Yeah there are lots of variables,
My .35 Whelen for example I bought brand new and tried load after load and at the 26th load I decided I should have the trigger set down from its' factory setting.When I got it back and before I shot it I deciede I would crimp my bullets and seat them a little deeper and the next two loads out of it were under an inch @100yds.Now the only thing is I don't know what actually fixed it but it shoots like a dream now.So I have a sheet with 28 different loads of different bullets and powders.I would bet trigger pull and crimping were the ones.I think the factory setting was 5-6lbs and i had it set down to 3.5lbs.Check your factory loads,sometimes if the bullets have a cannilure on them they will be crimped at the factory.They say crimping them makes the pressure more consistant.If they are crimped then look elswhere ie:trigger,bullet weights.I know of a few 7mms that really like 150 gr bullets.
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