Just got my rifle back from Jamie Ogburn at Ogburn Combat Development. Had him chamber it in 260 AI with 40 degree shoulder throated for 147 ELDMs at 2.900 COL.
He did a great job. Thanks again!
Anyways...I wanted about 400 pieces of brass so I could have enough to be loaded for 2 matches. I didn't want to lose 1/5 to 1/4 of my barrel life by shooting factory 260
loads. I also built it so I could have the increase in velocity for the match, not shoot 2 matches at a lower performance level. I tried the cream of wheat method and it was
dirty, time consuming and required a lot of cleaning. Also, I didn't always get properly formed shoulders.
I figured I might try reduced loads. Really reduced loads. I found some lubricated lead 140gr 6.5mm gas checked bullets at Montana Bullet Works
https://www.montanabulletworks.com/product/264-rcbs-57094-140gr-fn-gc/
I ordered the linotype .265 diameter bullets. Didn't figure they would lead the bore I the velocity I was intending to shoot them at. Came in quick and were packaged nicely.
I set up my Dillon 550 with a Lyman type M die to bell out the mouth to make it easier to seat, not shave the lead bullets. I used 12 grains of Trailboss and seated the bullets
to where they had a crush fit into the riflings of about .030. Then I took out the bell in the case by using the Lee factory crimp die. Setting up the press took a little time but running all 400 of the fireforming loads went really quick.
Seating the bullets into the riflings made chambering a round a little more of a chore but it was worth it. It kept the case head pushed tighltly into the bolt face. The case had no where to go but forward. Each firing with the above load gave me a very nicely formed shoulder and about 1200 fps. I shot most of them into a pile of sand. Not looking for groups, just looking for finished brass. The pressure is really low. No leading and no measureable throat wear.
I'll try to post some pics. I have plenty of finished brass. I just need a find some more projectiles to take sure pictures of process in stages. I hope this method helps someone else. it worked really well for me.
He did a great job. Thanks again!
Anyways...I wanted about 400 pieces of brass so I could have enough to be loaded for 2 matches. I didn't want to lose 1/5 to 1/4 of my barrel life by shooting factory 260
loads. I also built it so I could have the increase in velocity for the match, not shoot 2 matches at a lower performance level. I tried the cream of wheat method and it was
dirty, time consuming and required a lot of cleaning. Also, I didn't always get properly formed shoulders.
I figured I might try reduced loads. Really reduced loads. I found some lubricated lead 140gr 6.5mm gas checked bullets at Montana Bullet Works
https://www.montanabulletworks.com/product/264-rcbs-57094-140gr-fn-gc/
I ordered the linotype .265 diameter bullets. Didn't figure they would lead the bore I the velocity I was intending to shoot them at. Came in quick and were packaged nicely.
I set up my Dillon 550 with a Lyman type M die to bell out the mouth to make it easier to seat, not shave the lead bullets. I used 12 grains of Trailboss and seated the bullets
to where they had a crush fit into the riflings of about .030. Then I took out the bell in the case by using the Lee factory crimp die. Setting up the press took a little time but running all 400 of the fireforming loads went really quick.
Seating the bullets into the riflings made chambering a round a little more of a chore but it was worth it. It kept the case head pushed tighltly into the bolt face. The case had no where to go but forward. Each firing with the above load gave me a very nicely formed shoulder and about 1200 fps. I shot most of them into a pile of sand. Not looking for groups, just looking for finished brass. The pressure is really low. No leading and no measureable throat wear.
I'll try to post some pics. I have plenty of finished brass. I just need a find some more projectiles to take sure pictures of process in stages. I hope this method helps someone else. it worked really well for me.
