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Jump,
Does your father or you reload? Most of the off beat (or better "unique") cartridges suitable for varmint/deer are best reloaded but not all.
So lets look at some cartridges:
With absolutely no disrespect I think the 6.5 creedmore and the 260 Rem are identical in functional ballistics and on game. Both make excellent rounds. Go onto google and type in 6.5 creedmore and you will get a wealth of articles.
Next what about Ackley improved versions of the 260 and the 6.5x55 swede. awesome rounds and unique. Factory loads can be fired and usually are just as accurate
Now don't leave out the European 6.5x57, in a nice custom mauser say a full stock carbine would be great!
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OK what about a 6mm round, the old 6mm remington is one of my favorite rounds for varmint/deer. it is a little different and works great.
Just my two cents, thanks for listening Old Moss