Swiss classic green rifle????

Guerrilla

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How can I tell what rate of twist my rifle has???
I think they come in either a 1/7 or a 1/10 in both twist rates what is the heaviest bullet I can shoot
 
1 in 7 90 gr.

1 in 10 63 gr optimum

How to tell which rate of twist you have...pull a cleaning rod thruogh the bore mark top dead centre and then measure when you have come to top dead centre again, measure 10 inch or 7 inch.
 
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