Heres the ammo I would use. Remington core lokt 180 grain psp. There is more exciting and expensive ammo but you wont need more than this. Also I cant give you any numbers on this but I read an article a while back on the 7mm rem mag and it stated that this cartrige will gain velocity with barrel length up to 28". So sounds like you got a screamer. Not to mention accuracy potential.
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