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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Just ordered a Rock Creek barrel
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<blockquote data-quote="Jon A" data-source="post: 133768" data-attributes="member: 319"><p>[ QUOTE ]</p><p>John A,</p><p>What sort of velocity difference have you seen between the 265 ULD RBBT and the 290 ULD RBBT? </p><p></p><p>[/ QUOTE ]</p><p>Figure about 150 fps more for the 265 at the same pressures. I shot them both yesterday and they averaged 138 fps faster but the 290 load seemed just a bit hotter. Also the new 265's I'll try next will be shorter.</p><p></p><p>Here were the loads:</p><p></p><p>265 RBBT Bonded, 98 gr US869, Fed 215, Nos Brass, 3.6" OAL: 2827 fps </p><p></p><p>290 RBBT, 95 gr US 869, Fed 215, Nos Brass, 3.6" OAL: 2689 fps</p><p></p><p>Again, that's from a 26.7" long standard 300 RUM. Temp, 43 degrees.</p><p></p><p>In addition to the extra length, these weren't quite as slippery as the flat base 290's I tested earlier. There was slight extraction resistance on a couple of shots with each bullet indicating those loads need to be backed down a couple of grains. I'd expect a 30" barrel to give a good 100 fps more than mine at least.</p><p></p><p>The other news is these bullets turned out to be too long for my 1:9 twist. The 265's built on the shorter jacket should work for me so I'll try them next. I would expect a 1:8.3 to work fine for the 290's, but my 1:9 just can't handle them.</p></blockquote><p></p>
[QUOTE="Jon A, post: 133768, member: 319"] [ QUOTE ] John A, What sort of velocity difference have you seen between the 265 ULD RBBT and the 290 ULD RBBT? [/ QUOTE ] Figure about 150 fps more for the 265 at the same pressures. I shot them both yesterday and they averaged 138 fps faster but the 290 load seemed just a bit hotter. Also the new 265's I'll try next will be shorter. Here were the loads: 265 RBBT Bonded, 98 gr US869, Fed 215, Nos Brass, 3.6" OAL: 2827 fps 290 RBBT, 95 gr US 869, Fed 215, Nos Brass, 3.6" OAL: 2689 fps Again, that's from a 26.7" long standard 300 RUM. Temp, 43 degrees. In addition to the extra length, these weren't quite as slippery as the flat base 290's I tested earlier. There was slight extraction resistance on a couple of shots with each bullet indicating those loads need to be backed down a couple of grains. I'd expect a 30" barrel to give a good 100 fps more than mine at least. The other news is these bullets turned out to be too long for my 1:9 twist. The 265's built on the shorter jacket should work for me so I'll try them next. I would expect a 1:8.3 to work fine for the 290's, but my 1:9 just can't handle them. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Just ordered a Rock Creek barrel
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