (like would be used for cast) and for folks using them as-is. The hornady .310 "zmax" or .310 sst bullet worked wonderful when paired with proper load development and understanding of what was going on with the projectile, loaded cartridge and the chamber of the firearm they were being used in. my resized ones are some of my favorite bullets to shoot.