- Mar 6, 2017
The easiest test is make three groups of 5 with your 154 grn. cases ( 15 rounds ) and with the exact same load make three groups of 5 (15 Rounds ) with your 157 grn. cases,. If you have have an accurate riffle, say 1 MOA , you will see two different groups begin to form on the paper at 100 yards . They may as much as an inch and a quarter apart at 100 yards , so double that at 200 yards. Both groups may be precise, depending on you and your rifle , and one is not "Better " than the other, they just shoot to different place. When I go the range , I always have a Sighter Target marked, to shoot the first three or four rounds, do the slight re adjustment with the scope , then settle in and shoot the record targets . This test will tell you all you need to know about case weight. To some shooters just looking for a 3 inch group at 100 yards, it wont matter , but to the shooter really looking for the One ragged hole group, it will. This is a three shot group (.137 ) fired from my 308 , then adjust scope up and right and 4 shot into the moth ball. I cant do that without carefully made rounds.