Load Workup

[LiveLife]

If you can, try shooting 10 round groups instead of 5.

After Bart B/jmorris suggested it, I now find 10 round groups provide more information than 5.

 

[SC_Dave]

If you can, try shooting 10 round groups instead of 5.

After Bart B/jmorris suggested it, I now find 10 round groups provide more information than 5.

Agree after their suggestion. Thanks for your help.

 

[Walkalong]

I'm a moron.

No you're not, and besides, it isn't going to make a big difference. I just eyebal the charge and determine if it is 90%, 100%, slightly compressed, etc. I am not worried if I am exactly right.

 

[SC_Dave]

Follow up range trip.

10 rounds each
115 RMR FMJ RN
W231
Powder charge left to right. 4.6, 4.7 and 4.8
Shot from a rest @15 yds
1.125 COL
Glock 19.3
KKM barrel
6" targets

Called low right on 2. Called high center on 3.

While 4.6 was not bad at 1.125 COL, 4.8 was really good I thought.

4.8 cycled the pistol similarly to AE.

 

[Walkalong]

4.7 put a number of rounds in the same spot that 4.8 made a nice group at.

Re-shoot 4.7 and 4.8 and see what they do. Shoot two or three groups each.

 

[SC_Dave]

4.7 put a number of rounds in the same spot that 4.8 made a nice group at.

Re-shoot 4.7 and 4.8 and see what they do. Shoot two or three groups each.

I noticed that as well. I'll repeat as you suggested.

 

[SC_Dave]

Latest Update:

10 rounds each
115 RMR FMJ RN
W231
Shot from a rest @15 yds
1.125 COL
Glock 19.3
KKM barrel
6" targets


Shot left to right all 4.7grns


Shot left to right 4.8 grns. Throw number 2 out. The front fork on my rest was coming loose and it was flopping around for the last few shots and I didn't catch it.
David

 

[LiveLife]

Thanks for the range report update.

Looks like holes on target speak volumes. I would say 4.8 gr produced smaller groups than 4.7 gr.

 

[Toprudder]

If you can, try shooting 10 round groups instead of 5.

After Bart B/jmorris suggested it, I now find 10 round groups provide more information than 5.

True, more rounds are better for statistical information. But when I am working with expensive bullets, I tend to start my workups with 3 rounds each charge. I am looking primarily for velocity and gun function. If I don't get a good extreme spread with 3 rounds, it certainly isn't going to improve with 10. And if the gun doesn't cycle with the first shot of three, then I may even save the other two so I can pull them.

But then I am known for being a titewad.

 

[SC_Dave]

Thanks for the range report update.

Looks like holes on target speak volumes. I would say 4.8 gr produced smaller groups than 4.7 gr.

I agree.

 

[LiveLife]

I tend to start my workups with 3 rounds each charge. I am looking primarily for velocity and gun function.

Actually I do similar until I have reliable slide cycling.

What I mostly post on THR is "fine tuning" of my powder work up as initial work up for reliable slide cycling is kinda boring.

I think what members are primarily looking for is final fine tuning of powder work up to identify most accurate loads.

 

[Toprudder]

Actually I do similar until I have reliable slide cycling.

What I mostly post on THR is "fine tuning" of my powder work up as initial work up for reliable slide cycling is kinda boring.

I think what members are primarily looking for is final fine tuning of powder work up to identify most accurate loads.

Absolutely. I should have added that after I find a promising load, I go back and load up 10 or more rounds to get a better idea how it will work.

 

[Walkalong]

I like it, three groups each, much better info that way. I bet 4.9 is similar, maybe like 4.8, maybe like 4.7, but I would think more like 4.8. Then if 5.0 looks like 4.7 (Assuming it's not over max) you know you are in a sweet spot with a little leeway for powder measure charge weight variance.