Should I Select a Different ELEY Batch for Warm Weather Than for Cold?

If you compete in meaningfully different conditions across the year, the sound approach is not to guess at a “summer batch” and a “winter batch”. It is to test in conditions representative of the competition you are preparing for, and let the result decide. Where conditions are genuinely freezing, ELEY builds a dedicated cold-weather range rather than asking you to adapt a standard batch.

ELEY does not publish a velocity-change-per-degree figure, so there is no arithmetic that converts a summer result into a winter prediction. What you have instead is better: published proof data for every batch, and the ability to measure the combination yourself.

Start by Testing in Representative Conditions

Every barrel has its own unique dimensions and harmonic characteristics, and each batch of ammunition performs slightly differently. What performs flawlessly in one barrel may not deliver the same results in another. Add temperature to that and you have a combination that only measurement resolves, so make your testing look like your competition.

• If your important matches are shot outdoors in winter, do your validation work in cold conditions rather than at a warm indoor range in July.
• If you shoot indoors year-round at a stable temperature, seasonal batch selection is largely a non-issue for you.
• Keep a diary. Record the full batch code, the date, the conditions and the result. Over a couple of seasons that record is worth more than any general rule.

Use the Box Mean and the Lot Analyser to Shortlist

Testing costs ammunition and time, so narrow the field before you start.

The box velocity. The lower line of an ELEY batch code (the 1045 in the worked example 10 26-04 244 over 1045) is the mean velocity across four barrels during proofing. It is a comparative marker rather than a prediction for your rifle, but it genuinely distinguishes a batch proofed near the top of a product’s band from one proofed near the bottom. ELEY tenex, match, team and club all carry a published band of 317-330 m/s (1040-1085 ft/s).

The Lot Analyser. A free account at eleyxshot.com opens the proof data behind all lots of ELEY tenex, tenex pistol, tenex biathlon, tenex rapid fire pistol, match, semi-auto .22LR benchrest precision, ultra and club: the full 200-shot proof group with X windage and Y elevation coordinates for every shot, plus velocity, group size, shot distribution, date loaded, ballistic coefficient, trajectory and radial dispersion across four barrel types. When a batch that performed well for you in a given season runs out, look it up and shortlist current batches whose profile most closely resembles it. That is as useful for matching last winter’s batch as last summer’s.

Confirm It Through Your Own Barrel

The definitive test is batch testing at an ELEY range. ELEY operates five centres: United Kingdom, Hungary, Germany, the United States and Canada. Batch testing is open to anyone. Ten shots are fired from each of up to 20 batches through your own barrel, the best-performing batches are shortlisted, and a further 30 shots are fired from those selections. You receive a 40-shot group size, a consolidating score out of a maximum 436 on an ISSF target at 50 m, a Radial Standard Deviation (RSD) figure, an Expected Score and a percentile ranking against every batch and barrel combination in ELEY’s database. Booking is at eley.co.uk/vip.

For Genuinely Freezing Conditions, Change the Product

There is a point at which the right answer stops being a different batch and becomes a different cartridge.

ELEY tenex biathlon is built on the tenex platform specifically for freezing conditions: a reduced cartridge diameter to aid cycling in bolt-action and straight-pull rifles, a scientifically designed cold-temperature lubricant with the box stating use to -20°C, and an increased propellant charge. Its velocity band is 335-354 m/s (1100-1160 ft/s) and its maximum RSD is 4.50 mm. ELEY biathlon club offers the same thinking at club level at 323-330 m/s (1060-1085 ft/s) and 5.50 mm RSD.

Note the trade-off honestly: the biathlon velocity band sits above the standard flat-nose range, so for mild conditions the standard range remains the more suitable choice for 50 m competition. This is a cold-conditions answer, not a year-round one.

The Bottom Line

Do not select batches by season from a rule of thumb, because there is no published ELEY figure that would justify one. Shortlist using the four-barrel proof mean on the box and the free proof data at eleyxshot.com, test in conditions representative of your competition, and confirm the choice through your own barrel by booking batch testing at eley.co.uk/vip. If your shooting takes you into genuinely freezing weather, move to the biathlon range, which is engineered and lubricated for it.