140 gr monoflex for 30-30 problems - 08/26/11
�140 gr monoflex for 30-30
Using Marlin 336c, handloading 150 gr Sierra FN, 30 gr of IMR3031, getting 2.5 inch groups at 100 yds.
Handloading 34.1 gr Leverevolution behind a 140 gr monoflex, getting 14" groups at 100 yds. Hard to keep them on the paper.
Using Lee Anniversay press with full length resize, and the factory crimp die.
Only thing I can see is that even with die and adjusting screw turned all the way in, it only seats the bullet to the bottom edge of the top cannelure, so when crimped, the case doesn't move into the cannelure. Checked when firing, and there was no bullet movement.
The other thing is the shape of the bullets. The 150 gr. has almost no taper, so when fired, it doesn't have far to go before engaging the lands. The tapered 140 gr. looks like it would have to travel much further, giving it a chance to wobble around a bit first.
Does the bullet need to be seated shallower to allow for that?
This one has me puzzled, and wondered if anyone has run into similar issues, or just has any ideas.
Using Marlin 336c, handloading 150 gr Sierra FN, 30 gr of IMR3031, getting 2.5 inch groups at 100 yds.
Handloading 34.1 gr Leverevolution behind a 140 gr monoflex, getting 14" groups at 100 yds. Hard to keep them on the paper.
Using Lee Anniversay press with full length resize, and the factory crimp die.
Only thing I can see is that even with die and adjusting screw turned all the way in, it only seats the bullet to the bottom edge of the top cannelure, so when crimped, the case doesn't move into the cannelure. Checked when firing, and there was no bullet movement.
The other thing is the shape of the bullets. The 150 gr. has almost no taper, so when fired, it doesn't have far to go before engaging the lands. The tapered 140 gr. looks like it would have to travel much further, giving it a chance to wobble around a bit first.
Does the bullet need to be seated shallower to allow for that?
This one has me puzzled, and wondered if anyone has run into similar issues, or just has any ideas.