6.5 CM load help/advice

[C-grunt]

Im loading ammo for my 6.5 CM with a 22 inch Gradous barrel.

Loads tested were 41.5 grain and 42 grains of H4350
Each load was a Hornady once fired case (through my rifle), a 140 ELD-M, Federal Champoin large rifle primers, Full length resizing, and loaded to 2.8 COAL. All done with a Lee hand loader

The 41.5 grain load shot better accuracy but it had a SD of 19.

2020-01-13_03-25-21 by chase ditwiler, on Flickr

I yanked one on this group but it still shot a decent group

2020-01-13_03-31-10 by chase ditwiler, on Flickr


The 42 grain load shot lower SD of 12 but would overall shoot a little less accurately and would throw a flyer every so often.

2020-01-13_04-35-42 by chase ditwiler, on Flickr

2020-01-13_04-36-00 by chase ditwiler, on Flickr

This 42 grain group shot better but I had a primer that wouldn't ignite so it's only a four shot group (last of my loaded rounds)

2020-01-13_03-24-38 by chase ditwiler, on Flickr





Now I fully acknowledge that the flyers could have been me but those shots felt good and I was shooting off a concrete bench using bags. All the ammo was loaded at the same time and Im not sure why the flyers would be so far off. Im still fairly new at reloading so what should I be looking for to either improve the SD on the lighter load or get rid of the flyers on the hotter load?

 

[Steel head]

What chrony?

shoot the 41.5 at distance and see if vertical Is a problem or not.

 

[C-grunt]

What chrony?

shoot the 41.5 at distance and see if vertical Is a problem or not.

Magnetospeed Sporter.

I'll be shooting from 500 to a mile over the weekend.

I know shooting my factory Hornady 140 ELD-M with the SD of 30+ the vertical starts to become a big issue past 1000.

 

[Hondo64d]

Im loading ammo for my 6.5 CM with a 22 inch Gradous barrel.

Loads tested were 41.5 grain and 42 grains of H4350
Each load was a Hornady once fired case (through my rifle), a 140 ELD-M, Federal Champoin large rifle primers, Full length resizing, and loaded to 2.8 COAL. All done with a Lee hand loader

The 41.5 grain load shot better accuracy but it had a SD of 19.

2020-01-13_03-25-21 by chase ditwiler, on Flickr

I yanked one on this group but it still shot a decent group

2020-01-13_03-31-10 by chase ditwiler, on Flickr


The 42 grain load shot lower SD of 12 but would overall shoot a little less accurately and would throw a flyer every so often.

2020-01-13_04-35-42 by chase ditwiler, on Flickr

2020-01-13_04-36-00 by chase ditwiler, on Flickr

This 42 grain group shot better but I had a primer that wouldn't ignite so it's only a four shot group (last of my loaded rounds)

2020-01-13_03-24-38 by chase ditwiler, on Flickr





Now I fully acknowledge that the flyers could have been me but those shots felt good and I was shooting off a concrete bench using bags. All the ammo was loaded at the same time and Im not sure why the flyers would be so far off. Im still fairly new at reloading so what should I be looking for to either improve the SD on the lighter load or get rid of the flyers on the hotter load?

ES and SD data from five round groups are statistically insignificant. In the end, only what happens on the target matters. I’d put both loads on paper at 500 and see what that tells you.

John

 

[ditter]

Agree with above. A few round groups wont give you much info.

Why not do a full load development? I just did one for a 6.5 CM with a new barrel. Went from 39.0 to 43.0 in .3 increments for 3 shots each. The low SD charge weights were pretty obvious. Find what your rifle likes and then experiment a little more with fine tuning OCW and seating depths. You can sneak down into the single digits SDs pretty quick.
I also think you could chop down the SDs by using Lapua brass instead of Hornady. You dont even have to buy virgin brass. Buy a box of Berger ammo and keep the brass.

 

[redbullitt]

Definitely shoot the groups at distance if possible and watch the vertical spread. Assuming you're on your game of course, it should be very easy to see!

 

[Robert Gradous]

Im loading ammo for my 6.5 CM with a 22 inch Gradous barrel.

Loads tested were 41.5 grain and 42 grains of H4350
Each load was a Hornady once fired case (through my rifle), a 140 ELD-M, Federal Champoin large rifle primers, Full length resizing, and loaded to 2.8 COAL. All done with a Lee hand loader

The 41.5 grain load shot better accuracy but it had a SD of 19.

2020-01-13_03-25-21 by chase ditwiler, on Flickr

I yanked one on this group but it still shot a decent group

2020-01-13_03-31-10 by chase ditwiler, on Flickr


The 42 grain load shot lower SD of 12 but would overall shoot a little less accurately and would throw a flyer every so often.

2020-01-13_04-35-42 by chase ditwiler, on Flickr

2020-01-13_04-36-00 by chase ditwiler, on Flickr

This 42 grain group shot better but I had a primer that wouldn't ignite so it's only a four shot group (last of my loaded rounds)

2020-01-13_03-24-38 by chase ditwiler, on Flickr





Now I fully acknowledge that the flyers could have been me but those shots felt good and I was shooting off a concrete bench using bags. All the ammo was loaded at the same time and Im not sure why the flyers would be so far off. Im still fairly new at reloading so what should I be looking for to either improve the SD on the lighter load or get rid of the flyers on the hotter load?

What stock,,,, is it bedded