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Small rifle and small pistol are the same size. The rifle version can be used for pistol with load adjustments but you may not have enough firing pin impact to light them reliably. Small pistol primers should not be used for rifle because piercing and firing pin / bolt face erosion are likely.
Large rifle primers are taller than large pistol primers and the two should never be used as substitutes for the other.
Magnum primers in either flavor generate more flame in order to light magnum powders. They may or may not have harder cups than their standard brethren. If using magnum primers where the load data doesn't call for them you should reduce your load and work back up.
Hello I'm going to start reloading .45acp soon what primers are used for that Cal small or large pistol primers
Mostly large pistol primers. Some newer .45 cases take small pistol primers. Speer RHT "green ammo" is the main culprit here. Speer does not make non-toxic large primers so they make different cases for the green stuff. I hear rumors of Federal non-toxic ammo made the same way. Speer and Federal are owned by the same outfit, so that would make sense.
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Mostly large pistol primers. Some newer .45 cases take small pistol primers. Speer RHT "green ammo" is the main culprit here. Speer does not make non-toxic large primers so they make different cases for the green stuff. I hear rumors of Federal non-toxic ammo made the same way. Speer and Federal are owned by the same outfit, so that would make sense.
Ty you very much for the info will have to look more into that