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Advisory Panel
Inserts are .22 cal. The early boys manual of 1937 talked about a 303 subcal, but by 1939 there was an amendment to scratch that and insert .22 .
The subcal rounds are rifled and have a small adapter to convert the center fire to rimfire. The adapter is usually missing...I have only one of the adapters.
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09-29-2007 03:53 PM
# ADS
Friends and Sponsors
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.22 LR sub cal unit.....They were discontinued as hard on the .55 bore. They found evidence of gas cutting in the barrel.
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Advisory Panel
Another Boys rifle owner told me that he had enough of these subcals to fill the mags. His kids would fire it, but he warned that the bullets would tumble down the barrel.
I just had a Kreiger match barrel installed on mine in 50 cal, so these wouldn't work anyway, and if they did fit, I wouldn't use them.
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