Question for Rossi ‘92 45 COLT shooters

[cwlongshot]

I picked up a rifle last weekend. I have been searching for a 454 for many years never finding one. I have a new friend and he has one! I was not aware how different they where and actually dont like them as much now. I know that the rifles are very different from each other is terms of wood fit and smoothness.

Any how, I went right out and bought this rifle as I have been looking at it for a year in a shop. Its much nicer than the 454, nicer in function and esp looks. The 454 was plain 20” round bbl, and almost orange wood and awful butt pad. While mine is case colored dark oiled wood and octagon bbl.

Any how, cleaning it, I discovered it seems to have a 1:38 ish twist. SO miggt mot like my prefered heavy cast bullets.

What have you found with yours? Will it shoot 300g bullets?

Thank you,

CW

[Stopsign32v]

I've never had a need to shoot over 250gr 45 Colt in mine. I don't see why it wouldn't though.

With that said mine absolutely loves 9gr Unique under a 250gr. Very accurate out to 100 yards.

[Froogal]

I shoot 200 grain bullets in mine. The rifle seems to like them. I've never tried anything else. I use 8.5 grains of Unique. I'm into C.A.S. and plinking. If I miss the target, it is my fault.

[lar45]

I shoot a lot of the 270's from hunter's supply in mine and it shoots great.
I too wish that it had a faster twist.

[Harter66]

Had 2 of them .
I duplicated the experiment over and over so I know that at least in the 16" and 20" examples with measured 1-32" twist barrels that you have to go hot enough to stay supersonic all the way to the target or not go supersonic at all .

I had a 350 I bought for a 45 Raptor that would in fact stablize but not terribly accurate .

The rifles were an 82-86' round 20" barrel and a 2013 16" round barrel .
The older rifle was very nice with nice wood and very good fitting .
The newer one , the first one I bought , has boring wood and serviceable fitting . It's off for a 1-16" barrel in a slightly heavier profile . Among other things the front sight dove tail is too deep and grew a divot underneath it . The chamber is 1.305 and .491 which doesn't play at all nice with my .484 Ruger BlackHawk brass . Fire form and neck size is the answer to closing groups . Neither would feed RP brass . Neither was particularly fussy about bullet shape . Backed off to 8.5 Unique with most 250-265 bullets accuracy was good enough to shoot to 100 yd . Stepped up to 9.5 gr groups at 25&50 were much better and picking off golf balls at 75 was readily available but I'd miss the 8' berm at 105 yd shooting at a steel ram at 100 yd consistently departing line of flight at 10:00 between 78-82 yd .

If your SN starts with an M it is made on a 44 mag compatible action and at least mine were unremarkable with loads up to 20 kpsi estimated as middle RBH loads .

[mehavey]

1-38 twist is just fine for heavy-bullet 45 Colt rifle loads:
See https://thefiringline.com/forums/showpost.php?p=5287562&postcount=17
(Marlin 1:38)

[cwlongshot]

I was thinking that the 44 wa sthe one plagued with that along with fat barrels! I have a few Marlin 45’s and know for a fact that my shorty is 1:20 as I compared it to this one just last week. Ill have to check the others.

Hopefully tomorrow will tell!

Cw

[mr surveyor]

I may be wrong, but I believe that all Rossi R92 barrels are 1:30 twist


jd

[mehavey]

In ref to Post #6 (http://castboolits.gunloads.com/showthread.php?385464-Question-for-Rossi-%9192-45-COLT-shooters&p=4695200&viewfull=1#post4695200)/Marlin twist, . . .
See https://www.marlinfirearms.com/lever-action/model-1894/model-1894-45-colt

[cwlongshot]

I may be wrong, but I believe that all Rossi R92 barrels are 1:30 twist


jd
Its entirely possible!! Mine is not a exact science. :) I had about a 1/2 revolution for about 18” and doubled it... hadent seen 1:36 so called it 1:38. :)

Cw

[Harter66]

1-32 ......... I measured them with a tight brush and patch , bore scope , and the 16" example comes up about 1 land width short of a half turn visually from muzzle to chamber throat land end . The chamber 1.305 in length .

[cwlongshot]

I shot this today!!

I shot light lead 255’s & 300’s. Heavy 240 & 300’s and my fav 10g Unique and a 270 HP.

Everything shot great!! Those 270’s where my favorite!! And I was hitting out @ 50 yards very well. Only used targets to 25 yards but I could hit a golf ball 90% of the time.

My sight regulation was SPOT ON! I had to elevate one click above center if elevator and tweaked the front site left and rear right so to keep things even. I do want to lock tite the sites because Rossi dovetails... well they kinda suk. :)

Very happy!

CW

[bangerjim]

I shoot 300gn 45's out of my Rossi long guns all the time with excellent performance. They are all PC'd boolits. Velocity is low enough you can almost watch the boolit go down range! (almost!) And when it hits........OMG! That is a big piece of lead destroying whatever it hits!

My wife finds her most accurate shooting performance is with the 45 long guns and those 300gn slugs.

banger

[Drew P]

I wonder if a heavier than theoretical maximum weight bullet for the twist could be used if it had a hollow point design? Of course removing metal from nose is working against the gain of weight, but hollow points are known in long range rifle to add stability.

Looking at the Accurate 450-300z and imagining a generous hollow point on it. Maybe reducing it to 285g or so. The no groove design also helps shift BC rearward.

246183

[cwlongshot]

We all have said weight as it pertains to the rifling twist. But we say this because a heavy bullet for a given caliber will be a long bullet. The bullets actual Bearing surface is whats making the difference as to what rifling will be optimal.
So a more correct sentence might be a “longer bullet requires a faster twist than a short stubby bullet. The bullets actual weight is irrelevant.

CW

[mehavey]

Try this calculator
http://www.geoffrey-kolbe.com/barrel_twist.htm
(note the trans-sonic effect)

[Drew P]

We all have said weight as it pertains to the rifling twist. But we say this because a heavy bullet for a given caliber will be a long bullet. The bullets actual Bearing surface is whats making the difference as to what rifling will be optimal.
So a more correct sentence might be a “longer bullet requires a faster twist than a short stubby bullet. The bullets actual weight is irrelevant.

CW
Huh, never knew that. That explains why the hollow points for long distance accuracy are so tiny. Still might help a heavy 45 in a slightly slow twist barrel?

[mehavey]

The match hollow point also moves the center of gravity far behind the center of pressure while moving at high speed through a fluid . . .
-- AND --
The bullet's effective mass is far shorter than its effective length . . . . . just spinning in place.