The standard primer size used by .350 Legend ammunition is the small rifle primer. Factory loads and published reloading data rely exclusively on standard small rifle primers to handle the high operating pressures of the cartridge. Both standard and small rifle magnum primer variations share identical outer dimensions, though magnum choices are sometimes preferred for hard to ignite ball powders.
350 Legend Primer Size
| Cartridge | Primer Size | Primer Type | Source | Notes |
|---|---|---|---|---|
| .350 Legend | Small Rifle | SR (Small Rifle) | SAAMI | Standard small rifle primer is universally utilized for factory loads and reloading data. |
.350 Legend Primer Size Explained
Primer size defines the physical dimensions of the metal ignition cup pressed into the base of the brass case. The standard .350 Legend primer type is the small rifle primer, abbreviated as SR on component reference charts. According to established industry standards, a standard small rifle primer diameter ranges from 0.1745 to 0.1765 inches. Primer selection is critical because rifle cartridges generate high operating pressures up to 55,000 PSI, requiring thicker primer cups to prevent punctures. Using the correct primer ensures uniform powder ignition and predictable velocity across different firearms.
.350 Legend Primer Dimensions
| Primer Specification | Measurement | Unit | Source |
|---|---|---|---|
| Primer Type | SR (Small Rifle) | N/A | SAAMI |
| Primer Diameter | 0.1745 to 0.1765 | Inches | SAAMI |
| Primer Pocket Diameter | 0.1730 to 0.1745 | Inches | SAAMI |
| Primer Pocket Depth | 0.1170 to 0.1230 | Inches | SAAMI |
.350 Legend Small Rifle Primer vs Other Primer Sizes
The .350 Legend uses a small rifle primer because its case head is machined specifically for these dimensions. When evaluating primer choices, a small rifle primer shares the identical 0.175 inch nominal outer diameter as a small pistol primer. However, small rifle primers feature thicker cup walls and stronger metal alloys to withstand rifle pressures reaching up to 55,000 PSI, whereas pistol primers would rupture under such intense forces. A large rifle primer measures roughly 0.210 inches in diameter and is far too wide to fit into the small primer pocket of .350 Legend brass.
.350 Legend Primer Brands
Major ammunition and component manufacturers offer reliable small rifle primers appropriate for loading .350 Legend. CCI produces the CCI 400 standard small rifle primer alongside the harder cup CCI 450 magnum primer. Federal Premium provides the Federal 205 small rifle primer. Winchester manufactures the WSR standard small rifle primer, and Remington supplies the 6 1/2 small rifle primer. Each manufacturer builds these components to meet strict industry tolerances, ensuring a secure fit inside .350 Legend primer pockets.
.350 Legend Primer Size And Reloading Data
The primer represents a single component within a comprehensive and tested load recipe. A published reloading manual specifies an exact combination of bullet weight, powder charge, primer brand, brass case, and cartridge overall length. Swapping component types or changing primer brands can alter internal ballistics and elevate chamber pressure. Handloaders must follow published component combinations precisely to maintain safe operating parameters and achieve optimal accuracy.
.350 Legend Primer Size vs .450 Bushmaster
| Cartridge | Primer Size | Primer Type | Source |
|---|---|---|---|
| .350 Legend | Small Rifle | SR | SAAMI |
| .450 Bushmaster | Large Pistol | LP | SAAMI |
When comparing .350 Legend vs .450 Bushmaster primer size, the two straight walled hunting cartridges utilize completely different components. The .350 Legend relies on a small rifle (SR) primer because its case head architecture is derived from small primer profiles. In contrast, the .450 Bushmaster utilizes a large pistol (LP) primer pocket. This fundamental difference means handloaders must maintain entirely separate priming tools and inventory for each caliber.
Manufacturer Specifications vs Actual Components
Official industry specifications establish baseline blueprints for cartridge manufacturing, while actual components experience minor dimensional variations. SAAMI guidelines dictate standard tolerances for commercial primer dimensions and primer pocket depths. Individual brass lots and primer batches fluctuate slightly within these permitted limits. This variance explains why certain primer brands seat more tightly in specific brass brands, requiring reloaders to monitor seating resistance during assembly.
FAQs
What primer size does .350 Legend use?
When checking what size primer for .350 Legend is required, the correct specification is the small rifle primer.
Is .350 Legend a small rifle primer?
Yes. For anyone asking what primer does .350 Legend use, the cartridge relies exclusively on small rifle primer pockets.
What size primer does .350 Legend brass use?
The correct .350 Legend brass primer size is a standard small rifle primer measuring between 0.1745 and 0.1765 inches in diameter.
Does .350 Legend use the same primer as .450 Bushmaster?
No. While both are popular straight walled deer hunting rounds, .350 Legend uses a small rifle primer whereas .450 Bushmaster uses a large pistol primer.
What is the diameter of a .350 Legend primer?
According to standard industry specifications, a .350 Legend primer diameter ranges from 0.1745 to 0.1765 inches.
Can you use a small pistol primer in .350 Legend?
No. Small pistol primers have thinner cup walls that will rupture under the high 55,000 PSI operating pressures generated by .350 Legend firearms.
Does primer choice affect .350 Legend load data?
Yes. Changing primer brands or switching between standard and magnum components alters ignition characteristics and pressure curves.
What primer brands are available for .350 Legend?
CCI, Federal, Winchester, and Remington all manufacture standard small rifle primers suitable for this cartridge.