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.30-30 vs .32-40 Accuracy (Read 2528 times)

Otony Full Member Offline Posts: 249 Location: Bandon, Oregon Joined: Jun 5^th, 2021	Re: .30-30 vs .32-40 Accuracy Reply #15 - Feb 4^th, 2025 at 5:53pm	Print Post
	westerner wrote on Feb 4^th, 2025 at 2:57pm: If I ever stick another .32 target rifle together it will be a 8.15X46R. Tough accurate little case and handles BP with ease if one chooses to use blasting powder. Given that I am collecting the parts to build an 8.15x46R, this makes me feel pretty good!

	Otony
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frnkeore Frequent Elocutionist Offline Posts: 7393 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: .30-30 vs .32-40 Accuracy Reply #16 - Feb 4^th, 2025 at 6:06pm	Print Post
	It just so happens, that the 8.15x46 is a shortened 30/30 case, or even a closer parent case match, is a 225 Win, necked up The 8.15x46, is actually right in between the 30 & 32 at .316/.317 groove but, much closer to a 30 cal bore. I like it, too! But I think Joe's talking more like a regular 32 barrel for his build. There are all kinds of cartridges that can work in 30 and 32 cal. There is only .013 difference between 30 and 32 groove diameter. There is a little recoil advantage to the 30 cal if, OH is a major focus. I like a .308, 32/35, much more accurate with BP that 32/40 but, the cases are not easy. A much easier one would be the 30/78. A 1.75 lg, 30/30 case, straight tapered to a 30 neck. The 30 Herrett would also work, neither are traditional but, they came before the Miller or the RKS so, I would call them more tradition than those two. It's not the size of the bullet that matters for accuracy. That has been proved by the number of 250's that the 25 cal has done. I think it's a matter of a well built rifle, front and rear rest and the SHOOTER.

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oneatatime Frequent Elocutionist Offline Posts: 4004 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: .30-30 vs .32-40 Accuracy Reply #17 - Feb 4^th, 2025 at 6:18pm	Print Post
	I shoot a 30-30 for lever action 200 meter Cowboy Silhouette and have a 32-40 CPA as one of my rifles for 200 meter single shot Cowboy Silhouette. Another rifle for 200 meter single shot Cowboy Silhouette is a highwall in 30-40 Krag.


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Otony Full Member Offline Posts: 249 Location: Bandon, Oregon Joined: Jun 5^th, 2021	Re: .30-30 vs .32-40 Accuracy Reply #18 - Feb 4^th, 2025 at 6:42pm	Print Post
	frnkeore wrote on Feb 4^th, 2025 at 6:06pm: It just so happens, that the 8.15x46 is a shortened 30/30 case, or even a closer parent case match, is a 225 Win, necked up The 8.15x46, is actually right in between the 30 & 32 at .316/.317 groove but, much closer to a 30 cal bore. I like it, too! But I think Joe's talking more like a regular 32 barrel for his build. There are all kinds of cartridges that can work in 30 and 32 cal. There is only .013 difference between 30 and 32 groove diameter. There is a little recoil advantage to the 30 cal if, OH is a major focus. I like a .308, 32/35, much more accurate with BP that 32/40 but, the cases are not easy. A much easier one would be the 30/78. A 1.75 lg, 30/30 case, straight tapered to a 30 neck. The 30 Herrett would also work, neither are traditional but, they came before the Miller or the RKS so, I would call them more tradition than those two. It's not the size of the bullet that matters for accuracy. That has been proved by the number of 250's that the 25 cal has done. I think it's a matter of a well built rifle, front and rear rest and the SHOOTER. As it happens, one of my projects after we complete our move is to have the barrel setback on a Uberti High Wall in .30-30, then rechamber it to .30 Herrett. Seems like a good way to go, capacity wise, as evidenced by the Miller and RKS. The fact that I have 19 different .30 caliber bullet molds to experiment with might just keep me busy for the next decade or so.

	Otony
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westerner Frequent Elocutionist Offline deleted posts and threads record holder. Posts: 11697 Location: Why, out West of course Joined: May 29^th, 2006	Re: .30-30 vs .32-40 Accuracy Reply #19 - Feb 4^th, 2025 at 8:38pm	Print Post
	frnkeore wrote on Feb 4^th, 2025 at 6:06pm: It just so happens, that the 8.15x46 is a shortened 30/30 case, or even a closer parent case match, is a 225 Win, necked up The 8.15x46, is actually right in between the 30 & 32 at .316/.317 groove but, much closer to a 30 cal bore. I like it, too! But I think Joe's talking more like a regular 32 barrel for his build. There are all kinds of cartridges that can work in 30 and 32 cal. There is only .013 difference between 30 and 32 groove diameter. There is a little recoil advantage to the 30 cal if, OH is a major focus. I like a .308, 32/35, much more accurate with BP that 32/40 but, the cases are not easy. A much easier one would be the 30/78. A 1.75 lg, 30/30 case, straight tapered to a 30 neck. The 30 Herrett would also work, neither are traditional but, they came before the Miller or the RKS so, I would call them more tradition than those two. It's not the size of the bullet that matters for accuracy. That has been proved by the number of 250's that the 25 cal has done. I think it's a matter of a well built rifle, front and rear rest and the SHOOTER. My late Original Haenel Aydt is .321 groove diameter.

	A blind squirrel runs into a tree every once in a while.
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Otony Full Member Offline Posts: 249 Location: Bandon, Oregon Joined: Jun 5^th, 2021	Re: .30-30 vs .32-40 Accuracy Reply #20 - Feb 4^th, 2025 at 8:48pm	Print Post
	westerner wrote on Feb 4^th, 2025 at 8:38pm: frnkeore wrote on Feb 4^th, 2025 at 6:06pm: It just so happens, that the 8.15x46 is a shortened 30/30 case, or even a closer parent case match, is a 225 Win, necked up The 8.15x46, is actually right in between the 30 & 32 at .316/.317 groove but, much closer to a 30 cal bore. I like it, too! But I think Joe's talking more like a regular 32 barrel for his build. There are all kinds of cartridges that can work in 30 and 32 cal. There is only .013 difference between 30 and 32 groove diameter. There is a little recoil advantage to the 30 cal if, OH is a major focus. I like a .308, 32/35, much more accurate with BP that 32/40 but, the cases are not easy. A much easier one would be the 30/78. A 1.75 lg, 30/30 case, straight tapered to a 30 neck. The 30 Herrett would also work, neither are traditional but, they came before the Miller or the RKS so, I would call them more tradition than those two. It's not the size of the bullet that matters for accuracy. That has been proved by the number of 250's that the 25 cal has done. I think it's a matter of a well built rifle, front and rear rest and the SHOOTER. My late Original Haenel Aydt is .321 groove diameter. In my reading about the 8.15x46R I’ve seen a lot of different diameters, from essentially .30 caliber all the way up to .326 or more. If there is consistency about the round, it is its inconsistency! I imagine yamoon could comment on that aspect….

	Otony
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frnkeore Frequent Elocutionist Offline Posts: 7393 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: .30-30 vs .32-40 Accuracy Reply #21 - Feb 5^th, 2025 at 3:40am	Print Post
	The CPI barrel standards, for the 8.15x46R are: 7.6mm bore = .2992 8.03 groove = .3161 You can look them up, online. In surveys done on this forum many have a groove of .317, including mine. The bore size is stamped on the underside of the barrel, because it it proofed with the bore, w/o rifling. Mine is marked 7.6mm but, measuring the bore, with gauge pins, it is .303 or 7.67 and many more are that size. That said, there are reports of groove diameters as large as .324 but, most fall .321 or less. At some date, the Germans "normalize" 8.15x46R but, many German gunsmiths didn't adhere it. Additionally, 8.15mm = .32087 but, I believe that was the standard for the bullet size. Not positive though. A little like our 32 cal. It range from .308/9 (Rem 32/40) to as large as .328. Edit: i must amend my groove size. It is .316 and not .317. I confused my base band size with groove size. So, anywhere I say .317 it should be .316.
	« Last Edit: Feb 5^th, 2025 at 1:20pm by frnkeore »
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westerner Frequent Elocutionist Offline deleted posts and threads record holder. Posts: 11697 Location: Why, out West of course Joined: May 29^th, 2006	Re: .30-30 vs .32-40 Accuracy Reply #22 - Feb 5^th, 2025 at 9:21am	Print Post
	My Aydt slugs at .321. My Stahl manufactured in 1891 slugs at .316. I have Jacks old German rifle and the bore slugs at .314. Thinking the Germans normalized the 8.15X46R in 1908.

	A blind squirrel runs into a tree every once in a while.
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Oakdale Junior Member Offline Posts: 65 Location: Maplewood, MN Joined: Jun 7^th, 2017	Re: .30-30 vs .32-40 Accuracy Reply #23 - Feb 8^th, 2025 at 10:58am	Print Post
	Just turned 77. I ordered CPA in Oct.....rolled the dice on .38-55, with a Bartlien barrel. We'll see..... Tom


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beltfed Frequent Elocutionist Offline Posts: 1780 Location: Central Wi Joined: Dec 20^th, 2007	Re: .30-30 vs .32-40 Accuracy Reply #24 - Feb 25^th, 2025 at 4:29pm	Print Post
	Here you go, Kurt Arnie


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Lead Pot Full Member Offline Posts: 141 Joined: Nov 12^th, 2012	Re: .30-30 vs .32-40 Accuracy Reply #25 - Feb 26^th, 2025 at 12:16am	Print Post
	TNX. Arnie, I got things fixed on my end. The young Grand Daughters are a big help :)


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