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.30-30 to .307Win conversion?
Discussions related to Guns and Firearms

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Coyote_Hunter_
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Joined: Mar 05, 2005
Posts: 208
Location: Franktown, CO
PostPosted: Fri Mar 25, 2005 10:17 pm    Post subject: .30-30 to .307Win conversion? Reply with quote
Two weeks ago I bought a nice 1989 Marlin .30-30. Still haven't fired it.

The problem is I've always wanted a .307 - spent two years looking for one, then bought a Marlin .375Win when I discoverd MAriln never shipped .307's.

So I'm considering sending this one of to Nonneman's to get it reamed for $75. At that price I'll still only have $300 in it.

There are 3 boxes of .30-30 ammo in the safe, but if I don't use them I can give them to my buddy. (Or better yet, I'll shoot them in his .30-30.)

My intent would be to use .300 Savage load data, as the cases are almost identical (the .307 is ever so slightly larger) because the SAAMI maximum for the .300 Savage is 46,000 CUP versus 52,000 CUP for the .307. That still allows for the following velocities:


.300 Savage, 46,000CUP SAAMI Max Pressure

130g, 3,000fps, Hornady 5th, 22" barrel
150g, 2,800fps, Hornady 5th, 22" barrel
170g, 2,535fps, Hodgdon Annual Manual 2004, 20" barrel

I have pretty much discarded the idea of a .30-30AI rechamber because the .307 will do the same thing at lower pressures or do more at Savage pressures. I'll be doing 99% of my hunting wth a scope.

Thoughts?

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shrpshtrjoe
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Joined: Jan 26, 2005
Posts: 2965
Location: Maryland
PostPosted: Sat Mar 26, 2005 7:24 am    Post subject: Re: .30-30 to .307Win conversion? Reply with quote
Howdy. From What my loading books say the industry maximum average pressure for the 30-30 is 38,000 cup. Now i don't know if the max pressures are given for the case, action or both. I wouldn't think you would want to exceed that mark. The 300 savage pressures are much higher. I would check with a pro on the matter. Hope it works out for ya.

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Coyote_Hunter_
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Location: Franktown, CO
PostPosted: Sat Mar 26, 2005 3:13 pm    Post subject: Re: .30-30 to .307Win conversion? Reply with quote
Joe –

Its true the .30-30 has a SAAMI (industry standard) maximum pressure of 38,000 CUP. Here are a few others for comparison:
Code:: 
28,000 CUP - .45-70 SAAMI
38,000 CUP - .30-30 SAAMI
40,000 CUP - .45-70 load data for Marlins (Hodgdon, Hornady, Barnes
43,500 PSI – 450 Marlin SAAMI
44,000 CUP – 444 Marlin SAAMI
45,000 CUP – 457 Mag (Wild West Guns rechambered Marlin .45-70)
46,000 CUP - .300 Savage SAAMI
52,000 CUP - .356 Win (Marlin 336 ER) SAAMI
52,000 CUP - .375 Win (Marlin 375) SAAMI


The .300 Savage and .307 cases are very nearly identical in size, with the .307 being ever so slightly larger and the .300 Win Mag having a 0.040” advantage in COL. In theory, they should be able to shoot identical bullets to similar velocities at similar pressures. My intent would be to use the .300 Savage load data (46,000 CUP max) as a top load maybe back off a few fps. That should put me in the 44,000 CUP range or less.

My Marlin .45-70 loads have been measured to be right at 40,000 CUP and my .375 Win Marlin loads are around 45,000 CUP. Given the number of 40,000 CUP .45-70’s, 444’s. 450’s, .356’s and .375’s in use – not to mention the .457 Mags - I’m not too concerned about pushing 44,000 CUP in a Marlin of modern (1989) manufacture. I do understand the need for caution, however, and do not intend to get near the .307’s 52,000 CUP SAAMI maximum.

Perusing my load manuals, I created the following spreadsheet:
Code:: 
 
Cartridge          SAAMI Maximums
.30-30              38,000 CUP
.300 Savage         46,000 CUP
.307 Win            52,000 CUP

Cartridge      Weight  Velocity  Pressure       Powder     Data Source                        Barrel
.30-30          125     2626     37,600 CUP     H3335      Lyman 48th                         24"
.30-30          125     2630     34,100 PSI     Re7        Alliant Reloaders Guide, 2002
.307 Win        125     2762                    H4895      Hodgdon Annual Manual 2004         20”
.300 Savage     125     3030                    AA2015BR   Nosler 5th                         24”
                              
.30-30AI        130     2385                    W748       Cartridges of the World #9
.30-30          130     2433                    AA2520     Speer #12                          20”
.30-30          130     2496     35,700 CUP     Varget     Hodgdon Annual Manual 2004         24”
.307 Win        130     2762                    H4895      Cartridges of the World #9 (Hodgdon)
.300 Savage     130     2795                    VV N140    Speer #12                          20”
.300 Savage     130     2837                    H4198      Hodgdon Annual Manual 2004         22”
.307 Win        130     2891                    BL-C(2)    Speer #12                          20”
.300 Savage     130     2943     45,600 CUP     Varget     Lyman 48th                         22"
.300 Savage     130     2945                    H4895      Barnes #3                          24”
.300 Savage     130     3000                    VV N135    Hornady 5th                        22”
                              
.30-30          150     2238                    W748       Speer #12                          20”
.30-30AI        150     2270                    Re7        Cartridges of the World #9
.30-30          150     2300                    BL-C(2)    Hornady 5th                        20”
.30-30          150     2310     36,000 CUP     W748       WW Components Catalog, 2001
.30-30          150     2317                    AA2520     Barnes #3                          20”
.30-30          150     2382     38,000 CUP     H335       Lyman 48th                         24"
.30-30          150     2390     36,700 CUP     H4895      Hodgdon Annual Manual 2004         24”
.30-30          150     2450     40,600 PSI     Re15       Alliant Reloaders Guide, 2002
.300 Savage     150     2574                    BL-C(2)    Hodgdon Annual Manual 2004         22”
.307 Win        150     2600                    W748       Hornady 5th                        20”
.300 Savage     150     2601                    VV N140    Nosler 5th                         24”
.307 Win        150     2603                    W748       Speer #12                          20”
.307 Win        150     2604                    H4895      Hodgdon Annual Manual 2004         20”
.30-30AI        150     2617                    IMR3031    Cartridges of the World #9
.300 Savage     150     2663                    VV N140    Speer #12                          20”
.307 Win        150     2693     45,500 CUP     AA2520     Accurate Loading Guide #1
.300 Savage     150     2735                    IMR 4064   Barnes #3                          24”
.300 Savage     150     2741     44,300 CUP     Varget     Lyman 48th                         22"
.307 Win        150     2760                               Cartridges of the World #9 (Factory load)
.300 Savage     150     2765     43,500 CUP     AA2495BR   Accurate Loading Guide #1
.300 Savage     150     2800                    IMR4064    Hornady 5th                        22”
                              
.300 Savage     165     2341                    H4895      Hodgdon Annual Manual 2004         22”
.300 Savage     165     2492                    VV N140    Nosler 5th                         24”
.300 Savage     165     2600                    H4895      Hornady 5th                        22”
.300 Savage     165     2600                    H4895      Barnes #3                          24”
.300 Savage     165     2614                    Re15       Speer #12                          20”
                              
.30-30          170     2100                    BL-C(2)    Hornady 5th                        20”
.30-30          170     2118                    W748       Speer #12                          20”
.30-30          170     2145     36,000 CUP     W748       WW Components Catalog, 2001
.30-30          170     2192                    IMR4320    Nosler 5th                         20”
.30-30          170     2227     34,700 CUP     BL-C(2)    Hodgdon Annual Manual 2004         24”
.30-30          170     2256     38,000 CUP     BL-C(2)    Lyman 48th                         24"
.30-30AI        170     2310                    IMR3031    Cartridges of the World #9
.30-30          170     2330     40,500 PSI     Re15       Alliant Reloaders Guide, 2002
.307 Win        170     2446                    W748       Speer #12                          20”
.300 Savage     170     2500                    H4895      Hornady 5th                        22”
.307 Win        170     2500                    IMR4064    Hornady 5th                        20”
.307 Win        170     2535                    BL-C(2)    Hodgdon Annual Manual 2004         20”
.307 Win        170     2570     49,300 CUP     AA2520     Accurate Loading Guide #1
                              
.300 Savage     180     2130                    H4895      Hodgdon Annual Manual 2004         22”
.300 Savage     180     2400                    H4895      Hornady 5th                        22”
.300 Savage     180     2431                    H4895      Barnes #3                          24”
.300 Savage     180     2469                    Re15       Speer #12                          20”
.300 Savage     180     2500     44,100 CUP     Varget     Lyman 48th                         22"
.300 Savage     180     2502                    A2015BR    Nosler 5th                         24”

The following loads are of particular interest:
Code:: 
.300 Savage     130     2943     45,600 CUP     Varget     Lyman 48th                         22"
.300 Savage     130     2945                    H4895      Barnes #3                          24”
.300 Savage     150     2741     44,300 CUP     Varget     Lyman 48th                         22"
.300 Savage     150     2765     43,500 CUP     AA2495BR   Accurate Loading Guide #1
.300 Savage     170     2500                    H4895      Hornady 5th                        22”

Regan Nonneman in MO will be doing the conversion if I decide to go that route. He has done quite a few Marlin conversions to .307 and .356Win.

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