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Post by Quick Draw McGraw on Nov 26, 2016 16:33:41 GMT -5
My .454 SRH shoots great and works great, but my chrony says my velocities are coming in low with Factory ammo and with handloads. The accuracy is honestly very good, and I have the 7.5" barrel. Curious if anyone has thoughts on what my issue may be. Cylinder gap too big maybe?
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Post by Alaskan454 on Nov 26, 2016 19:13:42 GMT -5
The throats on mine are .455, what size bullets are you running? Might be struggling to seal the gap and build pressure. Linebaugh has written about the same issue with the 45 Colt Blackhawks.
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Post by Quick Draw McGraw on Nov 26, 2016 19:50:21 GMT -5
Typically they are .452", so that would make sense.
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Post by Alaskan454 on Nov 26, 2016 20:45:37 GMT -5
Mine didn't shoot very well with cast bullets unless I used .454s. The .4525 jacketed seem to run well at +P Colt up to Casull levels but I'm sure they lost a bit of velocity.
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Post by bradshaw on Nov 26, 2016 20:54:58 GMT -5
Quick Draw McGraw..... the Freedom Arms Model 83 .454 Casull is notable for 1) near zero chamber/bore misalignment, 2) firm chamber exit holes, 3) barrel/cylinder gap of .001” or not much more, 4) short forcing cone, and 5) generous groove diameter. All these factors except chamber-to-bore alignment add up to VELOCITY. Fine chamber/bore alignment probably doesn’t hurt. Close dimensions on throat, gap, and forcing cone become good friends of velocity, especially when chamber pressure is high. Dick Casull’s .454 is a Rocks & Dynamite cruiser. Any revolver without the dimensional starch bleeds beaucoup gas under high pressure. That is the nature of the beast, the beast being the cartridge.
Dick Casull set out to design a cartridge and a revolver for that cartridge to take the revolver where it hadn't been, C4 concussion and George Foreman recoil be damned. Gas is always looking for a way out. Picture a revolver with oversize throats and a wide cylinder gap. Now light up one of Dick Casull’s creations. Gas moves faster than the bullet, expanding around the shank, finding daylight, greeting the atmosphere in cacophonous celebration. Whatever gas is left pushes the bullet down the barrel. We have choreographed a Super Redhawk against a Model 83 .454, side-by-side. The Freedom Arms won. Heavy bullets, especially heavy cast, may start to level the playing field.
David Bradshaw
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groo
.327 Meteor
I yet live!!!!
Posts: 855
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Post by groo on Nov 27, 2016 14:10:29 GMT -5
Groo here
+1 Mr Bradshaw.
My early FA454's will not even chamber a factory 45 Colt!
Also no reloads unless the bullets are .452 or less and the cases sized with a REAL 454 Casull sizer.[mine are Pacific's from Freedom Arms]
The Ruger and Taurus guns are loose in comparison.
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Post by Quick Draw McGraw on Nov 27, 2016 22:25:14 GMT -5
Lots of good points here. With as accurate as it is, I may just say "oh, well," and live with it. How do I measure my throats?
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Post by zeus on Nov 27, 2016 22:29:31 GMT -5
What load and velocity are you getting?
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Post by Quick Draw McGraw on Nov 27, 2016 22:46:56 GMT -5
What load and velocity are you getting? Here's what I have gotten from factory ammo: Hornady 240gr XTP Mag: Stated Velocity: 1,900 fps Measured Avg Velocity: 1,760 fps Rounds measured: 20 Hornady 240gr XTP Mag: Stated Velocity: 1,900 fps Measured Avg Velocity: 1,834 fps Rounds measured: 20 Underwood Hornady 240gr XTP Mag: Stated Velocity: 1,900 fps Measured Avg Velocity: 1,722 fps Rounds measured: 17 |
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Post by zeus on Nov 27, 2016 22:50:11 GMT -5
Most of the time those velocities are not from vented barrels. For a comparison, my 10" FA shoots a 260 at 1890 on average so I'd say your doing pretty well with a 7.5" Ruger honestly. It is plenty of velocity. Have you shot something with it? I assume not or this question wouldn't even come up as a 240 at over 1800 is quite impressive on a deer  I don't think you have anything to worry about. I think sometimes velocity is worried about too much with a revolver and it just isn't that big a deal with these size bullets. Go whack something with that thing and I think you'll be thrilled. |
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Post by Quick Draw McGraw on Nov 27, 2016 23:27:42 GMT -5
Makes sense. I have more issues with my reloads. Not sure if it was my reloading skills or the firearm.
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Post by zeus on Nov 28, 2016 1:25:12 GMT -5
What issues with the handloads? inconsistent crimps etc? what is your powder and primer choice?
I strongly suggest performing the seating and the crimp in two separate stages for the 454. A good crimp is nice on a round that has the recoil impulse that the Casull has.
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I don't think you have anything to worry about. I think sometimes velocity is worried about too much with a revolver and it just isn't that big a deal with these size bullets. Go whack something with that thing and I think you'll be thrilled.