Rossi Braz .357, Heavy Bullet Stabilization with 1-30 Twist

The Rossi Model R92, a lightweight carbine for Cowboy Action, hunting, or plinking! Includes Rossi manufactured Interarms, Navy Arms, and Puma trade names.
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paul105
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Rossi Braz .357, Heavy Bullet Stabilization with 1-30 Twist

Post by paul105 »

Hi, newbie here.

I have two recent Rossi Braztech .357s -- a 20" Oct Rifle and a 16" SS Trapper. After buying these rifles, I read that the new .357s have a 1-30" twist and won't stabilize bullets heavier than 125gr. I did the cleaning rod test and sure enough, both of my rifles have the 1-30 twist. Also looked at various rifling twist/bullet length calculators which seem to agree with the 125gr max.

I had been experimenting with Beartooth Bullets 185gr FNGC bullets over H110 for a chronographed (5 ft from muzzle, and 56 deg f) 1,691 fps from the 20" rifle. Just to see for myself, I shot a three shot group at 100 yards using the 20" M92 and a Tarus tang sight. The group measure 2 1/2" with two almost touching and there was no sign of bullet instability on the target.

Would appreciate others experience/comments re heavier bullets (158gr -- 185gr) in these 30" twist guns.

Thanks,

Paul
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44-40 Willy
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Re: Rossi Braz .357, Heavy Bullet Stabilization with 1-30 Tw

Post by 44-40 Willy »

You've got me wondering about the twist in my 1999 vintage. It's darned accurate with 145gr bullets.
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Re: Rossi Braz .357, Heavy Bullet Stabilization with 1-30 Tw

Post by Ranch Dog »

Greetings Paul. I feel the bullet stabilization formulas are theory personally and nothing more. The 444 Marlin with it's 1:38 has made me a believer in that thought as it does not have any issues with heavy bullets that fit. I have been shooting my R92 with my 175-grain bullet and I have customers shooting my 190-grain bullet without issue. Those using my TLC359-190-RF have been using 38 Spl brass because of the longer bullet nose but shoot the cartridge at 357 Mag max loads. All this with very accurate results.
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Re: Rossi Braz .357, Heavy Bullet Stabilization with 1-30 Tw

Post by Deleted User 327 »

I've shot thousands of Zero 158grn JSP bullets in both my carbine and rifle and can report that they shoot very accurately too, even out as far as 300yds. Further, I've also shot 158grn Berry's plated bullets with equally good results. In addition, I've run the Zeros as fast as 1,977fps in my rifle and 1,941fps in my carbine with excellent accuracy too.
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Re: Rossi Braz .357, Heavy Bullet Stabilization with 1-30 Tw

Post by pricedo »

I don't know how much spin my 16" bbl Rossi M92 in 357 Mag puts on the bullets but I can punch the 10-ring right out of a standard pistol target at 50 yards with the forearm resting on a sandbag without any flyers using the Federal "red box" 158 grain SP-FN factory cartridges and that's goodn'uf for me. :D
Picked up 10 @50 round boxes on sale at Cabelas a while back & they'll do me for a long while.
I'm not a prolific paper or steel puncher and when I go "bang" a dead carcass usually hits the ground in the near vicinity.
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paul105
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Re: Rossi Braz .357, Heavy Bullet Stabilization with 1-30 Tw

Post by paul105 »

Thanks for the replies. Inspired by COSteve I just bought a globe front sight for the 20" short rifle. When I get around to installing it I'll run some tests at 200 yards with 158 - 180 gr bullets.

You have a great site here, wish I had found it sooner,

Paul
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