Load Development

CaptRob

Sergeant
Full Member
Minuteman
Nov 3, 2010
303
0
50
Mississippi
I am in the process of load development for my 300wm. I shot 9 five shot groupings of dif powder weights. My question is if you have 4 of the five shots in 1 hole and then 1 flyer, do you count the flyer or just look at the 4.
 
Re: Load Development

Depends on the workup method you are using. Dan Newberry's OCW uses 3 rnd groups fired round-robin. For seating depth tests I like 5 rnd groups. Shooting round-robin takes a lot of the variability out of the mix, fouling, barrel temp, wind, and such.

OFG
 
Re: Load Development

I'm with Temp9 as well--I do 3 round OCW and pick my node range, which is typically about a 0.5gr range around what shot well. From there on I fine tune with 5 shot groups
 
Re: Load Development

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CaptRob</div><div class="ubbcode-body">I am in the process of load development for my 300wm. I shot 9 five shot groupings of dif powder weights. My question is if you have 4 of the five shots in 1 hole and then 1 flyer, do you count the flyer or just look at the 4.</div></div>

If you have 4 in one hole who gives a darn about a flyer. I'd say you found your load. Probably shooter error anyways
 
Re: Load Development

This really depends on what you're doing with the load. For my long range and mid range loads, I need 20 round groups, because that's usually what we shoot in competition. If you're hunting, three rounds should do it, but I'd want to repeat it several times just to have some statistical validity. It's the large round count groups that really tell a story, and that can be obscured with small groups.

As an example, with rimfire match ammo, it's often graded by group size. Testing will consist of five ten-shot groups, and a fifty-round composite of those same groups (electronic targets make this easy). While the five ten-round groups may individually measure completely on par with a much higher grade of ammo, the fifty-round group will always be the real deciding factor. Neat stuff to watch, and really puts it all in perspective. Also gives you an insight into the inherent shortcomings of small round-count group sizes.
 
Re: Load Development

I agree, which is why aggregates win the hardware.

But, I also understand the value of three round groups during preliminary load workup.

I can't discount fliers, in testing or the possibility of showing up in matches. They count, in my book, no Mulligans. BB
 
Re: Load Development

I agree with Kevin, test the way you shoot. Firing cadence, string duration, and barrel heating need to be part of the devlopment process. Finally, I'd repeat the testing with promising loads, to reduce the role of chance before locking down a load recipe. That way, you get more of what you're expecting.

Greg