.40 Caliber BPCR Accuracy

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TexasMac
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.40 Caliber BPCR Accuracy

Post by TexasMac »

Those of you that shoot a .40 caliber BPCR may be interested in the article I just posted titled, “.40 Caliber BPCR Accuracy – Twist Rate vs. Bullet Length vs. Velocity”. It can be accessed at the following link:
http://www.texas-mac.com/40_Caliber_BPC ... ocity.html

Wayne
NRA Life (Benefactor & President's Council) Member, TSRA Life Member, NSSF Member, Author & Publisher of the Browning BPCR book
http://www.texas-mac.com
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desert deuce
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Re: .40 Caliber BPCR Accuracy

Post by desert deuce »

Thank you for sharing Wayne.
Sometimes you get the chicken, and sometimes you get the feathers!
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kenny s
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Re: .40 Caliber BPCR Accuracy

Post by kenny s »

printing it now. thanks...Ken
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Lumpy Grits
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Re: .40 Caliber BPCR Accuracy

Post by Lumpy Grits »

Wayne-Have you tried other alloys in the 40?
What lube did you use?
Great information, and thank you :!:
Gary
"Hav'n you along, is like loose'n two good men"
TexasMac
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Re: .40 Caliber BPCR Accuracy

Post by TexasMac »

Lumpy Grits wrote: Wed Jun 19, 2019 2:28 pm Wayne-Have you tried other alloys in the 40?
What lube did you use?
Great information, and thank you :!:
Gary
Gary,

I've tried 30:1, 25:1, 20:1 and down to15:1 with many other alloy mixes in between. I mix my own lead/tin alloy and have a high precision laboratory scale to measure the specific gravity of the alloy to determine the actual mix. For the last couple of years I've stuck with 16:1 with "Money Bullet" designs

Concerning lubes, I started with standard SPG and eventually moved to White Lightning a few years ago. I still have a good bit of WL left and plan to eventually switch to DGL when the WL runs out.

Wayne
NRA Life (Benefactor & President's Council) Member, TSRA Life Member, NSSF Member, Author & Publisher of the Browning BPCR book
http://www.texas-mac.com
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Lumpy Grits
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Re: .40 Caliber BPCR Accuracy

Post by Lumpy Grits »

Thanks Wayne :!:
Really do enjoy your articles.
G,
"Hav'n you along, is like loose'n two good men"
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kenny s
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Re: .40 Caliber BPCR Accuracy

Post by kenny s »

OK. what mix using 415 and 365 PP bullets? The 415 grain is .393 bore wrapped to .400 and the .365 is two stage. .400 up front and 408 to the rear when wrapped with 9 lb. BA paper

and...what powder...1 1/2 or 2fg?
Swiss or OE.? using OE now.

My 40 70 SS seems to like 1 1/2. tried 2f, but it's not cleaner and groups 'seem' to be a little larger...
getting sub 2 inch at 100 and some 1 1/2 inch or less.

went from solid rest to CAS bench rest wood rest sticks. much tighter groups. barrel has been 'sounded' and marked at dead spot.
Ken
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Lumpy Grits
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Re: .40 Caliber BPCR Accuracy

Post by Lumpy Grits »

Kenny-be sure the back of the forearm has no contact with the rec'r.
Gary
"Hav'n you along, is like loose'n two good men"
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kenny s
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Re: .40 Caliber BPCR Accuracy

Post by kenny s »

first thing I did Grumpy. good to mention though...

and I 'rang' the barrel to get the dead spot, which is about 5 inches from the muzzle
Ken
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