So I've been shooting 250gr TTSX in my .375 h&h exclusively for about a year now. Sunday night my groups opened up to about 2 MOA or so. I cleaned the gun tonight with some copper remover and it was definitely way dirty. Is there any other way to tell it's building up?
I am shooting a 6x scope but this load used to shoot around 1 MOA consistently.
Thanks in advance.
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