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Question regarding rebore and rechamber of 300 WinMag BLR
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Picture of Grenadier
posted
Question - Is there a SAAMI cartridge .338 to .375 that I can have a 300 WinMag rebored and rechambered for and can be done without setting back the barrel? It must work with the 300 WinMag bolt face and overall length.

I've been looking at all sorts of cartridge and chamber diagrams but they only help so much. Apparently, 338 Win Mag and 358 Norma will not work. Haven't been able to determine if 375 Ruger will.




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Posts: 10900 | Location: North of the Columbia | Registered: 28 April 2008Reply With Quote
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Picture of Mike_Dettorre
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Here is a link to a 375 Ruger

https://www.gunlistings.org/no...ing_blr_in_375_ruger

Why do you believe a 338 Win Mag won't work?


Mike

Legistine actu? Quid scripsi?

Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue.




What I have learned on AR, since 2001:
1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken.
2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps.
3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges.
4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down.
5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine.
6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle.
7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions.
8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA.
9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not.
10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact.
11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores.
12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence.
13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances.
 
Posts: 10160 | Location: Loving retirement in Boise, ID | Registered: 16 December 2003Reply With Quote
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.338 is .155 shorter to the shoulder. Have to set back a thread to work.

The .375 Ruger will be real close. Shoulder is shorter, but bigger at shoulder, so will help that bit. Also, sharper angle by 5 degrees. I'm inclined to think it will work safely, but shoulder and neck junction on fired brass might be just a bit deformed as the reamer won't quite clean it up right. Would be a bubba rechambering, not a by the book one.

If you reload (I know you said SAAMI) the .338-300 win mag would be an easy answer. It just uses the longer base to shoulder dimension of the .300 win, and necks up to .338. Gives a 5% increase or so in capacity over the 338 win mag. You just neck the brass up to .338 and fire form the cartridge.
 
Posts: 1120 | Location: Eastern Oregon | Registered: 02 December 2007Reply With Quote
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Picture of Mike_Dettorre
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Dave,

Thanks for a thoughtful answer.


Mike

Legistine actu? Quid scripsi?

Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue.




What I have learned on AR, since 2001:
1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken.
2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps.
3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges.
4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down.
5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine.
6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle.
7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions.
8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA.
9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not.
10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact.
11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores.
12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence.
13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances.
 
Posts: 10160 | Location: Loving retirement in Boise, ID | Registered: 16 December 2003Reply With Quote
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Thank you both.

Based on what was said about the .375 Ruger I guess a .416 Ruger would make the difference. I hadn't considered it because I'm not sure reboring the barrel with that large a caliber would be feasible or whether the BLR stock could handle the .416's recoil.




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Posts: 10900 | Location: North of the Columbia | Registered: 28 April 2008Reply With Quote
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Might look at .330 Dakota? I am not sure of where the shoulder falls. Also there is a wildcat .338-.300 Win. which is just the .300 opened up to .338.
C.G.B.
 
Posts: 1103 | Registered: 25 January 2005Reply With Quote
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I had an error in my original drawing. The comparative shoulder angles didn't look right, and I found the drawing I had used from the net was wrong, so redrew using SAAMI for 375 Ruger. My apologies for the error.

My original thought was right, it will leave a slightly odd chamber at the shoulder/neck junction. Adding correct picture below:


Got me curious, so I drew it. 375 ruger will barely clean up 300 win mag. So, might be a clean rechamber, depending on the original chamber, of course.
 
Posts: 1120 | Location: Eastern Oregon | Registered: 02 December 2007Reply With Quote
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What about the belt on the 300 ?
 
Posts: 59 | Location: anchorage | Registered: 01 October 2008Reply With Quote
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quote:
Originally posted by robert lerner:
What about the belt on the 300 ?

Same Diameter as 375 ruger case.
 
Posts: 1120 | Location: Eastern Oregon | Registered: 02 December 2007Reply With Quote
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I had an error in my original drawing of the 375 ruger, due to using dimensions that I found posted that probably were from a fired case. Shoulder angle looked wrong, so I redrew with SAAMI dim's. Edited post above and changed drawing.
 
Posts: 1120 | Location: Eastern Oregon | Registered: 02 December 2007Reply With Quote
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Added the 416 Ruger in blue, per your request:
 
Posts: 1120 | Location: Eastern Oregon | Registered: 02 December 2007Reply With Quote
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Thank you very, very much. That looks doable, at least as far as the chamber goes.




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Posts: 10900 | Location: North of the Columbia | Registered: 28 April 2008Reply With Quote
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