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Oversize bullet pressure (Read 1767 times)

cheatin_charlie Senior Forum Member Offline Posts: 389 Location: ohio Joined: Jan 10^th, 2009	Oversize bullet pressure Dec 26^th, 2024 at 11:27am	Print Post
	Something I cannot remember reading about but loading lead bullets in a case for a rifle how big over grove size can you go before chamber pressure gets excessive? Or is it a problem? I am not talking about neck of cartridge being over size and not expanding to release the bullet but just bullet being more than the typical 1 or 2 thou. bigger than grove of barrel. Didn't get any Christmas toys to play with so mind is wondering.


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westerner Frequent Elocutionist Offline deleted posts and threads record holder. Posts: 11737 Location: Why, out West of course Joined: May 29^th, 2006	Re: Oversize bullet pressure Reply #1 - Dec 26^th, 2024 at 11:54am	Print Post
	I have used .323 bullets in a .316 bore. Bullets were about 30-1. 8.15X46R with a tapered throat. 13.5 gr 4227, no sign of excessive pressure. Accurate enough for German rifle OH matches. When .316 bullets were used got excessive lead in the bore. Big bullets put an end to the problem.

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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 16885 Location: Oregon Joined: Feb 2^nd, 2009	Re: Oversize bullet pressure Reply #2 - Dec 26^th, 2024 at 12:34pm	Print Post
	I think in most cases if you're shooting fixed ammo you'll run into issues chambering cartridges before you'll run into pressure issues. At least that's what I've discovered.

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rgchristensen Frequent Elocutionist Offline Posts: 1151 Joined: Jan 2^nd, 2014	Re: Oversize bullet pressure Reply #3 - Dec 26^th, 2024 at 1:13pm	Print Post
	cheatin_charlie wrote on Dec 26^th, 2024 at 11:27am: Something I cannot remember reading about but loading lead bullets in a case for a rifle how big over grove size can you go before chamber pressure gets excessive? Or is it a problem? I am not talking about neck of cartridge being over size and not expanding to release the bullet but just bullet being more than the typical 1 or 2 thou. bigger than grove of barrel. Didn't get any Christmas toys to play with so mind is wondering. One of my old Swiss target rifles has a ctg diameter and throat that accommodates a bullet of .328”, whilst the GROOVE diameter of the bore is .299”. Works great -- it’s one of my most accurate rifles. CHRIS


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cheatin_charlie Senior Forum Member Offline Posts: 389 Location: ohio Joined: Jan 10^th, 2009	Re: Oversize bullet pressure Reply #4 - Dec 26^th, 2024 at 4:31pm	Print Post
	Thanks for your replies gentlemen. Charlie


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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 16885 Location: Oregon Joined: Feb 2^nd, 2009	Re: Oversize bullet pressure Reply #5 - Dec 26^th, 2024 at 6:22pm	Print Post
	I have two rifles with groove diameters too large to allow fixed ammo, and most likely built to muzzle load, or breech seat bullets. One is a Hepburn Match B with 34" .32-40 barrel that uses a .328" groove barrel. The other a custom barreled Ballard scheutzen rifle by George C Schoyen in .38-55 with a .385" groove diameter.

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northwoodneil Full Member Offline Posts: 116 Location: Wisconsin Joined: Jul 25^th, 2021	Re: Oversize bullet pressure Reply #6 - Dec 28^th, 2024 at 7:28am	Print Post
	Didn't bother the Spanish when they re-chambered rifles in 43 Spanish to 43 Reformado. Spanish had a .439 bullet Reformado .451.


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Deadeye Bly Frequent Elocutionist Offline Posts: 1095 Location: Stephens City Joined: Feb 25^th, 2011	Re: Oversize bullet pressure Reply #7 - Dec 28^th, 2024 at 9:05am	Print Post
	Have you ever read the story of the guy who chambered a 6.5 Jap for the 30/06 by grinding down the pilot on the reamer. He took it to a gunsmith to get a recoil pad because it kicked too hard. He was actually shooting it.


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rgchristensen Frequent Elocutionist Offline Posts: 1151 Joined: Jan 2^nd, 2014	Re: Oversize bullet pressure Reply #8 - Dec 28^th, 2024 at 10:31am	Print Post
	Deadeye Bly wrote on Dec 28^th, 2024 at 9:05am: Have you ever read the story of the guy who chambered a 6.5 Jap for the 30/06 by grinding down the pilot on the reamer. He took it to a gunsmith to get a recoil pad because it kicked too hard. He was actually shooting it. Been a long time ago, guessing 50-60 years ago. ...... He was led astray by someone having reported converting a 7.7 Jap into a .30-06 and used a 6.5 instead. It may have been reported in RIFLEMAN or some other gun magazine. CHRIS


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calledflyer Frequent Elocutionist Offline Posts: 3728 Joined: Mar 9^th, 2015	Re: Oversize bullet pressure Reply #9 - Dec 28^th, 2024 at 11:53am	Print Post
	about a jillion of the old German Commision rifles (1888) with the .318 bore and one lug on the bolt were fired with later .323 sized ammo. And, that was often steel-core jacket stuff. I know some got a headspace problem from doing it, but I've never heard of one letting go seriously. I had one that came with a full case of that ammo and the guy I got it from only quit shooting because he'd grown too old to take the 'kick' from it any more. Made a great cast bullet rifle after pulling the slugs and using new bullets.


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frnkeore Frequent Elocutionist Offline Posts: 7448 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: Oversize bullet pressure Reply #10 - Dec 28^th, 2024 at 1:10pm	Print Post
	I used to collect the 1888 Commission rifles and have about 7 or 8 of them, including DST sporter and the Turk .324 rebarreled. The Turk's prove they were strong enough for all 8x57 cartridges. While they are old, they are not weak and have two locking lugs. The bore and groove was .311 x .3208 (7.8 x 8.15mm). The early rifles shot a round nose, 224 gr (14.5 gm) that was .3189 (8.1mm). When the S (spitzer) 154 gr (10 gm) bullet came out. It only had a .315 (8mm) long bearing area that started a .324 (8.23mm) and tapered to .3208 (8.15mm) and .055 (1.4mm) of that was a cannelure. So, there wasn't much to swage down, into the rifling of the old barrels.

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calledflyer Frequent Elocutionist Offline Posts: 3728 Joined: Mar 9^th, 2015	Re: Oversize bullet pressure Reply #11 - Dec 29^th, 2024 at 10:12am	Print Post
	They had to be pretty tough rifles to take some of the things they encountered in later days. I guess I misremembered the number of lugs they had. It did shoot pretty well though. Action was smooth operating, bad trigger. I sort of wish I had it still. I do have a few hundred of those old rounds left, though . Can't even find anybody that wants 'em to shoot up and throw away. Berdan primed, and with those steel cored slugs. Happy New Year, Frank.


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frnkeore Frequent Elocutionist Offline Posts: 7448 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: Oversize bullet pressure Reply #12 - Dec 29^th, 2024 at 12:44pm	Print Post
	Happy New Year to you, Pat. I hope this coming one treats you well. Here is my '88 sporter. It's in 300 Savage.

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calledflyer Frequent Elocutionist Offline Posts: 3728 Joined: Mar 9^th, 2015	Re: Oversize bullet pressure Reply #13 - Dec 29^th, 2024 at 2:27pm	Print Post
	nice looking rifle. I like it. I have a pair of 99s in that cartridge- a favorite round. How'd the feeding of the shorter cartridges get addressed in that rifle? Talking about it will probably get us in trouble, but, hey, it's the Holidays!


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frnkeore Frequent Elocutionist Offline Posts: 7448 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: Oversize bullet pressure Reply #14 - Dec 29^th, 2024 at 6:57pm	Print Post
	The builder (have no idea who) got rid of the en block mag stuff and installed a inline magazine (only holds 3 rounds) out of what rifle, I don't know, as I haven't taken it apart.

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