If I set up a bright red 12ga shotgun hull on the 25 yd berm, you'll aim at the hull.
I honestly have done this fun test with several people, and the best part is, most will come as close to the shotgun hull as they do to the center of the plate. Not necessarily 'every' shot, but most shots will. What will surprise some, is that they may 'bounce' the hull at least once.
Yes, done it often with shotgun hulls/golf balls. This is true of shorter distance target as well, as what you are doing is "walking" your shots based on your last POA/POI. But this is not accuracy verification of test load development that requires the exact same POA for each shot fired.
What I got as the intent of the OP was test load development and consistency verification of expected shot group sizes.
TH3180 said:
I shot some AA#7 pushing a 147g last week and I got a 1.841" group. I shot the same load today and my group was 2.339". I'm working up these loads
When I work up my loads, I try to shoot them all on the same range trip, from starting charge to high/max loads to duplicate the same temperature, pistol/barrel condition and shooter's condition (me and approximate amount of coffee in the system
) for more consistent shot group comparison. I select the same POA for every shot fired for the same shot group.
When I review my shot groups of each charge shot at various distances, I usually get accuracy verification with the 7 yard groups. Comparing 10 yard and 15 yard shot groups usually reveal where the more accurate charges were. If you look at the range test of 180 gr test loads below, although 4.1 gr charge did produce a smaller 1" shot group at 10 yards and 4.4 gr charge produced a larger 2" shot group, ultimately 15 yard shot groups determined that 4.4 gr charge was the most accurate charge load for that range test.
180 Lead/3.8 gr - 7 yard 2" - 10 yard 3" - 15 yard 4" - Mild recoil
180 Lead/4.1 gr - 7 yard 1.5" - 10 yard 1" - 15 yard 4" - Moderate recoil
180 Lead/4.4 gr - 7 yard 1" - 10 yard 2" - 15 yard 2.5" - Firm recoil
Some may say, but you got a smaller shot group of 1" at 10 yards with the 4.1 gr load. I would say, you are right. So, I would repeat my range test using 4.1 and 4.4 gr at the same 10 yard distance on the follow up range test to verify whether this was the charge load or the shooter.
I usually repeat my range tests until I get duplicate results at least twice before I consider my findings consistent and repeatable. I also usually bring a known reference load that's been verified to be accurate for comparison as well.
When I tested my initial 200 gr 45ACP 4.0 gr charge test load of Promo and got inconsistent shot groups, I went back to the range with my reference 200 gr 45ACP 5.0 gr W231/HP38 loads and the reference loads produced expected accurate shot groups. This made me realize that my inconsistent shot groups were due to the load and not the pistol.
I hope this helped.