Wasn't going to do it this close to the hunting season but got restless.
Had a okay load with H1000 and Berger 230 gr target hybrid. Used 88.5 gr for vel of 2860 fps. Load is close to max.
The barrel was a 24" rem takeoff in 300 win mag. I machined it to fit a push feed model 70 and used a PTG reamer.
Used the same components with same seating depth just substituted RL-33. Started with 90 gr and worked up. Temperatures were 85-90 degrees. Here are the results so far:
90gr 2665
92gr 2745
94gr no reading cardboard shades moved had to wait for next ceasefire to adjust
96gr 2875
98 gr 2925
100gr 3001
No signs of pressure, no bolt lift issues, primers look good etc. Will start when range opens and temps are in the low 50s. Will chrono the 100 gr load again for comparison.
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I went out again today to continue the 300 RUM testing with RL-33 and the 230 Berger target hybrid:
Shot the 100 gr load this morning in 60-70 degree weather. The average velocity for four shots was 2975 fps. This compares pretty close to yesterday's two shots averaging 3001 at 85-90 degrees. Will need more rounds to conclude if the powder is temp sensitive as well as cooler mornings. Az just won't cooperate with cooler weather yet.
Continued with more powder:
101 grs 2983 fps This is the first increase that didn't show a 50-70 fps increase in velocity. It would appear that there is nothing more to gain by increasing charges
102 grs 3016 had a tiny amount of bolt lift resistance.
Didn't try any hotter loads.
For my rifle 100 gr is the max I'll shoot. It was the most accurate too.
