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like most mis guns,the amp size is related to the materials your welding.
so go to the basic question. what am i welding?.
what thinkness is it?
what wire size am i useing?
at high amps or volts ,your gun maybe required to be water cooled?
then you will zero in on maybe a bernard 300/400?
the guns are very good ,and i have use them menny years.
word of causion: do not twist or kink a mig gun cable. the wire may get stuck,even for a second. this will cause the wire to come off on you drive rolls and you will think that the problem is something else. so be carefull.
one thing else. antie-splatter. spray some on you wire. this will not in any way hurt your gun and will alow smoth travel by the wire, in side your cable,get rid of dirt that naturally is picked up during your welding. .