Sighting in '58's percussion vs with R&D conversions

[Pukin Dog]

I had loaded up some 45LC brass with 25gr ffg and grits filler and loaded half of them with a round ball and the other half with the PRS 250gr bullet.

The round ball shot about 3" low at CAS ranges (i.e. 25').  The PRS shot about 2" high.

I want to do some more testing but do I add or subtract powder to make the impact higher?  i.e. go to say 20 or 22 gr to raise the round ball impact?  Obviously I will reverse the process to lower the PRS impact.

[Silver Creek Slim]

I am no expert. I think you have to increase the powder to get higher impact, because it will produce more pressure and recoil. The PRS is producing more pressure and recoil, hence the higher impact.
Experts, I am correct or all wet?

Slim

[Delmonico]

Yer both Slim, longer barrel time will also make them shoot higher.  PD as they say, the proof in in the pudding.  Try it and see, that is the most lilely in this case.  But If the Ballistic Gods don't like you it could cause them to shoot to the side.   Firearms are persnickerty things when it comes to sterin' bullets out the end.  Seen some funny things happen over the years.  

Don't ever let anyone fool ya, if they claim to be an expert in ballistics stear clear.  To many varibles to ever be sure.  But that is the fun of it.  If you could just load up and the gun hit where you want each and every time would it be any fun.

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[Qball]

When trying to find a sillywet round in .357mag and .44mag.
The more the bang the lower the hit. Maybe straighter trajectory? (pardon spelling)
Dont know if that relates to blackpowder to

[Pukin Dog]

Well,
guess I'll just low a few with 20 and 22gr and a few with 28 and 30gr and see what happens with both projectiles.

I don't need perfect, just something better than 3 or 4" low.

Dang, I sure don't want to get a reputation as a gamer though

[Silver Creek Slim]

Pukin "Gamer" Dog 

Slim

[Delmonico]

Does that mean when I go deer huntin' I'm a gamer cause I want ta make my rifle hit where I point.   That don't make ya a gammer in my book, whishin' ya could put some ugly lectronic sight on it while shootin' loads that are below any tested data makes ya one in my book. 

Even more when winnin' is more important than havein' fun ya might as well stay at home and watch mindless shows on the TV.

[Pukin Dog]

I'm just thinking dropping to 20gr in a 45LC is pretty gamey!  LOL  Maybe I should not be a "girlie man" and file the dang sights down

On the other hand, looks like I need to up the powder on the PRS to a more respectable 30gr or so.  That's probably a better option.  Since they are R&D cylinder, I really don't want to put a "warthog" load in them.

[Silver Creek Slim]

Oh, come on. I bet ya can get 35 gr of FFg in there if ya try. 

Slim

[J.D. Stawker]

I've seen cases when more powder meant lower points of aim. That was because velocity increased at a faster rate than recoil. Anyway faster velocity meant less barrel time which led to lower impact.

[Silver Creek Slim]

It will be interesting to see the results of his experiment. Hint, hint. 

Slim

[Tangle Eye]

We got this guy that shoots in one of the clubs I shoot at that was tickled to death when he figgered out how to get 40 grains of black (don't know the granulation) in a .45 Colt case!  I don't know where he hits.  It may not matter since the concussion is enough to make the target "clang" all by themselves!!!! 

Pukin Dog - I use 20 grains of FFg with a grits filler behind my 250 grain PRS loads.  They shoot pretty much where I point with my 58s with the R&D cylinder. They shoot good in the 1875 Remmies to.  I used to shoot the big boomey full house loads in the pistol but decided I could have more fun with some more "moderate" loads.  I tried the round ball too but didn't have much luck with that - probably didn't spend enough time messing with it.  I love them PRS bullets though - nice and clean.

[Dick Dastardly]

Ho PD,

FWIW, my ROA shoots to the same point of impact with the original C&B cylinder loaded up full with FFFg behind a LEE 200 grain conical as it does wtih the Kirst Konverter cylinder stoked up with 45 Colt with a compressed load of FFFg under a well lubed PRS bullet.  The only difference is that the ROA/Kirst rig shoots with EXTREME precision.

They both hit the same POA, but the groups with the ROA/Kirst are frequently touching while the same gun with the original cylinder just ain't as accurate.  Some of that could be the advantage of the PRS bullet.  I even tried to shoot the PRS in the C&B cylinder by loadin' 'em in backwards.  Didn't shoot well at all.

My Son in Law has an Old Army with a Kirst Konverter and his results are same as mine.  That cylinder makes a fine accurate gun all the more accurate.  Both of us are takin' 'em deer hunting this comming weekend.

DD-DLoS