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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm/378 Weatherby 35 degree shoulder
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<blockquote data-quote="NZ Longranger" data-source="post: 506841" data-attributes="member: 14"><p>We have actually built and tested a 7mm/416 Rigby improved, and it is definitely too much capacity in the 7mm bore. We actually lost velocity compared to our full length version of the 7mm Fatso we call the 7mm SuperFatso (basically the same capacity as Kirby's 7mmAM, both necked down full length 338 Lapua's). From memory the 2.9" 7mm/416 had about a 135gn watercapacity to the base of the neck verses the 2.7" 7mmSuperFatso's low 120's, verses the 7mm RUM's 116 gns. Anyway, as I said, for the same pressure the 7mm/416 produced less velocity than the 7mm SuperFatso. Dan Lilja had this same experience when he did a full length 7mm/378, and he eventually cut it back to a 2.5" version. The 7mm AM/ 7mm SuperFatso is max capacity in 7mm!</p><p>Greg</p></blockquote><p></p>
[QUOTE="NZ Longranger, post: 506841, member: 14"] We have actually built and tested a 7mm/416 Rigby improved, and it is definitely too much capacity in the 7mm bore. We actually lost velocity compared to our full length version of the 7mm Fatso we call the 7mm SuperFatso (basically the same capacity as Kirby's 7mmAM, both necked down full length 338 Lapua's). From memory the 2.9" 7mm/416 had about a 135gn watercapacity to the base of the neck verses the 2.7" 7mmSuperFatso's low 120's, verses the 7mm RUM's 116 gns. Anyway, as I said, for the same pressure the 7mm/416 produced less velocity than the 7mm SuperFatso. Dan Lilja had this same experience when he did a full length 7mm/378, and he eventually cut it back to a 2.5" version. The 7mm AM/ 7mm SuperFatso is max capacity in 7mm! Greg [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm/378 Weatherby 35 degree shoulder
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