223 boolits in 1:9 Bull barrel and 1:12 Standard barrel Handi-rifles
Gas checked 22 Bator (50 gr.) and RCBS 22-55-SP (58 gr.) boolits were made from air cooled 49-49-2 Pb-WW-Sn alloy.
The "launch platforms" are a.) Bull barrel of 1 in 9 twist, and b.) Standard barrel of 1 in 12 twist. The powder tested is IMR4227.
1:9 Bull barrel
i.) with 22 Bator's, groups approached 2" at 100 yards
ii.) with 22-55-SP's, the results were no better
iii.) other powders to be tested include IMR700X, Unique, and SR7625
1:12 Standard barrel
i.) with 22 Bator's, not tested, yet
ii.) with 22-55-SP's, groups were 1.25" at two adjacent 0.5 grain powder nodes
iii.) powder charge will be "tightened" to 0.10 grain increments
iv.) other powders to be tested include IMR700X, Unique, and SR7625