I just started using my new Lyman 311299 mold and am having some accuracy issues. Hopefully I can provide enough data to the forum so you can suggest what I may do to fix the problem. Are my boolits too small for this chamber as I suspect, or is something else going on?
I'm shooting .30-06 in my W70. The loads are over 16 grs of 2400 (I finally found some..) , OAL 3.245", which feels like it is just off the lands. With a 10 power scope I'm getting ~5 in. 10 shot groups at 50 yds.
I also loaded 10 rds over 32 grs of RE-15 to see if it did any better. The 10 shot group shrunk to 3-4", but I don't have much RE-15 left and don't plan on using it for this.
Shooting the same rounds, 16gr of 2400, in my M1903 with a receiver sight, I'm getting about 3 in. groups at 50 yds, which is about what I'd expect. My eyes are terrible, that's why I usually use a scope... Unfortunately, I don't have another .30-06 with a scope mounted to compare to the W70.
The details:
- My alloy is 50/50 COWW/Lino
- Lyman 311299 2 cav mold (200gr)
- I made the GCs with a Patmarlins Checkmaker using Amerimax .014 aluminum flashing.
- Lubed with my own stiff but gooey concoction of beeswax, carnauba, LLA, ATF, and synthetic 2-stroke.
- Sized with Lee .311 push through die.
I grabbed 2 finished boolits at random, took 10 measurements each
Boolit #1 min of 10: .3099
Boolit #1 max of 10: .3113
Boolit #1 avg of 10: .31053
Boolit #2 min of 10: .30915
Boolit #2 max of 10: .3114
Boolit #2 avg of 10: .31061
I did a pound cast of the W70 chamber and measured it 10 times.
PC min of 10: .30845
PC max of 10: .30955
PC avg of 10: .30905
Any suggestions would be appreciated, thanks.