Gilly78
Member
I am fairly new to reloading to start with. As far as diagnosing and powder characteristics I am still learning from more experienced. Disclaimer out of the way.
I picked up some new bullets pretty cheap and wanted to work up a load for my 7mm Rem Mag Savage 111. Components are:
150Gr-Remington Accu Tip heads
New Winchester brass
CCI LR mag primers
RL-22 powder
OAL 3.290
Previously I worked up loads for 140gr Nosler BT and 140 Gr. Corelokts and found a good load with both giving me well under MOA at 100 yards and powder at 69gr of RL-22 with the Corelokts and 68.5 with the BT's.
I went through the same steps to work up with the new bullets. Per Lyman the Max load for 150's is 67gr of RL-22. First load was 64.5, then 65, then 65.5 then 66. I had poor accuracy and no pressure signs with the lightest 3 loads then shot a 66g and blew out a primer. *** no warning what so ever. Next I droped down and shot a 65.5 which had no issues over 4 rounds previously and blown primer and would not eject. Scratching my head I shot my last 64.5 and blown primer! I then noticed the Ejector pin was stick back a good 2mm or so. My last shot of the day was with a known round of safe function I worked up a couple months ago, the 69gr behind the 140 Coreloct hunting load. BLOWN primer. All rounds were made with brand new Winchester brass at or just below 2.50 case length and double checked for OAL to be at exactly 3.290 OAL. There was no resistance in chambering so I can only assume that the chamber is over the 3.290 SAMMI length.
1)Outside temps when first loads were worked up was ~50deg. Temp yesterday was ~80-85deg. Is there that much of an impact to ambient temps to cause pressure to jump that much?
2) I am still under suggested max loads which I believe are published safe max loads. Could my chamber be off that much to not be safe to shoot published loads under max?
3) If the ejector stuck due to failure not associated with over pressure, could that cause the blown primers, or is that not a possibility and the over pressure absolutely the cause of the stuck pin and blown primers.
4) Is there anything you can see from what I have been describing that I am doing incorrect to cause human failure or anything the more knowledgeable group here could suggest as a better way to work up loads?
I picked up some new bullets pretty cheap and wanted to work up a load for my 7mm Rem Mag Savage 111. Components are:
150Gr-Remington Accu Tip heads
New Winchester brass
CCI LR mag primers
RL-22 powder
OAL 3.290
Previously I worked up loads for 140gr Nosler BT and 140 Gr. Corelokts and found a good load with both giving me well under MOA at 100 yards and powder at 69gr of RL-22 with the Corelokts and 68.5 with the BT's.
I went through the same steps to work up with the new bullets. Per Lyman the Max load for 150's is 67gr of RL-22. First load was 64.5, then 65, then 65.5 then 66. I had poor accuracy and no pressure signs with the lightest 3 loads then shot a 66g and blew out a primer. *** no warning what so ever. Next I droped down and shot a 65.5 which had no issues over 4 rounds previously and blown primer and would not eject. Scratching my head I shot my last 64.5 and blown primer! I then noticed the Ejector pin was stick back a good 2mm or so. My last shot of the day was with a known round of safe function I worked up a couple months ago, the 69gr behind the 140 Coreloct hunting load. BLOWN primer. All rounds were made with brand new Winchester brass at or just below 2.50 case length and double checked for OAL to be at exactly 3.290 OAL. There was no resistance in chambering so I can only assume that the chamber is over the 3.290 SAMMI length.
1)Outside temps when first loads were worked up was ~50deg. Temp yesterday was ~80-85deg. Is there that much of an impact to ambient temps to cause pressure to jump that much?
2) I am still under suggested max loads which I believe are published safe max loads. Could my chamber be off that much to not be safe to shoot published loads under max?
3) If the ejector stuck due to failure not associated with over pressure, could that cause the blown primers, or is that not a possibility and the over pressure absolutely the cause of the stuck pin and blown primers.
4) Is there anything you can see from what I have been describing that I am doing incorrect to cause human failure or anything the more knowledgeable group here could suggest as a better way to work up loads?
