Para1911A1
Member
Hello All,
I just got a Browning AB3 in 270 WIN. I have shot two boxes of Winchester Super X for the break-in procedures. I started to work up a load from min to max with 5 rounds in .2 gr. steps. I began shooting these test rounds but stopped at the third step because of flat primers (see Pics). I expected the primers to eventually show signs of pressure but not at min load. The flattening seems the same on all, but a little more than the Winchester factory rounds. I am very sure of the charge weights. From a RCBS measure then trickled up on an electronic scale, then verified on a RCBS 505 balance scale. I'm not having any extraction problems. Do these look alright? any thoughts? All the facts below.
CASES: Trrimmed Federal once fired.These were FL sized because they were fired in my old rifle.
PRIMERS: Winchester Large Rifle
POWDER: VihtaVoli N560 56.2 gr - 58.0 gr. (Max = 61.3)
BULLET: Hornady 130 gr, SST
CRIMP: Lee Factory Crimp Die
I just got a Browning AB3 in 270 WIN. I have shot two boxes of Winchester Super X for the break-in procedures. I started to work up a load from min to max with 5 rounds in .2 gr. steps. I began shooting these test rounds but stopped at the third step because of flat primers (see Pics). I expected the primers to eventually show signs of pressure but not at min load. The flattening seems the same on all, but a little more than the Winchester factory rounds. I am very sure of the charge weights. From a RCBS measure then trickled up on an electronic scale, then verified on a RCBS 505 balance scale. I'm not having any extraction problems. Do these look alright? any thoughts? All the facts below.
CASES: Trrimmed Federal once fired.These were FL sized because they were fired in my old rifle.
PRIMERS: Winchester Large Rifle
POWDER: VihtaVoli N560 56.2 gr - 58.0 gr. (Max = 61.3)
BULLET: Hornady 130 gr, SST
CRIMP: Lee Factory Crimp Die