Brutus
CGN Ultra frequent flyer
I have a BRNO Combo gun in 30-06 and 12ga and which I like. The gun is pretty light in comparison to my 12ga pumps and semi-autos. Barrels are very thin and will heat up quickly .... but this is the gun you carry all day ... and maybe only fire 1 or 3 times that day ....
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Even the Springfield CZ M6 copy in 22 Hornet/410 suffers from this, cold barrel shot is just fine out to 80-100 yards with irons. But if you wish to shoot a group in normal sighting in fashion forget about it. In mine the subsequent shots impact lower and lower as barrel gets warmer.
But in reality it's quite small animal accurate out to 70 yards. And deer accurate to 100 your first shot.
So, it's not a big issue. These aren't range toys IMO.