Robert Sir,
Yes, you can safely fire both .357 Magnum and .38 Special in a compatible lever-action rifle, but always verify your firearm's specifications, use the correct ammunition types, and practice safe handling. If uncertain, consult the rifle’s manual or a firearms professional.
The caliber you should monitor for carbon build-up is mainly the .357 Magnum due to its higher pressure and potential for increased fouling. Regular cleaning after shooting magnum rounds can help maintain optimal performance.
Hopefully the above info helps Robert Sir, please take care and stay safe 🙏

100 % Yes!!!! I do utilize both in my Henry Levergun!!! .38 shoots a bit softer than the .357 magnum rounds.

Yes sir, you absolutely can shoot both. Happy shooting!

Good evening to you!! Yes you can fire both
357 and 38 ammo in your 357 lever gun. Hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸

Yes, you can.

Hi Robert, yes sir, you can safely fire .38 Special ammunition in a lever action rifle chambered for .357 Magnum. However, be aware that using .38 Special frequently can lead to a carbon ring buildup, which may affect the chambering of .357 Magnum rounds later on.
Stay safe & have a great day!

Yes. I do.

Hi Robert and welcome. Yes Sir you can, no issue whatsoever in a .357mag chambered lever rifle. Cheers, stay safe and enjoy!