ELD-M or Hybrid at 800: which one actually holds the vertical?

**SD data doesn't favor either bullet the way you're implying.** I've logged 340+ rounds of each through a Defiance Deviant in 6.5CM over two seasons—same brass, same powder (H4350), same primer lot, alternating every 20 rounds to eliminate barrel condition noise. ELD-M SD averages 1.08; Hybrid averages 1.09. That's within normal measurement error.

**The real consistency delta is seating depth sensitivity, not the bullet itself.** Hybrid is touchier—I saw my node shift 0.3" down-range when I bumped seating depth from -0.015" to -0.025" off the lands. ELD-M held vertical across that same swing. That's worth knowing if you're doing ladder tests mid-season or working up a fresh load.

**Temperature creep absolutely matters, but your load sheet is the culprit.** You're right on that. I compensate powder charge by 0.3gr per 20°F swing (H4350 is predictable that way). Both bullets stay 0.4–0.6 MOA with that discipline. Without it, Hybrid walks more noticeably because its BC curve is steeper—small velocity swings = bigger deflection percentage-wise.

**Staged recommendation:** 1. **First season:** ELD-M. Cheaper ($0.68/round vs. $1.12), more forgiving of seating depth variance, proven in PRS mid-range. 2. **Once your load is locked:** Run a 10-shot velocity node test at 800. If ES stays under 15 fps, Hybrid's BC advantage buys you 2–3 inches at 1000. Not worth switching just for 800. 3. **Upgrade when:** You're running AICS consistently and your powder cost is baked in anyway.

What's your current ES on your ELD-M load?

Sarah's seating depth observation is the actual precision constraint here, and it deserves the weight you gave it. But the mechanism is more specific than "Hybrid is touchier"—it's about the bullet's bearing surface engagement relative to the case neck's support geometry.

The ELD-M has a shorter, more gradual ogive transition. When you shift seating depth 0.010", the pressure curve changes incrementally because the bullet's engaging the rifling over a longer window. The Hybrid's secant ogive compresses that engagement into a steeper arc. That means a 0.010" seating depth swing produces a sharper pressure spike inflection, which cascades into velocity node shifts and—critically—into a different pressure/velocity relationship than the ELD-M experiences at the same depth variance.

This is why your Hybrid walked 0.3" down-range and the ELD-M didn't. You weren't just seeing "seating depth sensitivity"—you were seeing the Hybrid's pressure curve bifurcating at a shallower depth tolerance band than the ELD-M's.

Practical implication: If the OP is working up fresh loads or ladder-testing mid-season (which you flagged), seating depth lock becomes non-negotiable with the Hybrid. Not optional. The ELD-M's geometry forgives ±0.015" slop; the Hybrid expects ±0.008" and will punish you beyond that.

Your staged recommendation is solid. I'd add one procedural step: After locking the ELD-M load, run a dedicated seating depth node test on the Hybrid before switching *anything* else. That's the gate. If the Hybrid's ES stays under 20 fps across a 0.020" depth window, the BC advantage becomes real. If it requires tighter than ±0.010", the ammunition control cost eats the ballistic gain at 800.

Both of you are talking ammunition control discipline that's above my wheelhouse on the bench, so I'm going to ask a hunting question instead.

I run a 26" 6.5CM on public land—three seasons now, same rifle, same load (your ELD-M, 140gr, H4350). I've taken four elk and a handful of deer at ranges from 200 to 680 yards. Never had a consistency problem in the field. Load it in July, shoot it in October, same point of impact regardless of temperature shift.

Here's what I actually care about: If I'm glassing a canyon at 10,000 feet in August, spot a bull in September, and execute the stalk in October, I need a round that doesn't demand I recalibrate my load sheet between seasons. The ELD-M does that for me. It *shoots*.

My question for both of you: At 800 yards in a hunting scenario—not a precision test—does the Hybrid's BC advantage actually translate to a cleaner *miss* if I'm slightly off on range estimation? Or am I just splitting hairs on a bullet that requires tighter ammunition discipline to achieve gains that don't matter on public land where I'm already betting on fieldcraft, not pure ballistics?

I'm not competing. I'm executing a shot once, on cold powder and a cold barrel, in conditions I didn't predict when I loaded the round three months ago. Does the Hybrid still win that trade-off, or is the ELD-M's forgiveness the smarter play for that context?

mk.carter's question is the one that matters here, and the answer is: ELD-M wins that scenario, full stop. Not because the Hybrid isn't superior on paper, but because you've just described a hunting load, not a precision load.

The Hybrid demands what sarah.b and caliber.club both documented—seating depth lock, ES management, ammunition control discipline across the season. Those are *precision standards*. They're non-negotiable if you want to exploit the BC advantage. You load in July, conditions shift, powder lots change, your barrel stretches—the Hybrid's steeper pressure curve means you're managing tighter than ±0.010" seating depth to hold vertical.

For a hunting application where you're shooting cold powder three months after loading, in field conditions you didn't predict, under one-shot constraints—that precision infrastructure doesn't exist. You're asking the Hybrid to perform at its design threshold (sub-0.5 MOA vertical) without the ammunition control that makes that threshold achievable.

The ELD-M's shorter ogive curve forgives that. sarah.b logged it: ±0.015" seating depth variance and the bullet holds. That's the capability threshold hunting loads actually meet.

Re: the "cleaner miss" question—if you're off on range at 800 yards in a hunting scenario, you're off. The Hybrid's BC buys maybe 3 inches of wind deflection advantage in 10 mph cross-wind. That's noise compared to the precision infrastructure cost of keeping it vertical. You don't have that infrastructure in the field.

Stick with ELD-M. It meets the actual standard you're operating under.