[Shootest]

The reason that the small primers are being used more in the 45ACP is because of the trend toward the new Non Toxic primer mixture. This mixture is more powerful and it takes less of it to equal the force of the old large primer. Also the same reason for larger flash holes and crimping the primers in place, thus pressure won’t build up in the primer pocket and the primer will not back out. Sometime in the future all will be made with small primers.