500yd group with my 308

Glock-a-maniac

Glock-a-maniac

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I thought this was decent shooting so I had to share.
ATRS custom gun.
Nesika Action
Rock Creek 5R barrel
McMillan A5 stock
jewel trigger
NF 5.5-22x56 NPR-1 scope
46.7gr Varget
175gr SMK
Original Lapua brass
AI mag fed

Laying prone with Versa Bipod and rear bad

I wanted to post results from my load development on my LRT-3 50 but I've gotta work on that some more. It's an accurate gun but I need to work out some variables with the 650gr ball before I switch to a Match type bullet. I'm confident I can max out the gun potiential while mag feeding it.
 
3 shot groups don’t mean all that much - although I’m sure you rifle is a fine one capable of similar in a 5 shot group. Don’t kid yourself by this, as I’ve seen factory Remington 700 SPS Tactical’s with NO mods shoot better groups than this, with military surplus ammo.

Shoot many 5 shot groups and see what comes up ;)

Good luck (and I personally love the 175 SMK)!
 
pazzo said:
3 shot groups don’t mean all that much - although I’m sure you rifle is a fine one capable of similar in a 5 shot group. Don’t kid yourself by this, as I’ve seen factory Remington 700 SPS Tactical’s with NO mods shoot better groups than this, with military surplus ammo.

Shoot many 5 shot groups and see what comes up ;)

Good luck (and I personally love the 175 SMK)!
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way to s**t all over the guy, it's really good shooting
 
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what is the difference between 3 and 5 shot groups? In statistics three events form a trend, so do 3 shots not mean a group??

If the intent is to hit what you are shooting at, being able to make a 1.5" group at 500yds seems bloody impressive to me.

Why is it thought that 5 shot groups are more indicative of how well a rifle performs? Are you trying to determine the effect on the group from the barrel heating up, or is there something that I am missing?

not trying to be inflammatory, just trying to understand.

Cheers,
Sean
 
Great shooting! If that's a solid indicator of the capabilities of the rifle and load, you'll never have to apologize for your equipment for sure!

Cheers
Trev
 
Penrx said:
what is the difference between 3 and 5 shot groups? In statistics three events form a trend, so do 3 shots not mean a group??

If the intent is to hit what you are shooting at, being able to make a 1.5" group at 500yds seems bloody impressive to me.

Why is it thought that 5 shot groups are more indicative of how well a rifle performs? Are you trying to determine the effect on the group from the barrel heating up, or is there something that I am missing?

not trying to be inflammatory, just trying to understand.

Cheers,
Sean
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I agree! As Mark Twain said, there are three forms of lies, "lies, damn lies and statistics"!

Over the years, the three shot and five shot group crowds have been debating the relative merits but neither is based on "science". For a hunter, accuracy is more important than precision, anyway. For the bench rest crowd, the reverse is true so what one wants out of groups depends on his objectives. Statistically speaking, a three shot group is marginally less reliable than a five shot group but here one should consider the rate of fire as well. If one is solely trying to determine the "precision" of ammo and rifle combination for that day (not to take the operator factor into consideration as well), then a ten shot group allowing cooling tie between shots is a more reliable test, statistically speaking.

In any case, the OP's grouping at 500 yds is very good and it can be further improved a bit with more load development but a heck of a good start on a new rifle!
 
There is a bunch more that can go wrong mechanically over a longer string period than a very short string. This is increasingly true with more moving parts. With my semis, I don't consider anything short of several 10 shot groups. After that, I know POA vs POI, and rifle/shooter performance under those conditions. On my bolt guns, I use a single 10 shot as that is what the clip holds.

For me, accuracy is as important as precision. I have seen some rifles that shoot decent precision, but the intergroup accuracy was really bad. Small round count groups would not have caught this.

Generally, I spend my time shooting positionally, not off a bench though.

Several sites won't even accept pictures of low round count groups.

Unless you are trying to measure performance when the rifle is hot, barrel heat isn't an issue.
 
Penrx said:
what is the difference between 3 and 5 shot groups? In statistics three events form a trend, so do 3 shots not mean a group??
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The biggest difference in a 3 and a 5 shot group is not actually the equipment , if in fact the gear is up to it, which this set up likely is, but in the human variable.

Many shooters can sustain the concentration needed for a good three shot group, but cannot to it for 5 or 10 rounds at the same distance, at the same time adjusting for wind, mirage, etc., as well as having to concentrate on the shot sequence.
One may argue that the rifle may walk bullets or throw them as it is heated up, but often it is not the rifle but the shooter that is the cause of this.
Cat
 
I've found that shooting for tight groups is tough. I'll do some timed shooting with 5 shot groups but it will be a whole other experiment unto itself. I want to test the internal barrel temps as well as bore scope it to see if anything is accumulating from one shot to the next.

I had posted a 5 shot group at 100yds a while back that measured .482 outside to outside. The thing I found interesting about shooting at 100 or 200yds is how accurate you're able to shoot because of the detail still visible on the paper.
 
Welcome to the fraternity!! Nice shooting by the way. I'm about to stretch my 308 out to a mile soon. I have my fingers crossed.
The negative ones are just jealous with envy. Haha
 
Take a typical 5 shot group and see how many possible ways you can make it look better by ignoreing 2 holes.

Or

Take a couple or three 3 shot groups, stack the targets and measure across the widest holes. Hold the stack up to the light and see how many of those nice three shoters exist inside the total spread.
 
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