You may be able to use 38 Spec/357 Mag.

Run a case in and see if it sizes enough to hold a bullet.

357 maximum trimmed to length.
Trim the rim and case for diameter and thickness while cutting the extractor groove.

Or check stock at buffalo arms.

I have one and think it is a lot of fun.  It's a well-made rifle and very handy.  I was able to get 100 new unprimed cases from Quality Cartridge.  During the Pandemic they had cases in stock. $$. And I was able to find .351 plated lead bullets on line. I bought dies & shell holder from C&H.  All that was back during the Pandemic.

New 10 shot mags from one of the on-line gun parts places, Numerich?  More $. 

Then in Dec. of 2023, we had a big earthquake.  Most of my loading stuff came off the shelves.   It's still there, in a big pile, with the .351 stuff on the bottom.

.351 factory loaded stuff is marginally collectible, but you ought to be able to buy if for about $50 $75 a box.  It's only money.

I think 4227 is the best choice for powder.  You can find loads in many of the old loading books or manuals.  I like Phil Sharpe's Complete Guide to Handloading from 1937.  It's in the public domain.  You should be able to find a copy on line.

Beware of the old manuals recommendations for 2400.  Modern 2400 is hotter than the old stuff.

I haven't reloaded any cases, but I suspect case life will be short.

Winchester did their cartridge development with a High Wall (and NOT a Low Wall).  Would a .351 barrel screw into a High Wall action?

A lot of 351 shooters use 357Maximum brass. Trim to 1.375. Turn down the rim to IIRC .408. You should deepen the extractor groove too for positive extraction of unfired brass/rounds.
The fired stuff will eject just fine.

Some people  use .223 but its a rimless case and w/o that small semi rim that the orig has, you can make a big mistake a leave a loaded rd in the chamber as it may not get grabbed by the extractor.

You can use 357 and even 38spec too. No trimming, just rim dia and extractor groove work. They will be 351WSL 'Shorts' but work just fine. That semi-rim is the headspacer, so a full length case is really not needed.

The .401 you can make cases easily from 7.62x39mm.
No trimming, no rim dia work. Just expand to 40cal. Then go about reloading with .41mag dies.

Use .41Mag brass for a 'short' .401WSL but you'll need to reduce rim dia and should deepen the extractor cut.

4227 powder in the 401 seems to be the ticket. .

Fun guns

Thanks everyone for all the information. I have found the items I need from someone here. 




JMH

2152hq wrote on Nov 11^th, 2025 at 3:05pm: