These are the only lrp's I've been able to find and begs a question from some members with a bit more knowledge when it comes to these. All I've use are cci primers and never used any 34 or 41 before. 90% of any long guns I have are AR based guns, so 34's should be useful. I know the cups are harder, so it helps against slam fires. Having 243win, 260rem, 6.5creed and 308win with lrp pockets and most likely be used for 308? Would these primers be a good substitute in 45-70 (lever gun) and bolt guns alike? I'm guessing that if the hammer spring has enough force it should make it fire and/or bolt guns also? On another note has anyone used federal's AR primers?