The Speer TMJ .38 Cal Bullets, 158 gr (Speer part no. 4207) is a 158-grain Total Metal Jacket (TMJ) bullet from Speer‘s TMJ line, sized for .38/.357 cal (.357-.359 in.) and sold 100 per box for reloaders working up their own ammunition rather than buying it loaded. Speer’s Uni-Cor process fully encases the lead core in a seamless jacket, unlike a standard FMJ that leaves lead exposed at the base. Runs cleaner and more consistent than a conventional FMJ bullet. Reloaders pick a bullet like this specifically for the terminal performance and consistency it brings to a handload that a generic, unbranded projectile can’t match.

Key Specifications

• Sized for .38/.357 cal (.357-.359 in.) at 158 grains.
• Bullet type: Total Metal Jacket (TMJ).
• Sold 100 per box, ready for the bench.
• Speer’s Uni-Cor process fully encases the lead core in a seamless jacket, unlike a standard FMJ that leaves lead exposed at the base.
• Runs cleaner and more consistent than a conventional FMJ bullet.
• Sold as bullets only — brass, powder, and primers are needed separately to complete a round.
• Part of Speer’s TMJ product line, not a generic unbranded bullet.

Frequently Asked Questions

What is this 158 gr bullet best suited for? It’s built as a total metal jacket (tmj) in Speer’s TMJ line — see the description above for the specific use Speer designs this line around.

Does this come loaded or as a component? This is a reloading component — 100 per box of bare bullets for handloaders, not loaded ammunition.

Will this fit my existing dies and seating stem? It’s sized to standard .38/.357 cal (.357-.359 in.) bullet diameter, so it should run in dies and seating stems built for that caliber — always check your seating stem profile against the bullet’s ogive first.

Buy the Speer TMJ .38 Cal Bullets, 158 gr

Add the Speer TMJ .38 Cal Bullets, 158 gr to your next batch for consistent, brand-name performance instead of an unknown-quality bullet. Order it through our Lubbock, Texas gun shop, and browse our reloading bullets selection for more calibers and weights.