| Posted: Thu Oct 29th, 2009 06:12 PM |
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countryboy
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i have a unfailing want to take my .300 rsaum and neck it down to 6.5mm.
i know a lot of yall have in depth experience dealing with this ordeal, so i would love some input on velocity potential with bullets up to 130gr. and also maybe some load starters for later.
thanks, countryboy
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| Posted: Fri Oct 30th, 2009 02:44 AM |
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deerdog
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The Rem short mag has about 8% gain capacity over the 30-06. The 6.5 Rem mag has about the same capacity as the 06. You would not be too far off the heels of the 264 Win mag; most likely a duplicate of the old wildcat 6.5 x 61. I have no experience with this wildcat. I have been a devoted 6.5 Rem mag user since the early 70's. Your idea is a good one and has probably been done by someone. Wish I could be more helpful. Good Luck and Good shooting.
Deerdog
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| Posted: Fri Oct 30th, 2009 04:56 PM |
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countryboy
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thanks deer dog. would the bullet weights i would like to do be suitable for this case capacity?
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| Posted: Fri Oct 30th, 2009 06:00 PM |
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Offfhand
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Countryboy, a wildcat cartridge project is always interesting and exciting, I've been designing and building them for many years. Sometimes with gratifying results and sometimes not. Before begining on a project such as your proposal to neck the .300 RemSAUM to 6.5, first consider the options and possible disadvantages you may encounter. For example, why begin with the .300 SAUM case? It would be wiser to begin with the 7mmSAUm. It's essentially the same case, but has a smaller neck, thus making easier to neck down to 6.5, In other words its a simpler route to where you want to go. But what about the disadvantages? To begin with you're pretty much limited to a single brand of brass. Will there always be an easy supply, and what about the quality? Here your options are limited, unless you want to form brass from another caliber, which in my experience usually isn't worth the trouble. And if you proceed with your 6.5/SAUM program, will the results be significantly different from existing and very similar wildcats? Consider, for example, the 6.5 Leopard cartrtridge designed and written about by Jim Carmichael. What he did was neck down the .300 WSM to 6.5. Also called the 6.5/300WSM. Carmichel recommended using .270WSM cases because they neck down easier, as I suggest above with 7mmSAUM. If you compare data, the already exsisting 6.5 Leopard will be quite similiar, both physically and ballistically to the 6.5/SAUM you propose, but has the greater advantage of brass being available from different makers, meaning you have a selection. Also, 6.5 Leopard (6.5/300WSM)loading dies are already available and there is plenty of reliable loading data already available. Plus the fact that it is used successfully by a good many long range target shooters and hunters, meaning it is a proven performer. So why try to reinvent the wheel when an almost identical wildcat already exists? These comments are not meant to discourage you, only to point out some factors that are often overlooked by first time wildcatters. I've been there, more times than once. But if you continue with your plan, best of luck to you and keep us posted on your progress. Who knows, you may come up with something really new and different.
Shoot well, safely, and often...
Offfhand
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| Posted: Fri Oct 30th, 2009 06:39 PM |
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deerdog
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Offhand has some pretty good advice there. As for your question about bullet weight, my personal preference has always been 120 grains. I have tried about everything out there and keep going back. The Rem Core-Lokt is a dandy, and pressures tend to not move around (jump as quick) as much as with the 140's. Sectional density is high with the 6.5 bore, so penetration is rarely an issue.
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| Posted: Sat Oct 31st, 2009 04:36 PM |
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countryboy
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that helps out a lot. the main reason i was going to be using .300 SAUM cases was the rifle i have that i want to convert is chambered in .300 SAUM. i knew balisticaly that this round would be similar to the 6.5 leopard but i wanted something a lil different. now answer me this, in order to do this round if i go thru with it, would i just need to rebarrel by a competent smith?
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| Posted: Sat Oct 31st, 2009 05:21 PM |
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Rockydog
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Yes, but bear in mind that there may not be a 6.5 reamer out there. If so you will have to have one made which can be a little pricey. Also take into account that you will probably need to have a set of custom dies built. More $$$$ You are probably better off getting it rebarrelled to a wildcat that someone else has already done, unless you won't be content without building the 6.5 Countryboy Magnum.  RD
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| Posted: Sat Oct 31st, 2009 05:26 PM |
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countryboy
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have u got any ideas as to what can be done rocky?
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| Posted: Sat Oct 31st, 2009 06:00 PM |
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Rockydog
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Countryboy, I've always had the want for a wildcat myself. I thought about changing my 8mm mauser to an 8mm-06 or Ackley Improving my .270 or .223. These would all be pretty cheaply done. I did buy a semi wildcat last year. A 6mm TCU Rifle barrel for my Contender. It's a great shooter but was a PIA to begin with. Sizing and fireforming the brass was a challenge as I set the shoulder back too far on a batch of cases and had head separations. Then the extreme straight walls on the fireformed cases caused a bunch of cases to stick in the die, until I changed the lubing process I'd been using for years. The reward is that it shoots really well and kills prairie dogs in the next county with no recoil. Dies etc. are readily available too. If you've never had a wildcat before I'd recommend leaving your Saum the way it is for now and putting the same money you'd spend on the conversion into another gun in semi wildcat like a 7-30 waters, a 6mm or 7mm TCU, or any Ackley Improved Cartridge. Get a feel for reforming/fireforming brass and learn the ropes first. (understand please that I don't know your level of experience with that stuff now)Face it. Once you build that 6.5 SAUM and get the dies etc., and then decide this fireforming etc is more trouble than it's worth, the 6.5 is not going to exactly be a marketable commodity. The number of guys out here with the dedication to mess with wildcats is pretty small even on a board this size. In fact you'll more than likely get less $$$ for it than you would for your .300 SAUM in it's present condition. Just my thoughts since you asked. I'm not trying to dash your hopes or project just being practical. My wife thinks that practicality is my biggest fault. RD
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countryboy
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ok, well thank you
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