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Finally got the M71 out to the range. Here's how the powders rated with the 200 gr Hornady:
1) Reloader 19 - 9 shots in 1-1/2" with one more at 2"
2) H4831 - 2 five shot groups at about 2"
3) WW760 - 2 to 2-1/4" groups
4) IMR4350 - 3 to 3-1/2" groups
5) IMR4831 - 4"
6) IMR3031 - 4-1/2"
The R19 was expected to do well, but I couldn't believe the accuracy. First four shots were under an inch! I used 64 grains, and will try 64.5 next. AW, you have to try this powder with your .348. The WW760 was probably to fast to be best, as evidenced by the fact that the slowest two powders turned in the best groups. Will check the top 3 loads with a chrono when I get a chance. All information to date leads me to expect 2450 fps from R19 and the carbine barrel.
1) Reloader 19 - 9 shots in 1-1/2" with one more at 2"
2) H4831 - 2 five shot groups at about 2"
3) WW760 - 2 to 2-1/4" groups
4) IMR4350 - 3 to 3-1/2" groups
5) IMR4831 - 4"
6) IMR3031 - 4-1/2"
The R19 was expected to do well, but I couldn't believe the accuracy. First four shots were under an inch! I used 64 grains, and will try 64.5 next. AW, you have to try this powder with your .348. The WW760 was probably to fast to be best, as evidenced by the fact that the slowest two powders turned in the best groups. Will check the top 3 loads with a chrono when I get a chance. All information to date leads me to expect 2450 fps from R19 and the carbine barrel.