Ian M
Well-Known Member
Finished breaking in the barrel on the new Cooper today, very pleased when I started shooting test loads. Not much time so I loaded unfired Norma brass with 47-49 gr. RL-22, Win. primer, 140 A-Maxk seated so that the base of the bullet is in line with the base of the neck (not very sophisticated, I eye-balled it and did not even bother to write down the measurement. The seating die is still set so I will make some more and do a measurement). After break-in my buddy shot a three-shot group with the last three break-in loads, 44/RL-22/140 Amax and they went into 0.276". Cleaned the barrel for a last time during what I might call breaking-in and started shooting five shot groups. Buddy shot 47, 48 and 49 gr. loads of RL-22, 47 grain was the best with four into 0.266", one shanker called out. I shot the remaining five 47gr. loads into 0.270" for four, also shanked one out but did not call it. Believe that this load will shoot good enough for what I want, might try some more loads but... not sure I should expect any better from this beautiful little rifle. Have only shot 40 rounds so far and I have a feeling this is going to be a fine long range deer rifle. Now to get some drops and kill some steel plates.