6.5 Sherman Shortmag Load Data

[Mateo]

Went out again today and had way too much fun. Set up with target at 120,243,336,400 yards. A lot of walking though clearcut brush to get to these targets. But the sun was out and mirage was light.
Shot a .31moa 3 shot group with the 140 VLD at 400 yards with 60 gr of N570 in the NORMA brass and the 210m primer. This powder prefers the VLD bullets over the Amax. While H1000 liked the Amax better. Shot a perfect one hole, 3 shot group at 120 yards with the 150 matrix and 58.5 gr of N570. Kinda blew my mind.

 

[Mateo]

[/[ATTACH]51125.vB[/ATTACH]

 

[elkaholic]

[/[attach]51125[/attach][/quote]

That Matrix load should make some critters nervous!:D Have you chronographed that one?

 

[elkaholic]

Went out again today and had way too much fun. Set up with target at 120,243,336,400 yards. A lot of walking though clearcut brush to get to these targets. But the sun was out and mirage was light.
Shot a .31moa 3 shot group with the 140 VLD at 400 yards with 60 gr of N570 in the NORMA brass and the 210m primer. This powder prefers the VLD bullets over the Amax. While H1000 liked the Amax better. Shot a perfect one hole, 3 shot group at 120 yards with the 150 matrix and 58.5 gr of N570. Kinda blew my mind.

How far off the lands were you with the Matrix? (coal).......Rich

 

[KMG]

Not trying steel your thread. I'm curious if anybody has annealed their SS brass. I've got 3 firings on mine this far & was wondering if I should start this as a regular part of my reloading process?
Thx KMG

 

[Mateo]

I anneal mine every 3rd firing. I believe neck turning and annealing play a huge part in accuracy. Especially so in the 6.5 SS and all the brass work involved.

 

[Mateo]

How far off the lands were you with the Matrix? (coal).......Rich

Not sure how far off the lands. Coal was 2.93? My seating die is still set at that length. When I reload again I'll measure and let you know rich.

 

[elkaholic]

Not sure how far off the lands. Coal was 2.93? My seating die is still set at that length. When I reload again I'll measure and let you know rich.

I would say you are mighty close which is usually where they shoot.....Rich

 

[264WM]

Does anyone know if the N570 is the same as the old H570 as I have 3 lbs. of the H570 that I am using in my 264WM. I have reached 3269 fps. with the 160gr Woodleigh PPSN with 73gr of the H570 in my 264WM but it is showing signs of pressure. That powder seems to work best with the heavy bullets. I have found that H4831 works very good with the lighter bullets 85gr, 95gr and 100gr in the 264WM with great accuracy and the 85gr Sierra is smoking at 3839 fps with 73gr H4831. I have a Remington 721 with a Shilen 30" barrel with 6 grove and 1in 8 twist. I enjoy all the info on the 6.5 SS as it is a interesting build. Is there brass available for it or do you have to manufacture it? Do you have a cartridge diagram for it? I am thinking that it would be perfect for a scout size rifle such as the Savage.

 

[elkaholic]

Does anyone know if the N570 is the same as the old H570 as I have 3 lbs. of the H570 that I am using in my 264WM. I have reached 3269 fps. with the 160gr Woodleigh PPSN with 73gr of the H570 in my 264WM but it is showing signs of pressure. That powder seems to work best with the heavy bullets. I have found that H4831 works very good with the lighter bullets 85gr, 95gr and 100gr in the 264WM with great accuracy and the 85gr Sierra is smoking at 3839 fps with 73gr H4831. I have a Remington 721 with a Shilen 30" barrel with 6 grove and 1in 8 twist. I enjoy all the info on the 6.5 SS as it is a interesting build. Is there brass available for it or do you have to manufacture it? Do you have a cartridge diagram for it? I am thinking that it would be perfect for a scout size rifle such as the Savage.

I doubt that H570 is the same but it is in the same zip code as far as burning rate. H870 (the ball version) gave even better velocity than 570. You can still buy it at Thunderbird cartridge in Az. under the name T870.
As far as the SS goes, I was the developer of that cartridge, along with some help from "Bigngreen". You do have to form the case from the SAUM parent but it isn't that difficult with a little practice and it lasts a LONG time! I am in the process of having head stamped brass made but am a little short of pulling the trigger on it yet. I think the odds are good though.
The SS case is within a grain of the SAUM but is considerably shorter and more efficient, as the performance proves. I just built a 7SS on a Savage and it is a sweet setup! I can reach 3050' with the 180's in a 26" barrel and still fit the cartridges easily in the DBM......Rich

 

[Mateo]

I would say you are mighty close which is usually where they shoot.....Rich

Just checked the COAL tonight. It's 2.93" for the 140 VLD and 2.915 ish for the 150 gr matrix. The beauty is in that it's the same setting on the seating die. No checking if you are set for 150 or 140 gr. just seat them all.

 

[elkaholic]

Just checked the COAL tonight. It's 2.93" for the 140 VLD and 2.915 ish for the 150 gr matrix. The beauty is in that it's the same setting on the seating die. No checking if you are set for 150 or 140 gr. just seat them all.

Ya, I have noticed that too. It also seems to work with the 140 A-Max.....Rich

 

[Mateo]

Found some 139 lapua scenars yesterday when I went to pick up 2 kg of N570. Curious how they will do. Never seen them before up here in Canada so had to grad them. Here's a reloading question. My pressure signs have been a bit strange and thru got me thinking. It was only when pushing the 130 VLD with H1000 at insane speeds did I ever get the trifecta of visible pressure sign. ( flattened primer, hard bolt lift, and ejector mark)
Now with N570 I feel I'm at a mild load ( speed gave me that hint) with great accuracy. I want to stay with a mild load to prolong barrel life. Anyway. I would get the odd ejector mark. While other times nothing. I went out shooting not long ago when it was raining and snowing and the cases got damp with a few drops of blown rain. Now the ejector mark was obvious! But no other signs. I did some research and found that water will create a hydrolic barrier and not let the case grip chambers walls very well. And that made perfect sense. Especially with the short fat case.
Now, I've started using EEZOX to condition my bore (love the stuff) for predictable cold bore shots. But I usually do this without a bore guide and I know some goes on the chamber walls. I mop the chamber after and run a dry patch down the bore to remove excess. But being a lubricant (dry lube, goes on wet) will this be why I'm seeing ejector marks on what I thought were mild loads? What about spray on case lube? I've always left it on the cases to help with feeding as I never thought it would do any damage. Am I messing up a fundamental step in reloading? Should brass and chamber be completely clean metal?

 

[elkaholic]

Found some 139 lapua scenars yesterday when I went to pick up 2 kg of N570. Curious how they will do. Never seen them before up here in Canada so had to grad them. Here's a reloading question. My pressure signs have been a bit strange and thru got me thinking. It was only when pushing the 130 VLD with H1000 at insane speeds did I ever get the trifecta of visible pressure sign. ( flattened primer, hard bolt lift, and ejector mark)
Now with N570 I feel I'm at a mild load ( speed gave me that hint) with great accuracy. I want to stay with a mild load to prolong barrel life. Anyway. I would get the odd ejector mark. While other times nothing. I went out shooting not long ago when it was raining and snowing and the cases got damp with a few drops of blown rain. Now the ejector mark was obvious! But no other signs. I did some research and found that water will create a hydrolic barrier and not let the case grip chambers walls very well. And that made perfect sense. Especially with the short fat case.
Now, I've started using EEZOX to condition my bore (love the stuff) for predictable cold bore shots. But I usually do this without a bore guide and I know some goes on the chamber walls. I mop the chamber after and run a dry patch down the bore to remove excess. But being a lubricant (dry lube, goes on wet) will this be why I'm seeing ejector marks on what I thought were mild loads? What about spray on case lube? I've always left it on the cases to help with feeding as I never thought it would do any damage. Am I messing up a fundamental step in reloading? Should brass and chamber be completely clean metal?

I prefer CLEAN brass and a CLEAN chamber. No oils........Rich