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makes a difference what primer and what case you are using, especially with 308 brass differences. If using a heavy case would suggest droping down to 43.0 grains 748, and use a chronograph. If you are getting higher than expected velocitys, you may be getting higher presuure than desired from that chamber.
I have trouble getting accuracy with 1:10 in twist and less than 165 grain bullets in gas rifle currently used. All the other semi's with slower twist handle 125 ,150 grainers just fine.
Am gettingvery good accuracy with 748
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