Re: 2 rounds close then the 3rd 1 1/2 away
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BULLITT1668</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: wnroscoe</div><div class="ubbcode-body">The rifle is trying to double group. The Amax’s need to be touching or in the lands. The SMK's about .005" off. 5 shots won’t change a thing, save your components.
When I start to develop a load in a rifle I pick a starting load with my powder, primer, bullet and seating depth. Run a ladder in .5 increments until the rifle shoots or I get a slightly sticky bolt lift. If the sticky bolt lift occurs before the rifle starts to shoot like I want, I stop. The load will be at high pressure at that point and there's no sense in going higher. Pick another powder and do it again. RL-22 seems to be a good powder in 300WM but I've had good results with I7828 as well.
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What do you mean by 'double group'? I go the same problem, how do you stop it?
BTW, I'm assuming you do 3-shot groups. Right? Do you clean your barrel in between? </div></div>
With environmental conditions and shooter being ruled out of the equation, double groups are those that put two in a hole or two touching and the third, forth etc out. This is an indication that the load or seating depth needs to be adjusted or both. It's possible to have two groups inside of one group. In an ideal world your groups will print as a triangle or a circle. If they're not doing that they're out of tune. This is why I use the 3 shot method when working up loads. If two are in a hole and the third is out I usually increase the powder charge until the rifle either shoots or I get pressure. Once I get a triangular shaped group I’ll adjust seating depth to fine tune the load. Granted, this is a method I use when tuning my BR rifles but, it works on all rifles so why not.