Which FL case die press designs, O-type, C-type, or turrett- type, are best for producing the best cases for most precise/tightest BR rifle POI groups?
I have a Redding T-7 turret press (the only case die press I have; I use an arbor for seating bullets) which I use with Redding Type-S competition full length case dies. I find I have to adjust to bring the bottom of the FL case die to very barely touch the top of the case holder located on top of the ram (in full upright position) in order to re-size my brass (6.5x47, or 308) so I don't get excessive shoulder bump. These lapua brass have been fired 3-4 times and, with the firing pin out, the bolt will drop (smoothly) only with slight/moderately firm pressure on the bolt (noticeably more than with new lapua brass). This means, as expected, the brass is losing some of its flexibility with repeated firing (only 3-4 times).
The purpose of the case die is, in part, to bring the shoulder back toward its original position to provide proper shoulder bump. However, because the case die is in its lowest/downward position (in bare contact with the top of the ram/case holder), it will not push back the case shoulder down further, resulting in this case shoulder bump problem (which may force me to use new brass, which is OK). This is a separate problem from the case press design problem.
When working on the above matter, I noticed on the T-7 press, when I raised the ram (with case to be resized in the ram case holder), the turret would visably (I had look very closely to see this problem) raise very slightly (the press turrett bolt is tight as it should be) because evidently I had lowered the case die a few thousanths too low. I re-adjusted the case die upward slightly, and this turrett-raising problem resolved. However, it became apparent to me that even with the turrett bolt very tight, it was possible that if the turrett raised slightly in this manner, it might result in mis-aligned sized cases that might detract from case performance.
I think that an O-type press design would not have a risk of this problem because there is no way the O-type design would allow the die to rise at all; I think the O-type design might be much stronger than the turret-type press. What are your thoughts? What is the optimal case press design for BR rifle reloading - O-type, C-type, turret type, or something else?
I am asking this because I am thinking about replacing my T-7 turret press with an O-type design press (rock chucker). I know I can have the T-7 turret bushing replaced by Redding (shaved down a few thousanths), which might (?) resolve this matter for this press but the turret would be more difficult to rotate, and I would still have this potential problem as one additional factor to consider if my groups are for any reason not tight. Should I replace the T-7?
Cassidy
I have a Redding T-7 turret press (the only case die press I have; I use an arbor for seating bullets) which I use with Redding Type-S competition full length case dies. I find I have to adjust to bring the bottom of the FL case die to very barely touch the top of the case holder located on top of the ram (in full upright position) in order to re-size my brass (6.5x47, or 308) so I don't get excessive shoulder bump. These lapua brass have been fired 3-4 times and, with the firing pin out, the bolt will drop (smoothly) only with slight/moderately firm pressure on the bolt (noticeably more than with new lapua brass). This means, as expected, the brass is losing some of its flexibility with repeated firing (only 3-4 times).
The purpose of the case die is, in part, to bring the shoulder back toward its original position to provide proper shoulder bump. However, because the case die is in its lowest/downward position (in bare contact with the top of the ram/case holder), it will not push back the case shoulder down further, resulting in this case shoulder bump problem (which may force me to use new brass, which is OK). This is a separate problem from the case press design problem.
When working on the above matter, I noticed on the T-7 press, when I raised the ram (with case to be resized in the ram case holder), the turret would visably (I had look very closely to see this problem) raise very slightly (the press turrett bolt is tight as it should be) because evidently I had lowered the case die a few thousanths too low. I re-adjusted the case die upward slightly, and this turrett-raising problem resolved. However, it became apparent to me that even with the turrett bolt very tight, it was possible that if the turrett raised slightly in this manner, it might result in mis-aligned sized cases that might detract from case performance.
I think that an O-type press design would not have a risk of this problem because there is no way the O-type design would allow the die to rise at all; I think the O-type design might be much stronger than the turret-type press. What are your thoughts? What is the optimal case press design for BR rifle reloading - O-type, C-type, turret type, or something else?
I am asking this because I am thinking about replacing my T-7 turret press with an O-type design press (rock chucker). I know I can have the T-7 turret bushing replaced by Redding (shaved down a few thousanths), which might (?) resolve this matter for this press but the turret would be more difficult to rotate, and I would still have this potential problem as one additional factor to consider if my groups are for any reason not tight. Should I replace the T-7?
Cassidy
