140gr ELD-M Jump in SAMMI Chamber?

[FourT6and2]

Can anybody please share what the typical jump is with factory Hornady 6.5 CM 140gr ELD-M in a SAMMI spec chamber (0.199" freebore)?

0.030?
0.032?
0.050?
Something else?

 

[Jet]

This past weekend I shot some Hornady factory loaded 143ELD-X and those loaded rounds have a .060" jump. Shoot great in my barrel (.199 FB). That bullet is very similar to the 140 ELD-M

 

[FourT6and2]

This past weekend I shot some Hornady factory loaded 143ELD-X and those loaded rounds have a .060" jump. Shoot great in my barrel (.199 FB). That bullet is very similar to the 140 ELD-M

How many rounds on your barrel?

 

[Jet]

160

 

[FourT6and2]

Thank you.

Anybody else, with 140s?

 

[gme]

my notes say about .060

 

[284winner]

Can anybody please share what the typical jump is with factory Hornady 6.5 CM 140gr ELD-M in a SAMMI spec chamber (0.199" freebore)?

0.030?
0.032?
0.050?
Something else?

Hornady ELD/AMAX love to jump. Nothing is too much for them for good accuracy. For me in rifles I shoot them in .050-.080 is ideal. The ELDX is similar.

 

[FourT6and2]

Hornady ELD/AMAX love to jump. Nothing is too much for them for good accuracy. For me in rifles I shoot them in .050-.080 is ideal. The ELDX is similar.

So what is the typical jump using factory-loaded 140 ELDM in a SAAMI chamber? That's what I'm trying to figure out. It's not about how I should seat hand loads.

At 600 rounds, my rifle had a 0.032" jump using factory 140 ELDM ammo. I'm just trying to work backward and deduce what my chamber spec might have been. Because I suspect it wasn't SAAMI. My guess is when new, it had a .030" jump with factory ammo, which might equate to a .169" freebore instead of .199" (SAAMI). But I need to know what other people are seeing on a verified SAAMI chamber using the same ammo.

 

[284winner]

So what is the typical jump using factory-loaded 140 ELDM in a SAAMI chamber? That's what I'm trying to figure out. It's not about how I should seat hand loads.

At 600 rounds, my rifle had a 0.032" jump using factory 140 ELDM ammo. I'm just trying to work backward and deduce what my chamber spec might have been. Because I suspect it wasn't SAAMI. My guess is when new, it had a .030" jump with factory ammo, which might equate to a .169" freebore instead of .199" (SAAMI). But I need to know what other people are seeing on a verified SAAMI chamber using the same ammo.

Probably shouldn't have replied and waste your time. I don't shoot factory ammo. Someone will weigh in on that exact spec but sorry it's not me. I guess I thought you were wondering if too much or not enough jump would hurt accuracy with ELDs.

 

[FourT6and2]

Probably shouldn't have replied and waste your time. I don't shoot factory ammo. Someone will weigh in on that exact spec but sorry it's not me. I guess I thought you were wondering if too much or not enough jump would hurt accuracy with ELDs.

Yeah, I'm really trying to figure out freebore. Just using jump and factory ammo to work backward because I don't know what kind of reamer was used on my barrel.

 

[284winner]

Yeah, I'm really trying to figure out freebore. Just using jump and factory ammo to work backward because I don't know what kind of reamer was used on my barrel.

I think the question was asked of how many shots because you'll have some throat erosion where the freebore or throat will increase. Not much at 160 rounds but it's measurable.

 

[FourT6and2]

I think the question was asked of how many shots because you'll have some throat erosion where the freebore or throat will increase. Not much at 160 rounds but it's measurable.

That was me. I asked.

 

[FourT6and2]

Hmmm, just got off the phone with Hornady Tech Support. They said with SAAMI 0.199" free bore, I should expect 0.098" jump. Seems rather far. Almost 1/10 inch.

 

[284winner]

Hmmm, just got off the phone with Hornady Tech Support. They said with SAAMI 0.199" free bore, I should expect 0.098" jump. Seems rather far. Almost 1/10 inch.

Hornady ELDs and Amax bullet love that long jump. I jump the 162 Amax .150 in my .284 with excellent accuracy

 

[CJ6]

I'm at .005 off in a Ruger American 75 gr. ELDM's.

 

[FourT6and2]

I'm at .005 off in a Ruger American 75 gr. ELDM's.

Hand loads or factory ammo? Are the 75s that much longer than 140s?

 

[CJ6]

Hand loads. they're longer than SAMMI/Mag length. This is in 223 2.385 COAL and 1.835 CBTO length

 

[FourT6and2]

Hand loads. they're longer than SAMMI/Mag length. This is in 223 2.385 COAL and 1.835 CBTO length

I'm confused but ok thanks haha
Is my question not clear or am I just not understanding what you're saying?

 

[Idaho-Lefty]

My experience with most, 6MM and 6.5 Dia. Hornady Bullets ( Eld-M, ELD-X's and V-Maxes ) is that, they usually Like from,.. .025 to .030 min. "off" to about, .120 "off" the lands max, in My 2 Tikka SAMMI chambered Rifles ( .243 Win and 6.5 Creed ) and in my 6 XC, Criterion Barrel with, .104 Free Bore ( it liked, .040 to .050 "off" ).
But, I'd let your Rifle,.. "Tell you"

 

[Idaho-Lefty]

Personally, I start my loads at, .025 off with Hornady Bullets with, Near Max Charges of Powder and move the Bullet outward towards Lands, in .020 increments shooting 4 shot, group's ( In case, I "Pull" one, I still have, 3 to, look at).
With, 5 or, 6 sets of 4 shots each, you should have at least, One, good group. ( Take 2 Rifles to, Keep BBl,.. COOL ! )
THEN, you can "Fine Tune" around that with, Bullet depth & Powder chg. Good Luck !
You will Probably find, "best tune" with 143 ELD-X's at approx. .040 to, .090 "Off".
I'm liking .085 "off" in my, Tikka 6.5 creed with, 43.1 grs of StaBall and 143 ELD-X's but, I haven't shot enough to really "Tell",.. for sure, Yet !