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Load Testing Which Group to Use?

 
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  #1  
Old 07-10-2012, 10:23 AM
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Location: Central, KY
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Load Testing Which Group to Use?

Shooting from the backyard load development range this morning, trying out 175 SMKs out of my 308. I want to tighten up my groups past 600 yards.

Lapua Brass
Fed Match Primers
Varget Powder
175 SMK



I loaded 3 rounds each: Tested at 100 yards:

42gr = 2479, 2509, 2529 fps group = .567"

43gr = 2517, 2605, 2586 fps group = .568"

43.5gr = 2614, 2609, 2622 fps group = 0" one hole barely could tell that 3 shots went through.

44gr = 2646, 2658, 2670 fps group = .9"

44.5gr = 2696, 2684, 2679 fps group = .822 two in one hole

45gr = 2727, 2743, 2744 fps group = .512" two in one hole

I'd like some advice on which I should choose to improve on for 600-1000 yards? I plan on selecting one and loading up more for 200 yard testing.

These are the ones I'm considering..... I like the 3 in one hole but the velocity is a liittle slow for LR shooting?? The other 2 could have been me..... or the some other anomilly.





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Old 07-10-2012, 11:08 AM
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Re: Load Testing Which Group to Use?

How far can you shoot during load development? I often take the 3 or 4 best loads at a hundred and test them at 300 to see which will do best at longer ranges. For whatever reason, the smallest groups at 100 don't always produce the smallest groups at 300. However, my smallest groups at 300 seem to continue to be the best shooters at the longer ranges.

Also, when I do the testing at 300 yards I load up 7 of each load and shoot groups of 7. It takes longer to test, but it really shows you the accuracy potential of your load. It also gives you the chance to call one or two bad shots and still see how your load is doing with a 5 or 6 shot group.
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Old 07-10-2012, 11:17 AM
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Re: Load Testing Which Group to Use?

200 yards is all I can do behind the house.... most convienent.
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Old 07-10-2012, 11:22 AM
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Re: Load Testing Which Group to Use?

In my mind 200 Yards will still give you a decent indication of which will be the best load. If I were you I'd load up 7 at 42.0 grains, 43.5, and 45.0 grains. Take your time when you shoot them and see which one shoots the best.
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Old 07-11-2012, 04:44 PM
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Re: Load Testing Which Group to Use?

I'd load up 10-20 rounds at 43.5 grains and see if the groups and velocity remain consistent at 100-200 yds.

If so, then you won't have any trouble at 600yds.

-- richard
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Old 07-11-2012, 09:08 PM
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Re: Load Testing Which Group to Use?

If it is not too inconvenient to test at 600. I would if I were you. Believe it or not I have had one hole groups at 100 that would not stay on a 8x10 at 600. I have also had tolerable but not great groups @ 100 turn into show stoppers at 700.
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Old 07-15-2012, 08:20 AM
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Re: Load Testing Which Group to Use?

That is so true.I've burn pounds of powder and hundreds of bullets looking for the perfect 100 yard group and later find that group really sucks at 200 yards.I think now when I do load development,I'll either just shoot them at 200 yards,or load five for 100 yards and load five for 200 yards and see how they group.
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