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HG
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Sub Sonic Loads
Nov 21st, 2019 at 6:33pm
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Is anyone shooting sub-sonic loads in 32-40 (or other cartridges) with good results or was that a passing fad back 20 years ago?

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Re: Sub Sonic Loads
Reply #1 - Nov 22nd, 2019 at 6:40am
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Sub sonic is required in the Conestoga clubs Southampton PA winter gallery matches. At 25 yards offhand scores are nearly identical to .22 LR. This with larger CF bullets having a scoring disadvantage. Leaded edge vs .22 center hole.

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art_ruggiero
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Re: Sub Sonic Loads
Reply #2 - Nov 22nd, 2019 at 8:53am
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boats  any suggestions on sub loads for 32/40?   art
  
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HG
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Re: Sub Sonic Loads
Reply #3 - Nov 22nd, 2019 at 7:52pm
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I brought this up after reading what Wayne Shwartz had written about his brief experiance with sub-sonic loads in chapter 17 A of The Modern Schuetzen Rifle. He left that chapter with an implied success and more testing to follow. Thats from 1992-1993 time frame. Was just wondering if this went anywhere. Sounds intriguing, think I will try some. Would really like to hear from shooters who may have tried sub-sonic loads.

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Cbashooter
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Re: Sub Sonic Loads
Reply #4 - Nov 22nd, 2019 at 8:31pm
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7.62x39 in a ruger #1.4.5g of bullseye 215g bullet at 940 fps.shoots at times MOA but seldom over 2 MOA.the "problem" is the drop is 42" at 200 from a 100 yard zero.
  
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Re: Sub Sonic Loadsnic
Reply #5 - Nov 23rd, 2019 at 8:50am
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Sub sonic bench rest for group at full distance I don’t know anything about.

Best piece on sub sonic for gallery was written by Paul Shuttleworth for “The Single Shot Exchange”. 20 odd years ago. Real detail with testing. Old loading manuals too. Sharpes “Complete Guide to Handloading pre WW2 & even older Mattens book.

Way I did it was simple . Rule was sub sonic match offhand at 50 feet, needed .22 LR equal accuracy.

I used a 115 G 32/20 bullet sized to suit my 32/40 barrel. Used Unique thrown out of a fixed rotor Bonanza Pistol measure. Loaded a few up with Sharpes data & listened for the super sonic “crack” then switched rotors dropping charges until the  crack went away. 

Satisfied it was sub sonic and fit match rules went to bench rest on the ASSRA gallery target. Switched barrels on my CPA to .22 RF and shot another target bench. First try it printed fine. No measuring no chronograph no weighing powder charges, think it was 4.5 Unique can’t say sure . Actual matches scores about the same as with the RF barrel.

Don’t load it any more easier to just use the .22 barrel when practicing.  Still have some bullets & may take sub sonic loads up to Pennsylvania for gallery this winter . 

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jlmurphy
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Re: Sub Sonic Loads
Reply #6 - Nov 27th, 2019 at 6:42pm
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I played with sub sonic loads for Silhouette for awhile, trying to beat the wind. We actually fired fast and slow loads one afternoon in a steady crosswind, same rifle, same bullet, different charges, the faster loads had noticeably more drift. The problem was variation in vertical was more pronounced, and movement of the rifle was an issue as the lock time was slower. There may be a happy medium, but I never found it.
John
  
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JLouis
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Re: Sub Sonic Loads
Reply #7 - Nov 27th, 2019 at 7:46pm
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Myself I haven't had any success with using them. But on the other hand I watched Bernie Harrell do some outstanding shooting at the 2006 CBA National event while I was competing with and against him. Still believe he has some CBA records that have still yet to be bettered and if memory serves me right he was shoot a 32 Miller Short or something of like kind in the Plainbase class over the years.
  

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HG
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Re: Sub Sonic Loads
Reply #8 - Nov 28th, 2019 at 1:37pm
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Thanks for the replies. I will post results if I find time to do a little testing on my on.

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JLouis
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Re: Sub Sonic Loads
Reply #9 - Nov 28th, 2019 at 2:43pm
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You are very welcome and please do report your own results.
  

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Barrabruce
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Re: Sub Sonic Loads
Reply #10 - Dec 6th, 2019 at 7:56am
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I have loaded quite a few subsonic loads in 30-30.
Pb 150’s 308241 with @ 4 grains bulleye is nice 
A 170 fp bore rider works for me if it’s rubbing it’s nose on the bore.
308403 pope bullet works well too.
I aim for about 960 fps.
I have found that bullet hardness of 50/50 ww/Pb or softer works for me
Soft lube of 60/40 (according to season) be/vas well filled dipped lubed.
Well formed and annealed cases for bullet seating trimmed to max length.partially necksized only.
If just breach seating as is.
I use bulleye a lot and the right amount of airy Dacron filler with the bullet seated firmly into the lands.

This and good follow through as barrel time is long.
The Dacron takes out a lot of vertical dispersion.
I am no benchrester and neither is my rifle and with a 1" dot on my 4x scope I can regularly keep them a tad over an inch at 100 yards and at 300mtre and a keep them in a hand spand.

Not anything up to others levels but I will try them at 200 some time just for fun.
I do like dropping the pope boolet down the barrel and seating it with a pencil or what ever I can find and chambering a case behind it.
Shoot a decent group or object on the range.
The neighbouring shooter with they new looking jacketed rifle in loudenboomer sometimes gets a  Shocked look when walking past my target group shot off the bench with no fancy rest and even tries to shoot off hand as well sometimes if I’m practicing shooting a 3" dinger.

Don’t know too much and I won’t win matches but it is sure fun for me.
Ha Wink

FYI my 310 cadet with a heeled bullet with a light charge will cut a 1/2" group at 50 yards.
On a good day when I can see front post and target somewhat clearly though peepsights.
And it’s not the rifle usually that lets me down.
« Last Edit: Dec 6th, 2019 at 8:13am by Barrabruce »  
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MartiniBelgian
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Re: Sub Sonic Loads
Reply #11 - Dec 6th, 2019 at 11:26am
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17.9 grs of Swiss 1 1/2Fg behinds the sized Pope 308403 in the 32-20 (30-20 actually).  No sonic boom, so must be subsonic - and accurate.
The bullet is sized to .3085 and semi-breechseated:  bullet 1st, then charged case which will cover the base of the bullet .  If I seat it too far out, I get a hard-to-remove crud ring which also destroys accuracy.
I think the  fully charged small case definitely helps in avoiding vertical.

I haven't chrono'd the load yet, but I presume it will be pretty close to the speed of sound.  And yes, the intention is to try it at 200, even 300.
  
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Re: Sub Sonic Loads
Reply #12 - Dec 6th, 2019 at 3:49pm
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Gert,
Are you using a wad with the semi-breechseating technique?
beltfed/arnie
  
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MartiniBelgian
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Re: Sub Sonic Loads
Reply #13 - Dec 7th, 2019 at 12:53am
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Arnie,
Yes indeed.  I seat the bullet with a plugged case, and I use that same case to set my compression die.  I use a thick card wad.
As I'm shooting a martini prone, I need something to hold the powder when loading the charged case.
  
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