Neck tension on 6.5 CM

[goinghunting]

What are you guys running and getting good results?

.003, .004, .005?

I ran the first stuff during load development at .002. Results we're ok, wondered if it was enough tension...

Was gonna run a bunch at .003 or.004 and see.

Redding type s dies

Prime 1F brass, RL16 and 143 ELDX w/GM210M

 

[JimLee]

.002 shoots best in my rifle.
RPR
Redding comp dies
Starline SRP brass
H4350
143ELDX and 140ELDM
Rem 7 1/2 Primers

You mess with seating depth yet? Sure you are on your best node? Not trying to insult your intelligence, just things I would look at also.

 

[goinghunting]

.002 shoots best in my rifle.
RPR
Redding comp dies
Starline SRP brass
H4350
143ELDX and 140ELDM
Rem 7 1/2 Primers

You mess with seating depth yet? Sure you are on your best node? Not trying to insult your intelligence, just things I would look at also.

Yep definitely on a node in my rifle, seating depth test is ready just haven't shot them yet, hoping to get time this weekend.

Mainly curious after having a 300 WSM shoot best with .0035 or so of neck tension... I know different animal and all.

 

[JimLee]

Yep definitely on a node in my rifle, seating depth test is ready just haven't shot them yet, hoping to get time this weekend.

Mainly curious after having a 300 WSM shoot best with .0035 or so of neck tension... I know different animal and all.

Well after I neck turned my brass and forgot to change my bushing I did end up seating some at .0015 tension and they shot like garbage because i believe the feed ramp was throwing them out of concentric. The RPR has a pretty sharp angle when feeding out of a mag. Not sure what you are shooting but you might want to chamber and eject a few and then measure to make sure they are not getting pushed sideways or deeper into the case while feeding.

 

[PinesAndProjectiles]

I'm running about .0015 and I think it's on the light side. This is with a .290 bushing and Lapua brass that has not been neck turned. I have a .289 bushing and will be doing a test between the two. I'd like to have a bit more, but the rifle shoots so I haven't messed with it.

 

[JimLee]

I'm running about .0015 and I think it's on the light side. This is with a .290 bushing and Lapua brass that has not been neck turned. I have a .289 bushing and will be doing a test between the two. I'd like to have a bit more, but the rifle shoots so I haven't messed with it.

Yea, give it a go, won't hurt anything. Hope that works for you.

 

[Milo 2.5]

It's rare I measure with a caliper, rather run off seating force. A .289" bushing was standard here, until we got some Lapua brass. I did a load for a guy, the load was there, but just wasn't tight, I ran some brass through a .288" bushing and whoa, I liked it. I could probably find some pics of it at 500 and 1K, but do try some more tension, easy to do.

 

[Milo 2.5]

What are you guys running and getting good results?

.003, .004, .005?

I ran the first stuff during load development at .002. Results we're ok, wondered if it was enough tension...

Was gonna run a bunch at .003 or.004 and see.

Redding type s dies

Prime 1F brass, RL16 and 143 ELDX w/GM210M

I'm all about messing with neck tensions, be warned though, if you try run .004-005" under, you may end up with the bullet outline in your necks with seated rds, like a 45acp rd. So unless you're seating your bearing surface below the neck-shoulder junction, you may end up getting gas back onto your shoulder or worse. It's early, but if the boatail junction of your bullet stops somewhere in your neck, just partial size to that point and leave the bottom part of the neck close to chamber dimensions.