Old February 27th, 2021, 08:49 AM #111
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Quote:
Originally Posted by Biggfoot44 View Post
I have a large mental database of accuracy testing DA Revolvers , up to and including very high round counts that would make an armorer blanche .

Cutting to the chase , the all inclusive global accuracy median for S&W's is aprox 1.5 inch @ 25yds , with most falling within 1.25 to 1.75 ( with ammunition of known accuracy ) .

A S&W that did 2.5 to 3.0 inches ( with ammunition of known accuracy ) would have some blatant defect(s) , ie buggered crown or disgusting forcing cone .

FWIW - Simply being very worn with lots of play and slow timing , but absent crown damage , will still do sub 2.0 in .( As long as you cycle with enough vigor to lock up with inertia .)

[ Being more of a mere mortal than John from Md , I made my catagory cut off at 1.0in and under . The difference between any given group between one hole and 3/4 in c to c is as likely to be Me as the gun & ammo . ]


What's Ammunition of Known Accuracy ?

Back when I was loading a bunch of it , I knew the expectations of 158 commercial cast, 3.2gr 231 , and CCI Std primer . ( 1.0in or less in gun of consummate accuracy potential .)

For factory loads , or loads new to you , is two step process . First use a gun of known accuracy capability to test the ammo . Then test that ammo in gun being tested and compare .

Starting from scratch with unknown gun and random ammo ( aka double variable equation ) is random crap shooting .

Thank you for recognizing my place in life.

Your system is sound and gives a good starting point otherwise, as you say, it's a crap shoot which no one can afford today.
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Old February 27th, 2021, 09:18 AM #112
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Working on Pistol Load Accuracy

Bigfoot ,that is sound advice and Iíve done that with an AR and Bolt guns using Federal Gold Metal Match but I have 2 problems of ammo availability (can you link me to buy a box of ammo of known accuracy that is actually in stock)? Plus I donít have another revolver to test.

If making a known good load can be done with purchased Bullets Iíd need to know who has that and the recommended OAL with the 3.2gr w231 which I have.

Thx


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Old February 27th, 2021, 08:31 PM #113
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Whatever the COL comes out when crimped in the crimp groove .
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