Difference:
Autoprime = hand primer
Safety Prime = ram priming accessory
I looks like one of those kits comes with the Lee Autoprime XR. This is a hand primer. It comes with a special shellholder kit, just for the priming tool. You put the appropriate shellholder in it, load it up with primers, and then you stick each case in there to prime it by squeezing the handle.
The other kit comes with Small and Large Safety Prime. This attaches to the press and dispenses primers into the ram priming arm, like a little woodpecker Pez dispenser. You raise the ram. A little priming arm drops out of a slot on the right side of the press, by gravity. At the very top of your stroke, you stop and press the Safety Prime, and it places a primer in the cup. Then you lower the ram to seat.
Note that both kits should come with the ram priming arms, and you don't need a Safety Prime to prime on the ram. You can put the primer in by hand. So either choice has just an extraneous bit of optional kit. You can't really go wrong with either.
Personally, I bought the same kit, but back when it only came with the Lee Autoprime (original, not the XR). And I don't use it. I prime on the ram. But I don't think I'd use the Safety Prime, either.
Upgrades?
To this day I haven't upgraded anything, except the powder funnel. But I didn't like any of the others, either; had to make my own. I still use the press, the trimming system, powder dispenser, and scale. Have made something like 6 thousand rds on it, so far. Well, I guess I upgraded the Lee trimmer shellholder with a Lee Zip trim chuck and spindle.
3 die vs 4 die:
Personally, I have only really used the FCD on my 40SW set. That was to debulge brass, and it was very good for that.
Autoprime = hand primer
Safety Prime = ram priming accessory
I looks like one of those kits comes with the Lee Autoprime XR. This is a hand primer. It comes with a special shellholder kit, just for the priming tool. You put the appropriate shellholder in it, load it up with primers, and then you stick each case in there to prime it by squeezing the handle.
The other kit comes with Small and Large Safety Prime. This attaches to the press and dispenses primers into the ram priming arm, like a little woodpecker Pez dispenser. You raise the ram. A little priming arm drops out of a slot on the right side of the press, by gravity. At the very top of your stroke, you stop and press the Safety Prime, and it places a primer in the cup. Then you lower the ram to seat.
Note that both kits should come with the ram priming arms, and you don't need a Safety Prime to prime on the ram. You can put the primer in by hand. So either choice has just an extraneous bit of optional kit. You can't really go wrong with either.
Personally, I bought the same kit, but back when it only came with the Lee Autoprime (original, not the XR). And I don't use it. I prime on the ram. But I don't think I'd use the Safety Prime, either.
Upgrades?
To this day I haven't upgraded anything, except the powder funnel. But I didn't like any of the others, either; had to make my own. I still use the press, the trimming system, powder dispenser, and scale. Have made something like 6 thousand rds on it, so far. Well, I guess I upgraded the Lee trimmer shellholder with a Lee Zip trim chuck and spindle.
3 die vs 4 die:
Personally, I have only really used the FCD on my 40SW set. That was to debulge brass, and it was very good for that.
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