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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
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 Posted: Fri Mar 25, 2005 10:17 pm Post subject: .30-30 to .307Win conversion? |
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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
Super Red Neck Member
Joined: Jan 26, 2005
Posts: 2965
Location: Maryland
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| Posted: Sat Mar 26, 2005 7:24 am Post subject: Re: .30-30 to .307Win conversion? |
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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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Joined: Mar 05, 2005
Posts: 208
Location: Franktown, CO
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| Posted: Sat Mar 26, 2005 3:13 pm Post subject: Re: .30-30 to .307Win conversion? |
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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
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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 20â€
.300 Savage 125 3030 AA2015BR Nosler 5th 24â€
.30-30AI 130 2385 W748 Cartridges of the World #9
.30-30 130 2433 AA2520 Speer #12 20â€
.30-30 130 2496 35,700 CUP Varget Hodgdon Annual Manual 2004 24â€
.307 Win 130 2762 H4895 Cartridges of the World #9 (Hodgdon)
.300 Savage 130 2795 VV N140 Speer #12 20â€
.300 Savage 130 2837 H4198 Hodgdon Annual Manual 2004 22â€
.307 Win 130 2891 BL-C(2) Speer #12 20â€
.300 Savage 130 2943 45,600 CUP Varget Lyman 48th 22"
.300 Savage 130 2945 H4895 Barnes #3 24â€
.300 Savage 130 3000 VV N135 Hornady 5th 22â€
.30-30 150 2238 W748 Speer #12 20â€
.30-30AI 150 2270 Re7 Cartridges of the World #9
.30-30 150 2300 BL-C(2) Hornady 5th 20â€
.30-30 150 2310 36,000 CUP W748 WW Components Catalog, 2001
.30-30 150 2317 AA2520 Barnes #3 20â€
.30-30 150 2382 38,000 CUP H335 Lyman 48th 24"
.30-30 150 2390 36,700 CUP H4895 Hodgdon Annual Manual 2004 24â€
.30-30 150 2450 40,600 PSI Re15 Alliant Reloaders Guide, 2002
.300 Savage 150 2574 BL-C(2) Hodgdon Annual Manual 2004 22â€
.307 Win 150 2600 W748 Hornady 5th 20â€
.300 Savage 150 2601 VV N140 Nosler 5th 24â€
.307 Win 150 2603 W748 Speer #12 20â€
.307 Win 150 2604 H4895 Hodgdon Annual Manual 2004 20â€
.30-30AI 150 2617 IMR3031 Cartridges of the World #9
.300 Savage 150 2663 VV N140 Speer #12 20â€
.307 Win 150 2693 45,500 CUP AA2520 Accurate Loading Guide #1
.300 Savage 150 2735 IMR 4064 Barnes #3 24â€
.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 22â€
.300 Savage 165 2341 H4895 Hodgdon Annual Manual 2004 22â€
.300 Savage 165 2492 VV N140 Nosler 5th 24â€
.300 Savage 165 2600 H4895 Hornady 5th 22â€
.300 Savage 165 2600 H4895 Barnes #3 24â€
.300 Savage 165 2614 Re15 Speer #12 20â€
.30-30 170 2100 BL-C(2) Hornady 5th 20â€
.30-30 170 2118 W748 Speer #12 20â€
.30-30 170 2145 36,000 CUP W748 WW Components Catalog, 2001
.30-30 170 2192 IMR4320 Nosler 5th 20â€
.30-30 170 2227 34,700 CUP BL-C(2) Hodgdon Annual Manual 2004 24â€
.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 20â€
.300 Savage 170 2500 H4895 Hornady 5th 22â€
.307 Win 170 2500 IMR4064 Hornady 5th 20â€
.307 Win 170 2535 BL-C(2) Hodgdon Annual Manual 2004 20â€
.307 Win 170 2570 49,300 CUP AA2520 Accurate Loading Guide #1
.300 Savage 180 2130 H4895 Hodgdon Annual Manual 2004 22â€
.300 Savage 180 2400 H4895 Hornady 5th 22â€
.300 Savage 180 2431 H4895 Barnes #3 24â€
.300 Savage 180 2469 Re15 Speer #12 20â€
.300 Savage 180 2500 44,100 CUP Varget Lyman 48th 22"
.300 Savage 180 2502 A2015BR Nosler 5th 24â€
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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 24â€
.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 22â€
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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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Coyote Hunter
NRA, GOA, DAD |
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