Choosing Small Rifle Primers — CCI 400, BR4, Federal 205, and More
8 min read
Small rifle primers go in cases with a 0.175” primer pocket — .223 Remington, 22-250, 6mm ARC, 6mm BR, 6.5 Grendel, 300 Blackout, and similar. Different primers from this family have different sensitivities, cup hardness, and flash characteristics, which can matter depending on your rifle and your load.
The five small rifle primers you'll actually see
CCI 400 — the default
Standard small rifle primer, soft cup, widely available. Ignites nearly anything. Great for bolt guns and the vast majority of .223 loads. Because the cup is relatively soft, it's not always ideal for AR-15 loads with floating firing pins — slam fires are possible with very sensitive primers. If you shoot AR almost exclusively, see CCI #41.
CCI #41 — AR-15 spec
Military-spec small rifle primer with a harder cup designed for floating-firing-pin AR-15 platforms. Same chemistry as the CCI 400, but less likely to slam-fire. If you're loading 5.56 NATO or .223 for a modern AR, this should be your default.
CCI BR4 — bench rest
CCI's match-grade small rifle primer. Same external spec as the 400, but manufactured with tighter tolerances on cup weight, anvil position, and priming compound quantity. Noticeable accuracy improvement on good rifles with good barrels. Worth the premium when you're load-developing for PRS or benchrest.
Federal 205 / 205M
Federal's standard (205) and match (205M) small rifle primers. The 205M is widely considered one of the best match primers made — extremely consistent, soft cup (same caveat as CCI 400 on ARs), and has a reputation for reducing standard deviation on long-range loads. Federal primers are famously sensitive, so mind your load data if you're substituting them into a recipe that called for CCI.
Winchester WSR
Winchester small rifle, standard cup. Often the cheapest of the big four. Some loaders swear by it for volume .223 loads. Quality has bounced around depending on production era — newer Winchester primers (post-shortage) have been solid.
When the primer actually matters
Primer choice has a smaller effect on accuracy than most people think, but a bigger effect on consistency. If you're shooting under a minute of angle and chasing single-digit standard deviation, swapping CCI 400 for CCI BR4 or Federal 205M can shave a couple fps of SD. If you're shooting 3-gun or plinking, any standard small rifle primer works.
The primer you should not substitute carelessly: magnum primers in standard load data. Small Rifle Magnum (like CCI 450) has more brisance. Substituting it for a standard primer in a near-max load can push you over pressure. Always back off 10% when switching primer families and work back up.
Shopping tips
- Primers ship with a $20–$30 hazmat fee. Buy 5,000 at a time to amortize that fee — see our hazmat guide.
- Combining primers with powder on the same order pays the hazmat fee once instead of twice.
- Prices vary by 15–20% across retailers even within the same week. Check /cheapest/small-rifle-primers before ordering.