Speer Bullets 40 S&W/10mm Auto 155 Grain TMJ - Box of 100

Speer Bullets 40 S&W/10mm Auto 155 Grain TMJ rounds give reloaders a straightforward, cost-effective bullet for handgun ammunition builds. Built with Speer's Uni-Cor technology, these Total Metal Jacket (TMJ) projectiles are constructed by pouring molten lead directly into the jacket, completely encasing the core in a seamless metal envelope. That design matters: it eliminates base deformation under firing pressure and keeps your loads running clean through ported compensators—a real advantage if you're using comp'd handguns at the range or in competition.

The 155-grain weight is the sweet spot for both .40 S&W and 10mm Auto, offering balanced velocity and energy across typical load data for each cartridge. Speer's double-swaging process ensures uniform heel geometry and consistent bullet diameter, so your rounds feed reliably and group predictably. Whether you're a volume shooter working up test loads, a competition reloader keeping costs down, or someone building duty ammunition, these bullets perform without the mess or fouling of traditional lead-core designs.

A box of 100 gives you enough to work up loads, run a practice session, or stock a small supply for your bench. If you're already committed to reloading for .40 S&W or 10mm, TMJ bullets simplify cleanup and extend the life of your brass and comp ports—practical advantages that add up over hundreds of rounds.

Key Features

• Uni-Cor construction: lead poured directly into jacket for complete encapsulation
• Total Metal Jacket (TMJ) design eliminates exposed lead and reduces fouling
• Compatible with ported recoil compensators—won't deposit lead residue
• Double-swaged for uniform heel and consistent diameter across the batch
• 155 grain weight optimized for .40 S&W and 10mm Auto
• Box of 100 rounds for convenient reloading sessions

Specifications

Frequently Asked Questions

Will these bullets work in ported compensators?

Yes. The Total Metal Jacket design completely encases the lead core, so these bullets won't deposit lead fouling inside ported comp slides or ports—a significant advantage over traditional jacketed bullets for high-round-count shooters using compensated handguns.

Can I use these for both .40 S&W and 10mm Auto?

Yes, the 155-grain TMJ is loaded for both cartridges. You'll want to consult current load data for your specific powder, primer, and cartridge combination to ensure you're within safe pressure ranges.

What's the advantage of Uni-Cor technology?

Molten lead is poured directly into the jacket, completely encasing the core without seams or voids. This prevents base deformation under pressure and delivers the consistent, uniform performance that double-swaging further ensures across the batch.

How many bullets come in a box?

100 bullets per box.