The Wiry Irishman
Member
I'm about to start working up a target load for bullseye competition for my 1911. I'm using 200gr. Lasercast SWCs, and will be using Bullseye powder.
I just got my press set up for correct OAL, and opened up my Lyman's 49th to start dialing in my powder measure, and I've run into some confusion. They have two 200gr SWC bullet types. The first is a flat base with two lube grooves. They list the OAL as 1.161" and a suggested starting load of 3.5gr Bullseye. The second is a bevel base with one lube groove (the Lasercast bullets are of this type) with an OAL of 1.235" and a suggested starting load of 4.9gr Bullseye. The discrepancy in starting loads is what I'm confused about. The list the velocity at starting load for the bevel base bullet as 840 fps, way above what I've heard most people shoot bullseye with. I've shot a friend's target loads through their gun with very excellent results, his load is 4 gr Bullseye, 1.25" OAL, and the exact same bullets I'm using. That's .9gr under the suggested starting load AND a longer OAL. The 645fps velocity listed with the 3.5gr starting load for the flat base bullet seems more in line with typical target velocities, and I'd love to start there. The question is, how low can I safely go with my bullets? Am I likely to run into pressure spike problems if I start from the lower flat base load data?
I just got my press set up for correct OAL, and opened up my Lyman's 49th to start dialing in my powder measure, and I've run into some confusion. They have two 200gr SWC bullet types. The first is a flat base with two lube grooves. They list the OAL as 1.161" and a suggested starting load of 3.5gr Bullseye. The second is a bevel base with one lube groove (the Lasercast bullets are of this type) with an OAL of 1.235" and a suggested starting load of 4.9gr Bullseye. The discrepancy in starting loads is what I'm confused about. The list the velocity at starting load for the bevel base bullet as 840 fps, way above what I've heard most people shoot bullseye with. I've shot a friend's target loads through their gun with very excellent results, his load is 4 gr Bullseye, 1.25" OAL, and the exact same bullets I'm using. That's .9gr under the suggested starting load AND a longer OAL. The 645fps velocity listed with the 3.5gr starting load for the flat base bullet seems more in line with typical target velocities, and I'd love to start there. The question is, how low can I safely go with my bullets? Am I likely to run into pressure spike problems if I start from the lower flat base load data?